WO2007029333A1 - 半導体集積回路 - Google Patents
半導体集積回路 Download PDFInfo
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- WO2007029333A1 WO2007029333A1 PCT/JP2005/016645 JP2005016645W WO2007029333A1 WO 2007029333 A1 WO2007029333 A1 WO 2007029333A1 JP 2005016645 W JP2005016645 W JP 2005016645W WO 2007029333 A1 WO2007029333 A1 WO 2007029333A1
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C7/00—Arrangements for writing information into, or reading information out from, a digital store
- G11C7/10—Input/output [I/O] data interface arrangements, e.g. I/O data control circuits, I/O data buffers
- G11C7/1048—Data bus control circuits, e.g. precharging, presetting, equalising
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C11/21—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements
- G11C11/34—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices
- G11C11/40—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices using transistors
- G11C11/401—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices using transistors forming cells needing refreshing or charge regeneration, i.e. dynamic cells
- G11C11/4063—Auxiliary circuits, e.g. for addressing, decoding, driving, writing, sensing or timing
- G11C11/407—Auxiliary circuits, e.g. for addressing, decoding, driving, writing, sensing or timing for memory cells of the field-effect type
- G11C11/409—Read-write [R-W] circuits
- G11C11/4091—Sense or sense/refresh amplifiers, or associated sense circuitry, e.g. for coupled bit-line precharging, equalising or isolating
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C11/21—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements
- G11C11/34—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices
- G11C11/40—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices using transistors
- G11C11/401—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices using transistors forming cells needing refreshing or charge regeneration, i.e. dynamic cells
- G11C11/4063—Auxiliary circuits, e.g. for addressing, decoding, driving, writing, sensing or timing
- G11C11/407—Auxiliary circuits, e.g. for addressing, decoding, driving, writing, sensing or timing for memory cells of the field-effect type
- G11C11/409—Read-write [R-W] circuits
- G11C11/4093—Input/output [I/O] data interface arrangements, e.g. data buffers
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C11/21—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements
- G11C11/34—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices
- G11C11/40—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices using transistors
- G11C11/401—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices using transistors forming cells needing refreshing or charge regeneration, i.e. dynamic cells
- G11C11/4063—Auxiliary circuits, e.g. for addressing, decoding, driving, writing, sensing or timing
- G11C11/407—Auxiliary circuits, e.g. for addressing, decoding, driving, writing, sensing or timing for memory cells of the field-effect type
- G11C11/409—Read-write [R-W] circuits
- G11C11/4096—Input/output [I/O] data management or control circuits, e.g. reading or writing circuits, I/O drivers or bit-line switches
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C11/21—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements
- G11C11/34—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices
- G11C11/40—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices using transistors
- G11C11/401—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices using transistors forming cells needing refreshing or charge regeneration, i.e. dynamic cells
- G11C11/4063—Auxiliary circuits, e.g. for addressing, decoding, driving, writing, sensing or timing
- G11C11/407—Auxiliary circuits, e.g. for addressing, decoding, driving, writing, sensing or timing for memory cells of the field-effect type
- G11C11/409—Read-write [R-W] circuits
- G11C11/4097—Bit-line organisation, e.g. bit-line layout, folded bit lines
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C7/00—Arrangements for writing information into, or reading information out from, a digital store
- G11C7/02—Arrangements for writing information into, or reading information out from, a digital store with means for avoiding parasitic signals
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C7/00—Arrangements for writing information into, or reading information out from, a digital store
- G11C7/10—Input/output [I/O] data interface arrangements, e.g. I/O data control circuits, I/O data buffers
- G11C7/1051—Data output circuits, e.g. read-out amplifiers, data output buffers, data output registers, data output level conversion circuits
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C7/00—Arrangements for writing information into, or reading information out from, a digital store
- G11C7/10—Input/output [I/O] data interface arrangements, e.g. I/O data control circuits, I/O data buffers
- G11C7/1051—Data output circuits, e.g. read-out amplifiers, data output buffers, data output registers, data output level conversion circuits
- G11C7/1069—I/O lines read out arrangements
Definitions
- the present invention relates to a semiconductor integrated circuit having a differential amplifier that amplifies a voltage difference between data line pairs.
- a semiconductor integrated circuit in a semiconductor memory such as a DRAM, data read from a memory cell is transmitted to one of a bit line pair. At this time, the other of the bit line pair is precharged to the reference voltage. Then, the voltage difference between the bit line pair is amplified by the sense amplifier, and the amplified signal is taken out to read the data.
- Japanese Patent Application Laid-Open Nos. 2000-36194 and 63-42095 describe circuits for precharging the reference-side bit line until immediately before the sense amplifier operates.
- the bit lines are connected to the reference voltage line by switch transistors that operate independently of each other. This prevents the voltage on the reference side bit line from changing due to the coupling capacitance between the bit lines during a read operation. That is, the voltage difference between the bit line pair is prevented from becoming small.
- Patent Document 1 Japanese Patent Laid-Open No. 2000-36194
- Patent Document 2 JP-A 63-42095
- An object of the present invention is to prevent a data read margin from being reduced by a coupling capacitance.
- any one of a pair of data output units each having a complementary data line pair outputs data.
- the data output unit outputs data to any one of the data lines precharged to the reference voltage.
- the amplifier switch connects the data line to the connection wiring.
- the switch controller outputs an amplifier switch control signal for controlling the operation of the amplifier switch.
- the switch control unit is connected to the data line pair of the data output unit that outputs data by an amplifier switch control signal when one of the data output units outputs data to one of the data line pairs. Turn on the pair of amplifier switches. As a result, the data line pair from which data is output is connected to the connection wiring pair.
- the switch control unit outputs data to the data line from which no data is output in the data output unit that does not output data until one of the data output units outputs data and the force differential amplifier starts an amplification operation.
- the connection wiring and the data line through which data is not transmitted are connected to the precharged data line of the data output unit that does not output data, and the load amount increases. Therefore, it is possible to prevent the voltage of the data line and connection wiring through which data is not transmitted from changing due to the coupling capacitance at the time of data output. As a result, it is possible to prevent the voltage difference between the data line pair and the connection wiring pair from becoming small when the differential amplifier starts an amplification operation.
- each data output unit is a memory cell array having a plurality of memory cells.
- Each data line pair is a complementary bit line pair connected to each memory cell.
- the present invention can also be applied to a semiconductor memory in which a differential amplifier is shared by a pair of memory cell arrays.
- the switch control unit is connected to a data line corresponding to a data line in which data is not output in the data output unit that does not output data before the differential amplifier starts an amplification operation. Turn off the connected amplifier switch. Connection wiring that does not output data is set to floating before amplification. Therefore, the differential amplifier can surely differentially amplify the voltage difference between the pair of connection wires.
- a precharge switch is arranged between each data line and a reference voltage line to which a reference voltage is supplied. Then, the switch control unit receives the data line pair of the data output unit that does not output data until one of the data output units outputs data and the force differential amplifier starts an amplification operation in response to the precharge switch control signal. Turn on the pretage switch connected to. As a result, it is possible to precharge the voltage of the data line and the connection line through which data is not transmitted to the reference voltage until immediately before the amplification operation. As a result, it is possible to reliably prevent the voltage of the data line and the connection wiring through which data is not transmitted from changing due to the influence of the force coupling capacitance at the time of data output.
- the equalizing switch connects the data lines of the data line pair to each other.
- the switch control unit outputs an equalize switch control signal for controlling the operation of the equalize switch.
- the switch control unit turns off the equalization switch connected to the data line pair of the data output unit that outputs data by the equalization switch control signal, and the data output unit outputs the data to output the force differential amplifier. Until the amplifier starts the amplification operation, the equalizing switch connected to the data line pair of the data output section that does not output data is turned on.
- connection wiring through which data is not transmitted is connected to both data lines of the data output unit that does not output data. Therefore, greatly reduce the load of connection wiring that does not transmit data. Can be increased. As a result, it is possible to reliably prevent the voltage of the data line and the connection wiring through which data is not transmitted from changing due to the coupling capacitance at the time of data output.
- the data output unit having the complementary data line pair outputs data to any one of the data lines precharged to the reference voltage.
- the capacity switch and the precharge capacity that can be used as a load are arranged in series between each data line and a reference voltage line to which a reference voltage is supplied.
- the switch control unit outputs a switch control signal for controlling the operation of each capacitive switch. Specifically, when the data output unit outputs data to one of the data line pairs, the switch control unit selects a capacitance switch that is turned on corresponding to the data line to which data is output by the switch control signal. Turn off. As a result, the amount of load on the data line to which data is output is reduced, so that the amount of voltage change on the data line that changes in response to data output to the data line can be increased.
- the switch control circuit turns on the capacitance switch corresponding to the data line from which no data is output until the data output unit outputs data and the differential amplifier starts the amplification operation.
- the switch control unit turns on and turns off the capacitance switch corresponding to the data line from which data is not output.
- the differential amplifier starts the amplification operation Turn off.
- the load amount of the data line to which no data is output is reduced before the amplification operation. For this reason, the differential amplifier can reliably amplify the voltage difference between the pair of connection wires.
- the data output unit is a memory cell array having a plurality of memory cells.
- the data line pair is a complementary bit line pair connected to each memory cell.
- the present invention relates to a semiconductor in which a differential amplifier is shared by a pair of memory cell arrays. It can also be applied to memory.
- each memory cell has a memory cell capacity for holding data and a transfer transistor.
- the capacity switch and the precharge capacity are formed by using the transfer transistor and the memory cell capacity of the memory cell.
- the semiconductor integrated circuit has a redundant control circuit.
- the redundancy control circuit uses a memory cell composed of a precharge capacitor that is not used as a load and a capacitor switch connected to the precharge capacitor as a redundant memory cell for relieving a defect.
- the data output unit having the complementary data line pair outputs data to any one of the data lines precharged to the reference voltage.
- the capacity switch and the precharge capacity that can be used as a load are arranged in series between each data line and a reference voltage line to which a reference voltage is supplied.
- the precharge switch is disposed between each data line and a reference voltage line to which a reference voltage is supplied.
- the switch control unit outputs a switch control signal for controlling the operations of the capacitive switch and the precharge switch.
- the differential amplifier is connected to the data line pair and amplifies the voltage difference between the data line pair.
- the switch control unit when the data output unit outputs data to one of the data line pairs, the switch control unit is turned on corresponding to the data line to which data is output by the switch control signal. Turn off the capacitance switch and precharge switch.
- the switch control unit turns off the capacitance switch that is on corresponding to the data line to which no data is output. Then, the precharge switch that is on corresponding to the data line where no data is output is turned off. While the precharge capacitor is connected to the data line where no data is output, the data line load increases.
- the switch control unit turns on the capacitance switch and the precharge switch corresponding to the data line to which data is output, and the data output unit Turn off before outputting data.
- the data line to which data is output is in a floating state and the load amount is reduced, so that the voltage change amount of the data line that changes in response to the data output to the data line can be increased.
- the switch control unit includes a timing change circuit for changing the generation timing of the switch control signal.
- the timing change circuit can evaluate the relationship between the timing of the switch control signal and the effect of coupling noise on the data line. By feeding back the evaluation result to the manufacturing process or design process, a semiconductor integrated circuit having a large data read margin can be configured.
- Preferable U of the second and third embodiments of the present invention in the example, for example, a plurality of capacitive switches are formed for each data line.
- the switch selection circuit sets the number of precharge capacitors used as a load. By changing the number of precharge capacitors connected to the data line, it is possible to optimally adjust the voltage change of the data line when data is output and when the data is differentially amplified. As a result, the data read margin can be improved.
- FIG. 1 is a block diagram showing a first embodiment of the present invention.
- 2 is a timing chart showing a data output operation of the semiconductor integrated circuit shown in FIG. ⁇ 3] It is a block diagram showing a second embodiment of the present invention.
- FIG. 4 is a timing chart showing the data output operation of the semiconductor integrated circuit shown in FIG. [5]
- FIG. 5 is a timing chart showing the data output operation in the third embodiment of the present invention.
- FIG. 6 is a waveform diagram showing a change in voltage of the data line pair in period P1 in FIG.
- FIG. 7 is a block diagram showing a fourth embodiment of the present invention.
- FIG. 8 is a block diagram showing an outline of the memory core unit shown in FIG.
- FIG. 9 is a circuit diagram showing details of the boundary region shown in FIG.
- FIG. 10 is a timing chart showing a read operation of the FCRAM according to the fourth embodiment.
- FIG. 12 A circuit diagram showing a timing change circuit formed in the precharge control circuit shown in FIG.
- FIG. 13 is a block diagram showing a multichip package on which the FCRAM of the fourth embodiment is mounted.
- FIG. 14 is a block diagram showing a fifth embodiment of the present invention.
- 15 is a circuit diagram showing a timing change circuit formed in the precharge control circuit shown in FIG.
- FIG. 16 is a block diagram showing a silicon-on-chip in which the FCRAM of the fifth embodiment is embedded.
- ⁇ 17 It is a block diagram showing a sixth embodiment of the present invention.
- FIG. 18 is a block diagram showing a seventh embodiment of the present invention.
- FIG. 20 is a circuit diagram showing a timing change circuit formed in the precharge control circuit shown in FIG.
- 21 is a circuit diagram showing details of the delay circuit shown in FIG.
- FIG. 22 is a block diagram showing a mode register and a timing change circuit in a ninth embodiment.
- FIG. 23 is a circuit diagram showing details of the delay circuit shown in FIG.
- ⁇ 24 It is a block diagram showing a tenth embodiment of the present invention.
- FIG. 25 is a block diagram showing details of the substrate voltage generation circuit shown in FIG. 24.
- FIG. 26 is a circuit diagram showing a timing changing circuit formed in the precharge control circuit shown in FIG. 24.
- FIG. 28 is a circuit diagram showing a timing change circuit formed in the precharge control circuit shown in FIG. 27.
- FIG. 29 is a block diagram showing a twelfth embodiment of the present invention.
- FIG. 30 is a circuit diagram showing a timing changing circuit formed in the precharge control circuit shown in FIG. 29.
- FIG. 31 is a block diagram showing a thirteenth embodiment of the present invention.
- FIG. 32 is a circuit diagram showing a main part of the memory core shown in FIG. 31.
- FIG. 33 is a timing diagram showing a read operation of the FCRAM of the thirteenth embodiment. ⁇ 34] An explanatory diagram showing a test command sequence of the thirteenth embodiment.
- FIG. 35 is a circuit diagram showing a timing changing circuit formed in the precharge control circuit shown in FIG. 31.
- ⁇ 36 A block diagram showing a fourteenth embodiment of the present invention.
- FIG. 37 is a circuit diagram showing a main part of the memory core shown in FIG. 36.
- FIG. 39 is a block diagram showing a fifteenth embodiment of the present invention.
- FIG. 40 is a circuit diagram showing a main part of the memory core shown in FIG. 39.
- FIG. 41 is a timing diagram showing a read operation of the FCRAM according to the fifteenth embodiment.
- FIG. 42 is a block diagram showing a sixteenth embodiment of the present invention.
- FIG. 43 is a circuit diagram showing a main part of the memory core shown in FIG. 42.
- FIG. 44 is a block diagram showing the main parts of a memory core in a fourteenth embodiment of the present invention.
- Double circles (Fig. 7 etc.) The terminal is shown.
- the signal lines indicated by bold lines are composed of a plurality of lines.
- a part of the block to which the thick line is connected is composed of a plurality of circuits. Use the same symbol as the signal name for the signal line through which the signal is transmitted.
- a signal with “Z ⁇ ” at the beginning indicates negative logic.
- a signal with “z” at the end indicates positive logic.
- FIG. 1 shows a first embodiment of the present invention.
- the semiconductor integrated circuit has a pair of data output units 2L and 2R each having a complementary data line pair DL1ZDL2 and DR1ZDR2, a differential amplifier 4 connected to the connection wiring pair CW1 and CW2, and a switch control unit 6A.
- the data lines DL1-2 and DR1-2 are connected to the connection wiring pair CW1-2 through the amplifier switches ASL1, ASL2, ASR1, and ASR2. That is, the differential amplifier 4 is shared by the data output units 2L and 2R.
- the data lines DL1-2, DR1-2 are connected to the reference voltage line VREF via precharge switches PSL1, PSL2, PSR1, PSR2, respectively.
- the data line pair DL1-2 is connected to each other through the equalize and switch ESL1.
- the pair of data lines DR1-2 are connected to each other via the equalizer and switch ESR1.
- Each switch ASL1-2, ASR1-2, PSL1-2, PSR1-2, ESL1, ESR1 consists of an nMOS transistor and a pMOS transistor.
- One of the data output units 2L and 2R operates, and the data is sent to one of the data line pairs DR1-2.
- the switch control unit 6A includes an amplifier switch control signal for controlling the operations of the amplifier switches ASL1-2 and ASR1-2, a precharge switch control signal for controlling the operations of the precharge switches PSL1-2 and PSR12, Equalize switch control signals that control the operation of the rise switches ESL1 and ESR2 are output to the control signal lines.
- Each control signal line is connected to the gate of the transistor of each switch ASL1-2, ASR1-2, PSL1-2, PSR1-2, ESL1, ESR1.
- the switch control unit 6A turns on the amplifier switch ASR1-2.
- the data line DR1-2 is connected to the differential amplifier 4 via the connection wiring pair CW1-2.
- Differential amplifier 4 has data The voltage difference between the output data line DR1 and the corresponding data line DR2 precharged to the reference voltage is amplified and the amplified data is output.
- data line DL1-2, data output units 2L and 2R, and differential amplifier 4 correspond to a complementary bit line pair, a memory cell array, and a sense amplifier.
- these elements include a complementary data bus line for transferring data amplified by the sense amplifier to the outside, a data bus switch for outputting the data amplified by the sense amplifier to the data bus line, and a data node.
- a read amplifier that amplifies the amount of data on the wire.
- the configuration in Figure 1 can also be applied to logic LSIs.
- FIG. 2 shows a data output operation of the semiconductor integrated circuit shown in FIG.
- data is output from the data line DR1 of the data output unit 2R.
- “ON” indicates that the switch is on
- “OFF” indicates that the switch is off.
- all the switches ASL 1-2, ASR1-2, PSL1-2, PSR1-2, ESR1, ESL1 are on. Therefore, the data lines DL1-2, DR1-2, and the connection wiring pair CW1-2 are precharged to the reference voltage VREF! /.
- the switch control unit 6A Before the data output unit 2R outputs data to the data line DR1, the switch control unit 6A turns off the switches PSR1-2 and ESR1 corresponding to the data line pair DR1-2 to which data is output (FIG. 2 (a)). In addition, before the data output unit 2R outputs data to the data line DR1, the switch control unit 6A is connected to the data line DL1 corresponding to the data line DR1 to which data is output in the data output unit 2L to which data is not output. Turn off the ASL1 switch (Fig. 2 (b)). As a result, the amount of load on the data line DR1 is reduced, so that the amount of voltage change on the data line DR1 that changes in response to the data output to the data line DR1 can be increased.
- connection wiring CW2 and the data line DR2 are connected to the data line DL1 connected only by the data line DL2.
- the load on connection wiring CW2 and data line DR2 increases when data is output. Therefore, connection wiring C
- the voltage force of W2 and data line DR2 can be reliably prevented from changing due to the influence of the coupling capacitance during data output.
- the switch ASR1-2 continues to be turned on during the output operation in order to amplify the voltage difference of the data line pair DR1-2, to which data is output, by the differential amplifier 4 (FIG. 2 (d)).
- the differential amplifier 4 FIG. 2 (d)
- the switch ASL2 on the data output section 2L side corresponding to the data line DR2 is on. Therefore, the data line DR2 is connected to the reference voltage line VREF via the switches AS R2, ASL2, and PSL2. Further, the data line DR2 is connected to the reference voltage line VREF via the switches ASR2, ASL2, ESL1, and PSL1.
- the switch control unit 6A turns off the switch ASL2 on the data output unit 2L side corresponding to the data line DR2 immediately before the differential amplifier 4 starts the amplification operation, when no data is output (FIG. 2 (f )).
- the data line DR2 and the connection wiring CW2 are disconnected from the reference voltage line VREF before the amplification operation and are in a floating state.
- the differential amplifier 4 that operates thereafter can surely differentially amplify the voltage difference between the connection wiring pair CW1, CW2 and the data lines DR1, DR2.
- the differential amplifier 4 can reliably amplify the data output from the data output unit 2R.
- the switch control unit 6A turns on the switches ASL1-2, PSR1-2, and ESR1 (FIG. 2 (g)).
- the data line pair DR1-2 and the connection wiring pair CW1-2 are connected to the reference voltage line VREF and precharged to the reference voltage VREF. Then, the data output operation is completed.
- equalize switches ESL1 and ESL2 for equalizing the data line pairs DL1-2 and DR1-2 shown in FIG. 1 need not be formed.
- the Equalis switch ESL1-2 the data line DR2 to which no data is output is connected to the reference voltage line VREF not only through the data line DL2 but also through the data line DL1 as described in FIG. Can be connected. For this reason, the data line DR2 is powered until the differential amplifier 4 starts operating after the data is output. It is possible to reliably prevent the voltage from changing due to the voltage change of the data line DR1.
- control signal lines are independently wired to switches PSL1-2, ESL1 and switches PSR1-2, ESR1.
- a common control signal line may be wired to switches PSL1-2 and ESL1
- a common control signal line may be wired to switches PSR1-2 and ESR1.
- the data line DR2 and the connection wiring CW2 through which data is not transmitted are connected to the reference voltage line VREF until the differential amplifier 4 starts the amplification operation after the data is output. Therefore, it is possible to prevent the voltage of the data line DR2 and the connection wiring CW2 from changing due to the coupling capacitance of the data line pair DR1-2 and the connection wiring pair CW1-2 at the time of data output.
- the differential amplifier 4 can reliably differentially amplify the voltage difference between the connection wiring pair CW1-2.
- FIG. 3 shows a second embodiment of the present invention.
- the same elements as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
- the semiconductor integrated circuit includes a data output unit 2 having complementary data line pairs Dl and D2, a differential amplifier 4 connected to the data line pair Dl and D2, and a switch control unit 6B.
- This embodiment is different from the first embodiment in that the differential amplifier 4 is not shared and the data lines Dl and D2 are connected to the ground line VSS via the precharge capacitors Cl and C2. To do.
- the data line D1-2 is connected to the reference voltage line VREF via the precharge switches PS1 and PS2, respectively.
- the data line pair D1-2 is connected to each other via the Equalis switch ES1. Further, the data line D1-2 is connected to the ground line VSS via the capacity switch CS1-2 and the precharge capacity C1-2.
- the circuit configuration of each switch PS 1-2, ES1, CS1-2 is the same as that of the switch PSR1-2 etc. of the first embodiment.
- the data output unit 2 outputs data to one of the data line pair D1-2.
- the switch controller 6B is a precharge switch for controlling the operation of the precharge switch PS 1 2 respectively.
- FIG. 4 shows the data output operation of the semiconductor integrated circuit shown in FIG.
- the data output unit 2 outputs data to the data line D1.
- all the switches PS 1-2, ES1, CS 1-2 are turned on.
- the data line D1-2 is precharged to the reference voltage VREF.
- the precharge capacitor C1 2 is connected to each of the data lines D1-2. For this reason, the load capacity of the data line D1-2 is increased by the precharge capacity C1-2.
- the switch control unit 6B turns off the switches PS1-2 and ESl immediately before data is output to the data line D1 (FIG. 4 (a)). In addition, the switch control unit 6B turns off the switch CS1 immediately before data is output to the data line D1 (FIG. 4 (b)).
- the data line D1 is disconnected from the precharge capacitor C1 by turning off the switch CS1. As a result, the load capacitance value of the data line D1 is reduced, and the amount of change in the voltage of the data line D1 due to data output can be increased.
- the switch control unit 6B turns off the switch CS2 immediately before the differential amplifier 4 starts an amplification operation (FIG. 4 (d)). For this reason, the precharge capacitor C2 is disconnected from the data line D2 from which no data is output. Decreasing the load capacitance value of the data line D2 prevents the differential amplifier 4 from reducing the amplification speed of the voltage difference between the data line pair DR1-2. In other words, the differential amplifier 4 can reliably amplify the data output from the data output unit 2.
- the switch control unit 6B turns on the switches PS1-2, ES1, and CSI-2 after the amplification operation of the differential amplifier 4 is completed (FIG. 4 (e)). As a result, the data line pair D1-2 is connected to the reference voltage line VREF and precharged to the reference voltage VREF.
- the equalize switch ES1 may not be formed.
- Switch PS 1-2, Control signal line common to ESI may be wired.
- a precharge switch for example, PS2
- a data line for example, D2
- the data line from which no data is output can be connected to the reference voltage line VREF until the differential amplifier 4 starts operating after the data is output. Therefore, during this period, the amount of change in the voltage of the data line D2 due to the change in the voltage of the data line D1 can be minimized.
- the same effect as that of the above-described embodiment can be obtained. Furthermore, by reducing the load on the data line D1 before data is output, the voltage change amount on the data line D1 that changes according to the data output can be increased. By increasing the load on the data line D2 where data is not output until just before the differential amplifier 4 starts the amplification operation, the voltage of the data line D2 becomes the voltage of the data line pair D1-2 at the time of data output. It is possible to prevent changes due to force coupling capacity. As a result, it is possible to prevent the data reading margin from being reduced by the coupling capacity.
- FIG. 5 shows a data output operation in the third embodiment of the present invention.
- the same elements as those in the first and second embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.
- the operating power of the switches PS2 and CS2 connected to the data line (D2 in this example) from which no data is output is different from that in the second embodiment. For this reason, the switch control unit is different from the second embodiment.
- Other configurations of the semiconductor integrated circuit are the same as those of the second embodiment (FIG. 3).
- the switch control unit turns off the switch CS2 before the switch PS2 is turned off (FIG. 5 (a)).
- Switch PS2 is turned off immediately before differential amplifier 4 starts operation (Fig. 5 (b)).
- the load capacitance value of the data line D2 increases while the switch CS2 is on.
- the data line D2 on which no data is output is connected to the reference voltage line VREF by turning on the switch PS2. Therefore, the amount of change in the voltage of the data line D2 due to the change in the voltage of the data line D1 can be minimized.
- FIG. 6 shows details of the voltage change of the data line pair D1-2 in the period P1 of FIG.
- the change of the data line D2 when the present invention is applied is shown by a thick curve (d).
- the data line D2 changes greatly due to the voltage change of the data line D1 (curve a).
- the data line D2 increases in load capacitance, so the voltage change of the data line D1 (Curve b).
- the data line D2 When the data line D2 is connected to the reference voltage line VREF in the period PI and connected to the capacitor C2 in the first half of the period P1, the data line D2 has an increased load capacitance value. Insensitive to changes in voltage of D1 (curve d; this embodiment). That is, the voltage change of the data line D2 at the time of data output is slight. Thereafter, the capacitance C2 is disconnected from the data line D2, and the load capacitance value decreases. For this reason, the voltage of the data line D2 quickly returns to the reference voltage VREF by the reference voltage VREF supplied via the switch PS2. As a result, the voltage difference VD of the data line D1-2 when the differential amplifier 4 starts operation can be maximized.
- the timing for starting the operation of the differential amplifier 4 can be made earlier.
- the time from when the data output unit 18 starts outputting data until the differential amplifier 4 outputs the amplified data can be shortened.
- the access time can be shortened.
- the same effect as that of the above-described embodiment can be obtained. Furthermore, during the period from when the data is output until the differential amplifier 4 starts the amplification operation, By sequentially turning off the switch CS2 and switch PS2 corresponding to the data line D2 to which no data is output, the voltage of the data line D2 is reliably set to the reference voltage line REF before the differential amplifier 4 starts the amplification operation. it can. That is, it is possible to prevent the voltage line of the data line D 2 from which no data is output from changing due to the influence of the coupling capacitance when outputting the data.
- the data line D1 can be in a floating state and the load on the data line D1 can be reduced. . Therefore, the voltage change amount of the data line D1 that changes in response to the data output to the data line D1 can be increased.
- FIG. 7 shows a fourth embodiment of the present invention.
- This semiconductor memory has a DRAM memory cell (dynamic memory cell) using CMOS technology and is formed as an FCRAM (Fast Cycle RAM) having an SRAM interface.
- FCRAM is a type of pseudo-SRAM that periodically performs a refresh operation inside the chip without receiving a refresh command from the outside, and retains the data written in the memory cells. Note that the present invention can be applied to both a clock synchronous FCRAM and a clock asynchronous FCRAM.
- the FCRAM has a command input circuit 10, a command decoder 12, an operation control circuit 14, an address input circuit 16, predecoders 18 and 20, a data input / output circuit 22 and a memory core 24.
- the memory core 24 includes a precharge control circuit 26, a sense amplifier unit SA, a bit line transfer unit BT, a precharge unit PRE, a row decoder unit RDEC, a column switch unit CSW, a column decoder unit CDEC, a read amplifier unit RA, and a write It has an amplifier WA.
- FCRAM has a refresh timer, a refresh counter, an arbitration circuit that determines the priority order of external access requests and internal refresh requests from the refresh timer, a booster circuit that generates a high-level voltage such as a word line, and the like. And a precharge voltage generation circuit for generating a precharge voltage for the bit lines BL and ZBL.
- the command input circuit 10 receives the command signal CMD supplied via the command terminal CMD.
- the received signal Upon receiving (external access request signal, mode register setting signal, test command signal, etc.), the received signal is output as internal command signal ICMD.
- the command signal CMD can be a chip enable signal ZCE, an output enable signal ZOE, or a write enable signal.
- the command decoder 12 decodes the internal command signal ICMD and outputs a read signal RDZ for executing a read operation or a write signal WRZ for executing a write operation.
- the command decoder 12 decodes the test command signal CMD and the mouth address signal RAD, and activates the timing adjustment signal TADJO-4 to a high logic level.
- the timing adjustment signal TADJO-4 can be selected when the FCRAM status is changed to the normal operation mode force test mode by the test command signal CMD. Note that after FCRAM is powered on, the timing adjustment signal TADJ2 is activated to high logic level by default, and the other signals TADJO, 1, 3, and 4 are deactivated to low logic level.
- the normal operation mode is an operation mode in which access operations (read operation and write operation) are executed in response to an external access request.
- the operation control circuit 14 When the operation control circuit 14 receives the read signal RDZ, the write signal WRZ, or a refresh request signal (not shown), the operation control circuit 14 causes the memory core 24 to execute a read operation, a write operation, or a refresh operation. Outputs basic timing signals such as reset signal BRS, bit line transfer signal BTZ, latch enable signal LEZ, and word line activation signal WLZ.
- the address input circuit 16 receives the address signal AD via the address terminal AD, and outputs the received signal as a row address signal RAD and a column address signal CAD.
- This FCRAM is an address non-multiplexing type memory that receives the upper address and lower address simultaneously.
- the predecoder 18 decodes the row address signal RAD and generates a row decoding signal RAZ.
- the predecoder 20 decodes the column address signal CAD and generates a column decode signal CAZ.
- the data input / output circuit 22 receives read data from the memory cell MC via the common data bus line CDB, and outputs the received data to the data terminal DQ. Further, the data input / output circuit 28 receives the write data via the data terminal DQ and outputs the received data to the common data nos line CDB.
- the precharge control circuit 26 includes the bit line reset signal BRS, the bit line transfer signal BT Z, the timing adjustment signal TADJO-4, and the row address information from the row decoder RDEC. In response, a switch control signal is output to the precharge unit PRE and the bit line transfer unit BT.
- the precharge control circuit 26 has a bit line transfer switch (amplifier switch), precharge switch and equalizer, and an amplifier switch control signal (BLTL1-2, BLTR1 2) and precharge switch control signal to control the operation of the switch. Operates as a switch control unit that outputs (B RS1-2) and equalize switch control signals (BRS 1-2).
- the memory cell array ARY includes a plurality of volatile dynamic memory cells MC, a plurality of word lines WL connected to the dynamic memory cells MC, and a plurality of complementary bit line pairs BL and ZBL.
- Each memory cell MC is the same as a general DRAM memory cell, and includes a memory cell capacitor for holding data as a charge, and a transfer transistor disposed between the capacitor and the bit line BL (or ZBL). have. The gate of the transfer transistor is connected to the word line WL. Depending on the selection of the word line WL, any of read operation, write operation, and refresh operation is executed.
- the triangle mark of the memory cell MC indicates that the memory cell capacity is connected to the cell plate voltage line VCP.
- bit lines BL and ZBL are set to the precharge voltage VPR (reference voltage) in synchronization with the bit line reset signal BRS.
- VPR reference voltage
- the sense amplifier unit SA has a plurality of sense amplifiers (differential amplifiers) connected to the bit line pair BL, / BL, respectively. Each sense amplifier operates in synchronization with the sense amplifier activation signal PSD, NSD activation signal generated from the latch enable signal LEZ, and the bit line pair BL, ZBL (connection wiring pair CW, ZCW in Figure 9) ) Voltage difference.
- the data amplified by the sense amplifier is transmitted to the local data bus line LDB via the column switch during the read operation, and written to the memory cell MC via the bit lines BL and ZBL during the write operation.
- the bit line transfer unit BT has a plurality of bit line transfer switches (amplifier switches) for connecting the bit lines BL and ZBL to a sense amplifier. Each bit line transfer switch operates in synchronization with the bit line transfer signal BTZ.
- the sense amplifier is shared by a plurality of memory cell arrays ARY. Bit line transfer section BT is necessary to selectively connect the bit lines BL and ZBL of each memory cell array ARY to the sense amplifier.
- the precharge unit PRE has a plurality of precharge circuits connected to the bit line pairs BL and ZBL, respectively. Each precharge circuit operates in synchronization with the activation of the bit line reset signal BRS (high logic level), connects the bit lines BL and ZBL to the precharge voltage line VPR, and connects the bit lines BL and / BL to each other. Connecting.
- BRS bit line reset signal
- the row decoder unit RDEC When the row decoder unit RDEC receives a high logic level word line activation signal WLZ, it selects one of the word lines WL according to the row decode signal RAZ, and changes the selected word line WL to a high logic level. Let In response to the column decode signal CAZ, the column decoder unit CDEC outputs a column selection signal CL, which will be described later, to turn on the column switch.
- the column switch section CSW has a plurality of column switches connected to the bit lines BL and ZBL, respectively. Each column switch connects the bit lines BL and ZBL to the local data bus line LDB shown in FIG. 9 during the activation of the column selection signal CL generated by the column decoder CDEC.
- the read amplifier RA amplifies the amount of read data on the local data bus line LDB and outputs it to the common data bus line CDB.
- the write amplifier WA amplifies the amount of write data on the common data bus line CDB and outputs it to the local data bus line LDB.
- FIG. 8 shows an overview of the memory core unit 24 shown in FIG.
- the memory core section 24 has memory cell arrays ARY and boundary areas BA arranged alternately.
- a thick line frame in the boundary area BA indicates a formation area of one sense amplifier.
- the sense amplifier unit SA, the precharge unit PRE, the bit line transfer unit BT, and the column switch unit CSW are arranged in the boundary area BA.
- the boundary area BA is commonly used for the bit line pair BL, ZBL (data line) of a pair of adjacent memory cell arrays ARY. More specifically, each boundary area BA is connected to an even-numbered bit line pair BL, ZBL or an odd-numbered bit line pair BL, / BL.
- the pair of memory cell arrays ARY operate as a pair of data output units that output data to one of the bit lines BL and ZBL.
- Each memory cell array ARY has, for example, 64 word lines WL (WLO-WL63) and redundant word lines RWL.
- the redundant word line RWL is used to relieve defective memory cells.
- a circle at the intersection of the word lines WL and RWL and the bit line BL (or ZBL) indicates the memory cell MC.
- local data bus lines LD B (LDBO-3, ZLDBO-3) are wired.
- Local data bus lines LDBO-3 and ZLDBO-3 are connected to bit lines BL and ZBL via column switches indicated by black circles in the figure.
- the column switch is selected by using a column selection signal transmitted to a column selection line CL (CLO, etc.) wired in parallel on the bit lines BL, / BL.
- CL column selection line
- bit line pairs BL and ZBL (BLO, ZBLO, etc.) arranged in the vertical direction in the figure are alternately connected to the boundary areas BA on the left and right sides.
- FIG. 9 shows details of the boundary area BA shown in FIG.
- the circuit elements indicated by the broken lines formed in the precharge portion PRE, the bit line transfer portion BT, the column switch portion CSW, and the sense amplifier portion SA are referred to as the precharge circuit PRE, the bit line transfer switch BT. Also referred to as column switch CSW and sense amplifier SA.
- “L” and “R” are appended to the end of the bit lines BL and ZBL formed in the left and right memory cell arrays ARY of the boundary area BA, respectively.
- the precharge circuit PRE is arranged on the memory cell array ARY side with respect to the bit line transfer portion BT.
- the precharge circuit PRE includes a pair of nMOS transistors (precharge switch) for connecting the bit lines BL and ZBL to the precharge voltage line VPR, and an nMOS transistor for connecting the bit lines BL and ZBL to each other ( (Eco-Rice, switch).
- the gate of the nMOS transistor in the precharge circuit PRE receives one of the bit line reset signals BRS1-2 (precharge switch control signal, equalize switch control signal).
- the bit line reset signal BRS1-2 is generated by the precharge control circuit 26 shown in FIG. 7 using the bit line reset signal BRS and the row address information.
- the bit line transfer switch BT is composed of an nMOS transistor (amplifier switch).
- the bit line transfer switch BT connects the bit lines BL and ZBL to the sense amplifier SA via the connection wiring pair CW and ZCW (CW0, CW2, ZCW0, ZCW2).
- Bit line transfer switch BT gate is connected to bit line transfer signal BLTL 1 ⁇ 2, BLT In response to Rl-2 (amplifier switch control signal).
- the bit line transfer signals BLTL1-2 and BLTR1-2 are generated by the precharge control circuit 26 using the bit line transfer signal BLT and the row address information.
- the high level voltage of the bit line reset signal BRS 1-2 and the bit line transfer signals BLTL1-2, BLTR1-2 is a boost voltage to increase the gate-source voltage of the nMOS transistor and lower the on-resistance. Is used.
- the column switch CSW is composed of an nMOS transistor that connects the bit line BL and the local data bus line LDB, and an nMOS transistor that connects the bit line / BL and the local data bus line / LDB.
- the gate of each nMOS transistor of the column switch CSW receives a column selection signal CL (CL0 in Fig. 9).
- the sense amplifier S A is composed of a latch circuit whose power supply terminals are connected to the sense amplifier activation signal lines NSD and PSD, respectively.
- the sense amplifier activation signal lines NSD and PSD are respectively connected to the source of the pMOS transistor and the source of the nMOS transistor that constitute the latch circuit.
- the sense amplifier activation signal lines NSD and PSD are generated by the precharge control circuit 26 shown in FIG. 7 using the latch enable signal LEZ and the row address information.
- the sense amplifier SA is shared by the memory cell arrays ARY on both the left and right sides of the figure.
- FIG. 10 shows the read operation of the FCRAM of the fourth embodiment.
- the word line WL0 of the memory cell array ARY on the right side shown in FIG. 9 is selected, and the data from the memory cells MC connected to the bit lines BL0R, BL1R, and BL2R shown in broken lines in FIG. Is read out.
- the data read to the bit line BL1R is amplified by a sense amplifier SA (not shown).
- SA not shown
- the right memory cell array ARY including the memory cell MC from which data is read is referred to as an active array
- the left memory cell array ARY including the memory cell MC from which data is not read is referred to as an inactive array.
- the memory cell MC force of the memory cell array ARY on the right side of the figure is also read to the bit line BL0R by the activation of the word line WL0, and then the voltage difference between the bit line pair BL0R and ZBL0R is sensed Amplified by amplifier SA.
- pre-charge circuit PRE nMOS transistor and bit line transfer switch BT are all on. is doing. As a result, all bit lines BL and / BL are precharged to the precharge voltage VPR.
- bit lines BLOR and ZBLOR correspond to the data lines DR1 and DR2 in FIG.
- Bit lines BLO L and ZBLOL correspond to data lines DL1 and DL2 in FIG.
- Bit line reset signal BRS1 corresponds to the switch control signal that controls the operation of switches PSL1-2 and ESL1 in Fig. 2.
- Bit line reset signal BRS2 corresponds to the switch control signal that controls the operation of switches PSR1-2 and ESR1 in Figure 2.
- Bit line transfer signals BLTL1 and BLTL2 correspond to the switch control signals that control the operation of switches ASL1 and ASL2 in Fig. 2.
- Bit line transfer signals BLTR1 and BLTR2 correspond to the switch control signals that control the operation of switches ASR1 and ASR2 in Figure 2.
- bit line reset signal BRS2 is deactivated to the low logic level, and the bit lines BL and / BL on the active array side are precharged. The connection with the voltage line VPR is released.
- bit line transfer signal BLTL1 is deactivated to a low logic level, and the connection between the bit line BLOL on the non-active array side corresponding to the bit line BLOR from which data is output and the sense amplifier SA is released ( Fig. 10 (a)
- bit line reset signal BRS1 and the bit line transfer signal BLTR1-2 are maintained at the high level voltage VPP during the read operation (FIG. 10 (b)).
- the bit line transfer signal BLT L2 is maintained at the high level voltage VPP until the sense amplifier activation signal PSD, NSD is activated after the word line WLO is activated (FIG. 10 (c)). ).
- bit line ZBLOR is a bit line transfer switch BT and a precharge circuit PRE on the inactive array side.
- the bit line / BLOR is also connected to the bit line BLOL charged to the precharge voltage VPR by the pre-charge circuit PRE on the inactive array side.
- the sense amplifier activation signal PSD, NSD is activated from the deactivation level (VPR), respectively.
- the sense amplifier SA starts an amplification operation, and the voltage difference between the bit line pair BLOR and / BLOR is amplified (Fig. 10 (e)).
- a column selection signal CLO (not shown) is activated to a high logic level, and read data is output to the local data bus lines LDB and ZLDB.
- the word line WLO and the sense amplifier activation signal PSD, NSD are sequentially deactivated (FIG. 10 (f)).
- the amplification operation of the sense amplifier SA is stopped by the deactivation of the sense amplifier activation signal PSD, NSD.
- the bit line reset signal BRS2 and the bit line transfer signal BLTL1-2 change to the high level voltage VPP, the bit line pair BLOR and ZBLOR on the active array side are precharged to the precharge voltage VPR, and the read operation is performed. Completion ( Figure 10 (g)).
- Figure 10 (g) it is possible to prevent a change in the voltage of the bit line due to the influence of the coupling capacitance without adding a special element to the current sense amplifier SA.
- FIG. 11 shows a test command sequence when changing the off timing of the bit line transfer switch BT on the inactive array side corresponding to the bit line from which data is output.
- the test command is accepted by asserting the chip enable signal ZCE, output enable signal Z OE, write enable signal ZWE, upper byte signal ZUB and lower byte signal ZLB four times in succession to a low logic level. At this time, the FCRAM status also shifts to normal mode.
- the off timing of the bit line transfer signal BLTL2 is changed by the test code CODE supplied to the address terminal AD (RAD4-0) together with the test command. That is, the timing changing circuit 26 shown in FIG. 12 can adjust the off timing of the bit line transfer signal BLTL 2 only during the test mode.
- Command input circuit 10 and address input The circuit 16 operates as a command input circuit that receives a timing change command for changing the OFF timing of the bit line transfer switch BT.
- the output enable signal ZOE is set to a low logic level when executing a read operation, and the write enable signal ZWE is set to a low logic level when executing a write operation. For this reason, the test command in which the signals ZOE and ZWE simultaneously change to a low logic level is an illegal command that is not used in normal read and write operations.
- the command decoder 12 shown in FIG. 7 when the command decoder 12 shown in FIG. 7 receives an address signal RAD2-0 of “000” in binary together with the test command, the command decoder 12 sets the off timing of the bit line transfer switch BT. Set to minimum value DLYO and activate only timing adjustment signal TADJO to high logic level. Similarly, the command decoder 12 selects one of the timing adjustment signals TADJO-4 to set the bit line transfer switch BT off timing DLY1-4 according to the address signal RAD2-0 supplied with the test command. Is activated to a high logic level.
- the command decoder 12 when the command decoder 12 receives the address signal RAD2-0 “111” in binary, it exits the test mode and returns to the normal operation mode (exit command).
- the address terminal AD to receive the test code CODE, you can easily change the timing of multiple switches. For example, the off timing can be adjusted for each switch by selecting the switch using the reserved address signal RAD4-3. The off timing adjusted during the test mode is maintained until the FCRAM power is turned off or the off timing is adjusted again by the test command.
- the deactivation timing (off timing) of the bit line transfer signal BLTL2 is evaluated using a test command. If the evaluation determines that the default timing (TAD J2) is not optimal, for example, a photomask for manufacturing FCRAM is used to optimally set the deactivation timing of the bit line transfer signal BLTL2. Be changed.
- TAD J2 the default timing
- a photomask for manufacturing FCRAM is used to optimally set the deactivation timing of the bit line transfer signal BLTL2. Be changed.
- this embodiment is combined with a seventh embodiment (fuse circuit 34) described later to thereby deactivate the bit line transfer signal BLTL2 without changing the photomask. Imming can be set optimally. Specifically, first, the deactivation timing of the optimum bit line transfer signal BLTL2 is evaluated using a test command. Then program the fuses according to the evaluation results! ,.
- FIG. 12 shows a timing change circuit 26a that generates a timing signal BLTF1 that determines the OFF timing of the bit line transfer switch BT in the precharge control circuit 26 shown in FIG.
- the timing changing circuit 26a includes a nother circuit 26b, four delay circuits 26c connected in cascade, and a selection circuit 26d for selecting one of the outputs of the buffer circuit 26b and the delay circuit 26c.
- the notfer circuit 26b delays the bit line transfer signal BT from the operation control circuit 14 and generates the timing signal BLTFO.
- the timing signal BLTFO sets the off timing (bit line transfer signal BLTL1 in Fig. 10 (a)) of the bit line transfer switch BT on the inactive array side corresponding to the bit line to which data is output.
- the delay circuit 26c has a pair of inverters and a capacitor connected between the inverters.
- the selection circuit 26d has a CMOS transmission gate for selectively outputting the output signal from each delay circuit 26c and the output signal from the buffer circuit 26b as a timing signal BLTF1 through an inverter.
- Timing signal BLTF1 sets the bit line transfer switch BT on the inactive array side corresponding to the bit line to which no data is output (bit line transfer signal BLTL2 in Fig. 10 (c)).
- the deactivation timing of the bit line transfer signal BLTL2 is set by the timing signal BLTFO, and the deactivation timing of the bit line transfer signal BLTL1 is set by the timing signal BLTF1. Timing is set.
- the timing signal BLTFO sets one inactive timing of the bit line transfer signal BLTR1-2.
- Timing signal BLTF1 sets the other inactive timing of bit line transfer signal BLTR1-2.
- the selection circuit 26d Upon receiving the activation signal of the timing adjustment signal TADJ1-4, the selection circuit 26d selects the output of the delay circuit 26c in the first to fourth stages, inverts the level of the selected output, and Output as BLTF1. In other words, the selection circuit 26d performs bit line transfer.
- the timing of deactivation of the bit line transfer signal BLTL2 is changed by changing the load existing on the signal path for generating the signal BLTL2.
- the selection circuit 26d When receiving the activation signal of the timing adjustment signal TADJO, the selection circuit 26d inverts the output of the buffer circuit 26b and outputs it as the timing signal BLTF1. For this reason, when the timing adjustment signal TADJO is activated, the off timing of the pair of bit line transfer switches BT on the inactive array side is the same. That is, the off timing of the bit line transfer switch BT on the inactive array side corresponding to the bit line to which no data is output is set before the word line WL is activated.
- the switch control signals such as the other bit line transfer signal BLTL1 and the bit line reset signal BRS1-2 are deactivated. It is also possible to adjust the timing (off timing). Alternatively, it is possible to adjust the activation timing (ON timing) of the switch control signal. At this time, the timing of the switch control signal can be easily adjusted by increasing the bits of the address signal RAD used for the test CODE supplied with the test command.
- FIG. 13 shows a multi-chip package MCP (system) on which the above-described FCRAM is mounted.
- the multi-chip package MCP is equipped with flash memory (hereinafter referred to as FLASH) and a memory controller for accessing FCRAM and FLASH.
- FLASH flash memory
- the present invention can also be applied to a semiconductor integrated circuit such as FCRAM mounted on a multichip package MCP.
- the timing change circuit 26a can evaluate the optimum deactivation timing of the bit line transfer signal (BLTL2 or the like). By feeding back the evaluation results to the manufacturing process or design process, an FCRAM with a large data read margin can be configured. In other words, the yield of FCRAM can be improved.
- FIG. 14 shows a fifth embodiment of the present invention.
- the same elements as those described in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.
- a command decoder 12A and a precharge control circuit 28 are formed instead of the command decoder 12 and the precharge control circuit 26 of the fourth embodiment (FIG. 7).
- a mode register 30 is newly formed.
- Other configurations are the same as those of the fourth embodiment. That is, the semiconductor integrated circuit of this embodiment is formed as FCRAM.
- the command decoder 12A has a function of activating the mode register setting signal MRSZ when the mode register setting command is decoded in addition to the function of the fourth embodiment.
- the mode register 30 receives the address signal RAD in synchronization with the activation of the mode register setting signal MRSZ, and activates one of the timing adjustment signals TA DJ0-4 according to the received address signal RAD. That is, in this embodiment, the deactivation timing of the bit line transfer signal BLTL2 is changed according to the value set in the mode register 30.
- the relationship between the address signal RAD and the activated timing adjustment signal TADJ0-4 is the same as in FIG.
- the precharge control circuit 28 turns off the bit line transfer switch BT on the inactive array side corresponding to the bit line to which no data is output in response to the timing adjustment signal TADJO —4. Adjust timing.
- FIG. 15 shows a timing changing circuit 28a for generating a timing signal BLTF1 for determining the OFF timing of the bit line transfer switch BT in the precharge control circuit 28 shown in FIG.
- the timing changing circuit 28a includes a buffer circuit 28b, four delay circuits 28c, a selection circuit 28d for selecting one of the outputs of the buffer circuit 28b and the delay circuit 28c.
- the nother circuit 28b and the selection circuit 28d are the same as the buffer circuit 26b and the selection circuit 26d of the fourth embodiment.
- the delay circuit 28c has a pair of inverters, and a resistor and a capacitor connected between the inverters.
- the delay circuit 28c commonly receives the bit line transfer signal BTZ and outputs the delayed signal to the selection circuit 28d.
- the delay time of the delay circuit 28c is set according to a time constant determined by resistance and capacitance. For this reason The delay time of the delay circuit 28c increases as the product of the resistance value and the capacitance value increases.
- Resistors RZ2 and 2R have resistance values 1Z2 and 2 times that of resistor R.
- capacitance 2C has a capacitance value twice that of capacitance C.
- the selection circuit 28d selects either the output of the delay circuit 28c or the output of the buffer circuit 28b according to the activated timing adjustment signal TAD JO-4. That is, the selection circuit 28d changes the inactive timing of the bit line transfer signal BLTL2 by changing the load amount existing on the signal path for generating the bit line transfer signal BLTL2.
- FIG. 16 shows a silicon-on-chip SOC (system) in which the above-described FCRAM is embedded.
- SOC has CPU, memory controller, peripheral circuit, FLASH and power supply unit in addition to FCRAM.
- the memory controller operates to access FCRAM and FLASH by the CPU.
- Peripheral circuits are timers and communication interfaces.
- the power supply unit generates multiple types of power supply voltages for use in the SOC.
- the present invention can also be applied to a semiconductor integrated circuit such as FCRAM embedded in a silicon-on-chip SOC.
- the same effect as that of the above-described embodiment can be obtained. Further, the timing of deactivation of the bit line transfer signal (for example, BLTL2) can be adjusted by the mode register 30.
- FIG. 17 shows a sixth embodiment of the present invention.
- a command decoder 12B is formed instead of the command decoder 12 of the fourth embodiment (FIG. 7).
- a timing decoder 32 is newly formed.
- Other configurations are the same as those of the fourth embodiment. That is, the semiconductor integrated circuit of this embodiment is formed as an FCRAM.
- the command decoder 12B is the same as the command decoder in FIG. 7 except that it does not have a function of outputting the timing adjustment signals TADJ0-4.
- the timing decoder 32 decodes the logic level of the external test signal EXT2-0 supplied from the outside of the FC RAM via the test pad —2-0 and activates one of the timing adjustment signals TADJ0-4
- the relationship between the external test signal EXT2-0 and the timing adjustment signal TADJO-4 activated is the same as the relationship between the address signal RAD2-0 and the timing adjustment signal TADJO-4 in FIG.
- a timing changing circuit 26a (not shown) in the precharge control circuit 26 changes the inactive timing (off timing) of the bit line transfer signal BLTL2 according to the timing adjustment signal TADJO-4. That is, in this embodiment, the deactivation timing of the bit line transfer signal BLTL2 is changed according to the logic level of the signal supplied to the test pad EXT2-0.
- the test pads EXT2-0 are pulled up to the power supply line inside the FCRAM. Therefore, when the external test signal EXT2-0 is not supplied (default state), the timing decoder 32 receives the external test signal EXT2-0 having a high logic level. At this time, the timing decoder 32 activates only the timing adjustment signal TADJ2 to a high logic level.
- test pad EXT2-0 is bonded to the power supply line or the ground line, so that the deactivation timing of the bit line transfer signal BLTL2 is optimized for each FCRAM chip. Can be set and shipped in this state.
- the deactivation timing of the bit line transfer signal BLTL2 can be adjusted according to the external test signal EXT2-0 supplied from outside the FCRAM. Therefore, the read margin can be adjusted for each FCRAM chip in the FCRAM manufacturing process (for example, the test process).
- FIG. 18 shows a seventh embodiment of the present invention.
- a command decoder 12B is formed instead of the command decoder 12 of the fourth embodiment (FIG. 7).
- a fuse circuit 34 and a timing decoder 32 are newly formed.
- Other configurations are the same as those of the fourth embodiment. That is, the semiconductor integrated circuit of this embodiment is formed as FCRAM.
- the fuse circuit 34 has fuses FS2-0.
- the fuse circuit 34 has each fuse When FS2-0 is S-cut (programmed), a low logic level fuse signal F2-0 is output, and when each fuse FS2-0 is not cut, a high logic level fuse signal F2-0 is output. Output. That is, the fuse signal F2-0 indicates the program state of the fuse FS2-0.
- the timing decoder 32 decodes the logic level of the fuse signal F2-0 output from the fuse circuit 34 and activates one of the timing adjustment signals TADJO-4! To do.
- the relationship between the fuse signal F2-0 and the activated timing adjustment signal TADJ0-4 is the same as the relationship between the address signal RAD2-0 and the timing adjustment signal TADJO-4 in FIG.
- a timing changing circuit 26a (not shown) in the precharge control circuit 26 changes the inactivity timing (off timing) of the bit line transfer signal BLTL2 according to the timing adjustment signal TADJO-4. That is, in this embodiment, the inactive timing of the bit line transfer signal (for example, BLTL2) is changed according to the logic level of the fuse signal F2-0 indicating the program state of the fuse F S2-0.
- the inactive timing of the bit line transfer signal (for example, BLTL2) can be adjusted according to the program state of fuse FS2-0.
- FIG. 19 shows an eighth embodiment of the present invention.
- the same elements as those described in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.
- a command decoder 12A and a precharge control circuit 36 are formed instead of the command decoder 12 and the precharge control circuit 26 of the fourth embodiment (FIG. 7).
- a mode register 30 is newly formed.
- Other configurations are the same as those of the fourth embodiment. That is, the semiconductor integrated circuit of this embodiment is formed as FCRAM.
- the precharge control circuit 36 is similar to the fourth embodiment in that the timing adjustment signal TADJ1 Adjust the OFF timing of the bit line transfer switch BT on the inactive array side corresponding to the bit line to which no data is output according to —4.
- FIG. 20 shows a timing change circuit 36a that generates a timing signal BLTF1 that determines the OFF timing of the bit line transfer switch BT in the precharge control circuit 36 shown in FIG.
- the timing changing circuit 36a includes a buffer circuit 28b, a delay circuit 36b, and a selection circuit 36c for selecting a deviation of the delay signal ZBLTF1 4 from the delay circuit 36b in response to the timing adjustment signal TADJ 1-4.
- FIG. 21 shows details of the delay circuit 36b of FIG.
- the delay circuit 36b has delay stages 36d, 36e, 36f, and 36g that are also cascade-connected two-stage inverters.
- the delay time of the delay stage is 36d ⁇ 36e ⁇ 36f ⁇ 36g.
- a pMOS transistor connected to the internal power supply line VII is formed at the output of the preceding CMOS inverter, and the output of the subsequent CMOS inverter is connected to the ground line VSS.
- An nM OS transistor is formed.
- the delay time of the delay signal ZBLTF0 to the falling edge of the delay signal ZBLTF1 is shortened.
- the internal power supply voltage VII supplied from the internal power supply line VII is generated using the external power supply voltage supplied from the external cable of the FCRA M through the external power supply terminal.
- the internal power supply voltage VII is a constant voltage that does not depend on the external power supply voltage or the chip temperature.
- the delay stage 36e is composed of a normal CMOS inverter.
- a pMOS transistor PSZnMOS transistor NS having a channel length L shorter than other transistors is arranged between the pMOS transistor and the nMOS transistor in order to increase the delay time.
- Each CMOS inverter in the delay stage 36g has a channel length L longer than the other transistors between the pMOS transistor and the nMOS transistor, and a pMOS transistor PL / nMOS transistor NL is arranged in order to maximize the delay time! /,
- the channel length L of the transistors other than the transistors PSZNS and PLZNL is a standard size.
- the channel length L of the pMOS transistors PS and PL is set to the standard size, the gate width W of the pMOS transistor PS is made longer than the standard size, and the gate width W of the pMOS transistor PL is made shorter than the standard size.
- Delay time can be obtained. That is, in this embodiment, the transistor channel length L or By selecting one of the delay stages 36d, 36e, 36f, and 36g having transistors with different gate widths W, the inactive timing of the bit line transfer signal (for example, BLTL2) is changed.
- the delay time of the pMOS transistors PS and PL can be decreased by increasing the ratio WZL of the gate width W and the channel length L, and can be increased by decreasing the ratio WZL. Therefore, the same delay time can be obtained by increasing the ratio WZL of the pMOS transistor PS and decreasing the ratio WZL of the pMOS transistor PL. That is, by forming transistors with different gate width W and / or channel length L in the timing change circuit 36, the generation timing of the falling edge of the bit line transfer signal BLTL2 shown in FIG. 10 can be changed.
- the deactivation timing of the bit line transfer signal (for example, BLTL2) can be easily selected by selecting one of the delay circuits 36d, 36e, 36f, 36g with different transistor sizes. Can change.
- FIG. 22 shows a mode register 30a and a timing change circuit 37a in the ninth embodiment of the present invention.
- the same elements as those described in the embodiment described above are denoted by the same reference numerals, and detailed description thereof will be omitted.
- a mode register 30a and a timing change circuit 37a are formed instead of the mode register 30 and the timing change circuit 36a of the eighth embodiment.
- Other configurations are the same as those of the eighth embodiment. That is, the semiconductor integrated circuit of this embodiment is formed as FCR AM.
- the mode register 30a has a function of outputting a timing adjustment signal ZTADJ1-4 in which the logic levels of the timing adjustment signal TADJ1-4 and the timing adjustment signal TADJ1-4 are inverted. Other functions of the mode register 30a are the same as those of the mode register 30.
- the timing changing circuit 37a includes a nother circuit 28b and a delay circuit 37b that delays the delay signal ZBLTF0 in response to the timing adjustment signals TADJ1-4 and ZTADJ1-4 to generate the timing signal BLTF1. .
- FIG. 23 shows details of the delay circuit 37b.
- Delay circuit 37b consists of two cascaded stages Delay stages 37d, 37e, 37f, and 37g comprising inverters.
- the delay time of the delay stage is 37d, 37e, 37f, 37g.
- the delay stages 37d, 37e, 37f, and 37g are configured by adding pMOS transistors and nMOS transistors to the power supply lines VII and VSS of the subsequent CMOS inverter.
- the other configurations of the delay stages 37d, 37e, 37f, and 37g are the same as those of the delay stages 36d, 36e, 36f, and 36g shown in FIG.
- the gates of newly added pMOS and nMOS transistors receive timing adjustment signals TADJl-4 and ZTADJ1-4.
- the delayed signal ZBLT F0 is delayed from any one of the delay stages 37d, 37e, 37f, and 37g selected according to the timing adjustment signals TADJ1-4 and ZTADJ1-4.
- the delay circuit 37b can adjust the delay time of the timing signal BLTF1 according to the timing adjustment signals TADJ1-4 and ZTADJ1-4.
- the same effect as that of the above-described embodiment can be obtained.
- Fig. 24 shows ten embodiments of the present invention.
- the same elements as those described in the embodiment described above are denoted by the same reference numerals, and detailed description thereof will be omitted.
- a command decoder 12A and a precharge control circuit 40 are formed instead of the command decoder 12 and the precharge control circuit 26 of the fourth embodiment (FIG. 7).
- a mode register 30 and a substrate voltage generation circuit 38 for generating a plurality of types of substrate voltages BP and BN are newly formed.
- Other configurations are the same as those in the fourth embodiment. That is, the semiconductor integrated circuit of this embodiment is formed as an FCRAM.
- the substrate voltage generation circuit 38 changes the voltage values of the substrate voltages BP and BN according to the timing adjustment signal TADJ1-4.
- the substrate voltage BP is supplied to the substrate of the p MOS transistor that constitutes the delay circuit 40b shown in FIG.
- the substrate voltage BN is supplied to the substrate of the n MOS transistor constituting the delay circuit 40b.
- the precharge control circuit 40 generates the timing of the falling edge of the bit line transfer signal BLTL2 using the substrate voltages BP and BN.
- FIG. 25 shows details of the substrate voltage generation circuit 38 shown in FIG.
- the substrate voltage generation circuit 38 includes resistor strings Rl and R2 and selection circuits 38a and 38b.
- the resistor string R1 has a plurality of resistors arranged in series between the boosted voltage line VPP and the internal power supply line VII.
- the selection circuit 38a receives the timing adjustment signal TADJ1—4 at the high logic level, the selection circuit 38a selects the voltage VP1-4 (VP1 ⁇ VP2 ⁇ VP3 ⁇ VP4) output from the resistor string R1, and the substrate voltage BP Output as.
- the resistor string R2 has a plurality of resistors arranged in series between the ground line VSS and the negative voltage line VNG.
- the selection circuit 38b selects the voltage VN1-4 (VN1> VN2> VN3> VN4) output from the resistor string R2 when receiving the high logic level timing adjustment signal TADJ1-4, and the substrate voltage BN Output as.
- the smaller the number at the end of the timing adjustment signal TADJ1-4 the lower the substrate voltage BP and the higher the substrate voltage BN.
- FIG. 26 shows a timing change circuit 40a that generates a timing signal BLTF1 that determines the OFF timing of the bit line transfer switch BT in the precharge control circuit 40 shown in FIG.
- the timing changing circuit 40a has a buffer circuit 28b and a delay circuit 40b.
- the delay circuit 40b is composed of a pair of cascaded CMOS inverters.
- the substrate of the pMOS transistor and nMOS transistor of each CMOS inverter receives the substrate voltages BP and BN, respectively.
- the threshold voltage (absolute value) of the pMOS transistor becomes lower as the substrate voltage BP is lower, and the pMOS transistor becomes easier to turn on.
- the threshold voltage of the nMOS transistor becomes lower as the substrate voltage BN (negative voltage) becomes higher, and the nMOS transistor becomes easier to turn on.
- the timing changing circuit 40a adjusts the delay time of the timing signal BLTF 1 according to the timing adjustment signal TADJ 1 -4 by using the variable substrate voltage.
- the same effect as that of the above-described embodiment can be obtained.
- the generation timing of the falling edge of the bit line transfer signal (for example, BL TL2) can be easily changed by changing the substrate voltages BP and BN.
- FIG. 27 shows an eleventh embodiment of the present invention.
- the same elements as those described in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.
- a substrate voltage generation circuit 39 and a precharge control circuit 41 are formed instead of the substrate voltage generation circuit 38 and the precharge control circuit 40 of the tenth embodiment.
- Other configurations are the same as those of the tenth embodiment. That is, the semiconductor integrated circuit of this embodiment is formed as FCRAM.
- the substrate voltage generation circuit 39 generates substrate voltages BP1-4 and BN1-4 having different voltages.
- the substrate voltage BP 1-4 is set to BPK BP2 BP3 BP4.
- the value of board voltage BN 1-4 is set to BN1> BN2> BN3> BN4.
- the precharge control circuit 41 uses either the substrate voltage BP1-4 or the substrate voltage BN1-4 to shift the bit line transfer signal (for example, BLTL2). Generate falling edge timing.
- FIG. 28 shows a timing change circuit 41a that generates a timing signal BLTF1 that determines the OFF timing of the bit line transfer switch BT in the precharge control circuit 41 shown in FIG.
- the timing change circuit 41a includes a buffer circuit 28b, delay circuits 41b, 41c, 41d, 41e, and the same selection circuit 36c as FIG.
- the delay circuits 41b, 41c, 41d and 41e are each composed of a pair of cascaded CMOS inverters.
- the substrate of the pMOS transistor and nMOS transistor of each CMOS inverter receives the substrate voltages BP1-4 and BN1-4, respectively. Due to the relationship between the substrate voltages B P1-4 and BN1-4, the delay times of the delay circuits 41b, 41c, 41d, 41e are set to 41b ⁇ 41c ⁇ 41d ⁇ 41e.
- the delay circuits 41b, 41c, 41d, and 41e delay the delay signal / BLTF0 and generate the timing signals ZBLTF1-4.
- the selection circuit 36c selects one of the timing signals ZBLTF1-4 according to the timing adjustment signal TADJ1-4 and outputs it as the timing signal BLTF1. From this, the falling edge generation timing of the bit line transfer signal BLTL2 shown in Figure 10 can be changed. As described above, also in the eleventh embodiment, the same effect as in the above-described embodiments can be obtained. Further, the selection circuit 36c selects any one of the delay circuits 41b, 41c, 41d, and 41e to which different substrate voltages BP1-4 and BN1-4 are supplied, so that the bit line transfer signal (for example, BLTL2) rises. The generation timing of the falling edge can be easily changed.
- FIG. 29 shows a twelfth embodiment of the present invention.
- the same elements as those described in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.
- an internal voltage generation circuit 42 and a precharge control circuit 44 are formed instead of the substrate voltage changing circuit 38 and the precharge control circuit 40 of the tenth embodiment.
- Other configurations are the same as those of the tenth embodiment. That is, the semiconductor integrated circuit of this embodiment is formed as FCRAM.
- Internal voltage generation circuit 42 generates internal power supply voltage VII using external power supply voltage VDD and also generates internal power supply voltage VIII.
- the internal power supply voltage VII is a fixed voltage
- the internal power supply voltage VIII is a variable voltage.
- the internal voltage generation circuit 42 changes the value of the internal power supply voltage VIII according to the timing adjustment signal TADJ 1-4. Specifically, the smaller the number at the end of the timing adjustment signal TADJ1-4, the higher the internal power supply voltage VIII.
- the precharge control circuit 44 generates the timing of the falling edge of the bit line transfer signal BLTL2 using the internal power supply voltage VIII.
- FIG. 30 shows a timing change circuit 44a that generates a timing signal BLTF1 that determines the OFF timing of the bit line transfer switch BT in the precharge control circuit 44 shown in FIG.
- the timing changing circuit 44a has a buffer circuit 28b and a delay circuit 44b.
- the delay circuit 44b is composed of a pair of cascaded CMOS inverters. The source of the pMOS transistor of each CMOS inverter is connected to the internal power line VIII.
- the timing changing circuit 44a adjusts the delay time of the timing signal BLTF1 according to the timing adjustment signal TADJ1-4 by using the variable internal power supply voltage VIII. As a result, the bit line transfer signal BLTL2 shown in FIG. The generation timing of the trailing edge can be changed.
- the generation timing of the falling edge of the bit line transfer signal (for example, BLTL2) can be easily changed by changing the internal power supply line VIII.
- FIG. 31 shows a thirteenth embodiment of the present invention.
- the same elements as those described in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.
- a command decoder 12B and a memory core 24A are formed instead of the command decoder 12 and the memory core 24 of the fourth embodiment (FIG. 7).
- Other configurations are the same as those of the fourth embodiment. That is, the semiconductor integrated circuit of this embodiment is formed as an FCRAM.
- the FCRAM can be configured as an MCP or SOP as in the fourth or fifth embodiment (FIGS. 13 and 16).
- the command decoder 12B activates one of the timing adjustment signals TADJ0-6 to a high logic level according to the test code (row address signal RAD) supplied together with the test command. After FCRAM is powered on, the timing adjustment signal TADJ2 is activated to a high logic level as a default.
- the memory core 24A has a precharge control circuit 46 instead of the precharge control circuit 26 of the fourth embodiment.
- each sense amplifier SA is connected only to a pair of bit lines BL and / BL. For this reason, the memory core 24A does not have the bit line transfer portion BT of FIG. Further, the memory core 24A has a precharge capacity unit PC shown in FIG. 32 to be described later.
- the precharge control circuit 46 has a function of controlling the precharge capacitor unit PC in place of the function of controlling the bit line transfer unit BT. That is, the precharge control circuit 46 operates as a switch control unit that outputs switch control signals CNT1-2 and BRS in order to control operations of a capacity switch PSW, a precharge switch, and an equalize switch, which will be described later. In addition, the precharge control circuit 46 deactivates a switch control signal (one of CNT1 and 2) that controls the operation of the capacitor switch PSW connected to a bit line (one of BL and ZBL) to which data described later is not output. It has a function to change the timing according to the timing adjustment signal T ADJ0-6. Precharge control circuit 46 other The function is the same as that of the precharge control circuit 26.
- FIG. 32 shows a main part of the memory core 24A shown in FIG.
- the precharge capacitor part PC, the precharge part PRE, the column switch part CSW, and the sense amplifier part SA are arranged in the boundary area BA1.
- the complementary bit line pairs BLO-1 and / BL0-1 in the memory cell array ARY are connected to the sense amplifier SA, respectively.
- the memory cell MC closest to the boundary area BA1 is a redundant memory cell and is connected to the redundant word line RWL.
- the other basic configuration is the same as in Fig. 9 except for the precharge capacitor PC.
- the precharge capacitor unit PC includes a capacitor switch PSW composed of nMOS transistors corresponding to the bit lines BL and ZBL, and a precharge capacitor PCA arranged between the capacitor switch PSW and the precharge voltage line VPR. have.
- the precharge capacitor PCA is used as a load connected to the bit lines BL and ZBL.
- Capacitance switch PSW gates connected to bit lines BL and ZBL receive switch control signals CNT1 and CNT2, respectively.
- the switch control signal CNT1-2 is generated by the precharge control circuit 46.
- Capacitance switch PSW and precharge capacity PCA are formed in boundary area BA1 located outside memory cell array ARY. Therefore, the precharge capacitor PCA can be formed regardless of the arrangement pitch of the memory cells MC. That is, the capacitance value of the precharge capacitor PCA can be set arbitrarily.
- FIG. 33 shows the read operation of the FCRAM of this embodiment.
- the word line WL62 shown in FIG. 32 is selected, and the memory cell MC force data connected to the bit lines BLO and BL1 indicated by the thick broken line frame is read out.
- the basic operation is the same as in Figure 4 above.
- the bit lines BLO and ZBLO will be described.
- the bit lines BLO and ZBLO correspond to the data lines Dl and D2 in FIG.
- the switch control signal CNT1-2 corresponds to a switch control signal for turning off the switch CS1-2 in FIG.
- Bit line reset signal BRS2 corresponds to the switch control signal for turning off switches PS1, PS2 and ESI in Fig. 4.
- the bit line reset signal BRS is deactivated to a low logic level, and the connection between the bit lines BLO, / BLO and the precharge voltage line VPR is established. Solution Removed.
- the switch control signal CNT1 corresponding to the bit line BLO from which data is output is deactivated to a low logic level (FIG. 33 (a)).
- Capacitance switch PSW connected to bit line BLO is turned off by switch control signal CNT1.
- the connection between the bit line BLO and the precharge capacitor PCA is released. Since the load capacitance value of the bit line BLO from which data is output decreases, the amount of change in the voltage of the bit line BLO due to data output increases.
- the word line WL62 is activated and data is output to the bit line BLO (FIG. 33 (b)).
- the capacitive switch PSW connected to the bit line ZBLO from which no data is output is on.
- the bit line / BLO is connected to the precharge capacitor PCA, increasing the load capacitance value. Therefore, when data is output to the bit line BLO and the voltage changes, the change due to the influence of the voltage force coupling capacitance of the bit line ZBLO is suppressed (Fig. 33 (c)). That is, the voltage difference between the bit line pair BLO and ZBLO is prevented from becoming small.
- the switch control signal CNT2 corresponding to the bit line ZBLO from which data is not output is deactivated to the low logic level (FIG. 33 (d)).
- the precharge capacitor PCA corresponding to the bit line / BLO from which no data is output is disconnected from the bit line / BLO.
- the sense amplifier SA operates to amplify the voltage difference between the bit line pair BLO and ZBLO (FIG. 33 (e)).
- the word line WL62 is deactivated, the amplification operation of the sense amplifier SA is completed (FIG. 33 (f)).
- bit line reset signal BRS and switch control signal CNT1-2 are activated (Fig. 33 (g)).
- bit line pair BLO, ZBLO is precharged to the precharge voltage line VPR (Fig. 33 (h)). Then, the read operation is completed.
- FIG. 34 shows a test command sequence when changing the off timing of the switch control signal corresponding to the bit line to which no data is output. This is the same as Figure 11 except that the address signal RAD assignment is different.
- the command decoder 12B uses one of the timing adjustment signals TADJO-6 according to the test code CODE supplied with the test command. Activate one of them at a high logic level.
- the deactivation timing (off timing) of the switch control signal CN corresponding to the bit line to which no data is output is changed by the test code CODE.
- the timing changing circuit 46a shown in FIG. 35 can adjust the OFF timing of the switch control signal CNT only in the test mode.
- the command input circuit 10 and the address input circuit 16 operate as a command input circuit that receives a timing change command for changing the OFF timing of the switch control signal CNT (CNT1 or CNT2).
- the reserved address signal RAD4-3 can be used to change the timing of other signals that control the precharge operation such as the bit line reset signal BRS.
- the off timing adjusted during the test mode is maintained until the FCRAM power is turned off or the off timing is adjusted again by the test command.
- FIG. 35 shows a timing change circuit 46a that generates a timing signal CNTF1 that determines the OFF timing of the switch control signal CNT in the precharge control circuit 46 shown in FIG.
- the timing changing circuit 46a includes a nother circuit 26b, four delay circuits 26c connected in cascade, a buffer circuit 26b, a selection circuit 26d, and a signal generation circuit 46b.
- the nother circuit 26b, the delay circuit 26c, and the selection circuit 26d are the same as those in the fourth embodiment (FIG. 12).
- the signal generation circuit 46b receives the timing signal BLTF0-1 to generate the switch control signal CNT1-2. However, when the timing adjustment signal TA DJ5 is activated, the signal generation circuit 46b generates a switch control signal (one of CNT1-2) corresponding to the bit line (one of BL, / BL) from which no data is output. Fix to ground voltage VSS. At this time, the corresponding capacitance switch PSW is always off, and the corresponding bit line is not connected to the precharge voltage line VPR. That is, the corresponding bit line is maintained in a state where the load capacitance is not connected.
- the signal generation circuit 46b switches the switch control signal (C) corresponding to the bit line (one of BL and ZBL) from which data is not output. Fix NT1—2) to the internal power supply voltage VII.
- the corresponding capacitance switch ⁇ SW is always turned on, and the corresponding bit line is always connected to the precharge voltage line VPR. That is, the corresponding bit line is maintained in a state where the load capacitance is always connected.
- FIG. 36 shows a fourteenth embodiment of the present invention.
- the same elements as those described in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.
- a command decoder 12C and a memory core 24 ⁇ are formed instead of the command decoder 12 ⁇ and the memory core 24 ⁇ of the thirteenth embodiment (Fig. 31).
- a fuse circuit 34 ⁇ is newly formed.
- Other configurations are the same as those in the thirteenth embodiment. That is, the semiconductor integrated circuit of this embodiment is formed as FCRAM.
- the command decoder 12C activates one of the timing adjustment signals TADJO-4 to a high logic level according to the test code (row address signal RAD) supplied with the test command (default is TADJ2 ), Output redundant word enable signal RWLEN.
- the redundant word enable signal RWLEN is a signal that determines whether or not the precharge capacitor PC shown in FIG. 37, which will be described later, is used as a redundant memory cell.
- the fuse circuit 34A has a fuse FS.
- the fuse circuit 34A outputs a low logic level fuse signal FSO when the fuse FS is cut (programmed), and outputs a high logic level fuse signal FSO when the fuse FS is not cut. That is, the fuse signal FSO indicates the program state of the fuse FS.
- the fuse signal FSO is a signal that determines whether or not the precharge capacitor PC shown in FIG. 37 is used as a redundant memory cell.
- the fuse signal FS0 takes precedence over the redundant word enable signal RWLEN.
- the memory core 24B includes a precharge control circuit 48 and a row decoder RDEC2 instead of the precharge control circuit 46 and the row decoder RDEC of the thirteenth embodiment.
- a plurality of precharge capacitor units PC memory cell array ARY are formed for each bit line BL, / BL.
- the memory core 24B includes a precharge control circuit 48 and a port. This is the same as the memory core 24A of the thirteenth embodiment except for the function of the decoder RDEC2. That is, each sense amplifier SA is connected only to a pair of bit lines BL and ZBL.
- the row decoder RDEC2 When the row decoder RDEC2 receives the activation of the redundant word enable signal RWLEN, the row decoder RDEC2 switches the decoding function in order to use a part of the precharge capacitor unit PC as a redundant memory cell. When the row decoder RDEC2 receives a low logic level fuse signal FS0, the row decoder RDEC2 uses a part of the precharge capacitor PC as a redundant memory cell regardless of the logic level of the redundancy word enable signal RWLEN. Switch the decoding function.
- the precharge control circuit 48 has a function of controlling a plurality of precharge capacitance units PC. In addition, the precharge control circuit 48 has a function of changing the inactive timing of the switch control signal CNT1-2 in accordance with the timing adjustment signal TADJO-6, as in the thirteenth embodiment. .
- the precharge control circuit 48 receives the activation of the redundant word enable signal RWLEN, the precharge control circuit 48 stops supplying the switch control signal CNT1-2 to a part of the precharge capacitor PC. That is, the precharge control circuit 48 also functions as a switch selection circuit that sets the number of precharge capacitors PCA (FIG. 37) used as a load in accordance with the redundant word enable signal RWLEN.
- the precharge control circuit 48 When the precharge control circuit 48 receives the low logic level fuse signal FSO, the precharge control circuit 48 controls the switch to a part of the precharge capacitor PC regardless of the logic level of the redundant word enable signal RWLEN. Stop supplying signal CNT1-2.
- the other functions of the precharge control circuit 48 are the same as those of the precharge control circuit 46. That is, the precharge control circuit 48 has the same timing changing circuit 46a as in FIG.
- FIG. 37 shows a main part of the memory core 24B shown in FIG.
- Each precharge capacitor portion PC is formed using a memory cell MC.
- the capacity switch PSW is configured using the transfer transistor of the memory cell MC
- the precharge capacity PCA is configured using the capacity of the memory cell MC. Therefore, for example, an already designed memory cell array ARY can be used.
- a pair of capacitance switch PSW and precharge capacitance PCA are formed for each bit line BL, ZBL.
- high logic level from command decoder 12C When the redundant word enable signal RWLEN is output, or when the fuse circuit 34A force is also output a low logic level fuse signal FSO, one of the capacitance switches PSW and one of the precharge capacitors PCA are redundant. Used as a memory cell. At this time, the gate of the capacitive switch PSW used as the redundant memory cell is disconnected from the signal line of the switch control signal CNT1-2 and connected to the redundant word line RWL1-2.
- FIG. 38 shows a test command sequence when changing the off timing of the switch control signal corresponding to the bit line to which no data is output.
- the command decoder 12C activates the redundant word enable signal RWLEN to a high logic level when the address signal RAD4-3 is "00".
- the other assignments of the address signal RAD are the same as in Figure 34.
- the reserved address signal RAD4-3 can be used to change the timing of other signals that control the precharge operation such as the bit line reset signal BRS.
- the off timing adjusted during the test mode is maintained until the FCRAM power is turned off or the off timing is adjusted again by the test command.
- the layout design of the memory core 24B can be facilitated by forming the capacitor switch PSW and the precharge capacitor PCA using the memory cell MC. Since the number of precharge capacitors PCA connected to each bit line BL, / BL can be changed, optimum read operation characteristics can be obtained for each manufactured FCRAM. In other words, since the layout data of the already designed memory cell array ARY can be used, the design efficiency of FCRAM can be improved. Since the unused precharge capacitor PCA can be used as a redundant memory cell, the defective relief efficiency can be improved and the yield of FCRAM can be improved.
- FIG. 39 shows a fifteenth embodiment of the present invention.
- a memory core 24C is formed instead of the memory core 24A of the thirteenth embodiment (FIG. 31).
- Other configurations are the same as those in the thirteenth embodiment. That is, the semiconductor integrated circuit of this embodiment is formed as FCRAM.
- the command input circuit 10 and the address input circuit 16 operate as a command input circuit that receives a timing change command for changing an OFF timing of a switch control signal CNT (CNT1 or CNT2) described later.
- the test command sequence is the same as in Figure 34 above.
- the memory core 24C has a precharge control circuit 50 instead of the precharge control circuit 46 of the thirteenth embodiment.
- each sense amplifier SA is connected only to a pair of bit lines BL and ZBL.
- the precharge control circuit 50 is different from the precharge control circuit 46 in the function of controlling the precharge capacitor unit PC and the precharge unit PRE. Other functions of the precharge control circuit 50 are the same as those of the precharge control circuit 46.
- FIG. 40 shows a main part of the memory core 24C shown in FIG.
- the memory core 24C is the same as the memory core 24A (FIG. 32) of the thirteenth embodiment except that the circuit configuration of the precharge unit PRE is different.
- the gates of nMOS transistors precharge switches
- the gates of the equalizing nMOS transistors that connect the bit line pair BL and ZBL to each other receive the bit line reset signal BRS12 having the AND logic of the bit line reset signal BRS1-2.
- the precharge capacitor PCA is used as a load connected to the bit lines BL and ZBL.
- FIG. 41 shows the read operation of the FCRAM of this embodiment.
- the node line WL62 force is selected, and the memory cell MC force data connected to the bit lines BL0 and BL1 indicated by the thick dashed frame in FIG. 40 is read.
- the basic operation is the same as in Fig. 5 above.
- description will be given focusing on the bit lines BL0 and ZBL0.
- the details of the waveforms of the bit lines BL0 and ZBL0 from the activation of the word line WL62 to the start of the amplification operation of the sense amplifier SA are the same as in FIG. 6 (d).
- the bit lines BL0 and ZBL0 correspond to the data lines Dl and D2 in FIG.
- Switch control signal CNT2 and bit line reset signal BRS2 Corresponds to the switch control signal for turning off switch CS2 and switch PS2 in Fig. 6.
- bit line reset signal BRS1 is deactivated to a low logic level, and the connection between the bit line BLO for outputting data and the precharge voltage line VPR is established. Canceled.
- bit line reset signal BRS1 is deactivated to a low logic level, and the equalization operation of the bit line pair BLO and ZBLO is stopped.
- the switch control signal CNT1 corresponding to the bit line BLO from which data is output is deactivated to the low logic level (Fig. 41 (a)).
- Capacitance switch PSW connected to bit line BLO is turned off by switch control signal CNT1. As a result, the connection between the bit line BLO and the precharge capacitor PCA is released. This release reduces the load capacitance value of the bit line BLO from which data is output, so that the amount of change in the voltage of the bit line BLO due to data output increases.
- the word line WL62 is activated and data is output to the bit line BLO (FIG. 41 (b)).
- the capacitive switch PSW connected to the bit line ZBLO from which no data is output is on.
- the bit line / BLO is connected to the precharge capacitor PCA, increasing the load capacitance value. Therefore, when data is output to the bit line BLO and the voltage changes, the change due to the influence of the voltage force coupling capacitance of the bit line ZBLO can be suppressed (Fig. 41 (c)). That is, the voltage difference between the bit line pair BLO and ZBLO is prevented from becoming small.
- the switch control signal CNT2 is deactivated to a low logic level before the sense amplifier SA starts an amplification operation (FIG. 41 (d)).
- Capacitance switch PSW connected to bit line ZBLO where no data is output is turned off by the deactivation of switch control signal CNT2. Since the connection between the bit line ZBLO and the precharge capacitor PCA is released, the load capacitance value of the bit line ZBLO decreases.
- the bit line ZBLO is connected to the precharge voltage line VPR by the high logic level of the bit line reset signal BRS2.
- bit line ZBLO Since the load capacitance value of the bit line ZBLO is small, the voltage of the bit line ZBLO quickly decreases to the precharge voltage VPR (corresponding to the reference voltage VREF) as shown in Fig. 6 (d).
- the bit line reset signal BRS2 corresponding to the bit line ZBLO from which no data is output is deactivated to a low logic level (FIG. 41 (e) ).
- the bit line ZBLO charged to the precharge voltage VPR is set to the floating state.
- the sense amplifier SA operates to amplify the voltage difference between the bit line pair BLO and ZBLO (FIG. 41 (f)). Since the subsequent operation is the same as that in FIG. 33 described above, the description thereof is omitted. As described above, also in this embodiment, the same effect as that of the above-described embodiment can be obtained. In particular, the same effects as those of the third embodiment can be obtained.
- FIG. 42 shows a sixteenth embodiment of the present invention.
- the same elements as those described in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.
- a memory core 24D is formed instead of the memory core 24B of the fourteenth embodiment (FIG. 36).
- Other configurations are the same as those in the fourteenth embodiment. That is, the semiconductor integrated circuit of this embodiment is formed as FCRAM.
- the memory core 24D has a precharge control circuit 52 instead of the precharge control circuit 48 of the fourteenth embodiment.
- the memory core 24D is the same as the memory core 24B of the fourteenth embodiment except for the precharge control circuit 50 and the precharge circuit PRE shown in FIG. 43 described later. That is, each sense amplifier SA is connected only to a pair of bit lines BL and / BL.
- the precharge control circuit 52 has a function of generating the bit line reset signals BRS11-2 and BRS12. Other functions are the same as those of the precharge control circuit 48 of the fourteenth embodiment.
- FIG. 43 shows a main part of the memory core 24D shown in FIG.
- the memory core 24D is different from the fourteenth embodiment (FIG. 37) only in the configuration of the precharge circuit PRE. That is, a plurality of precharge capacitor portions PC are formed for each of the bit lines BL and ZBL.
- the capacity switch PSW is configured using the transfer transistor of the memory cell MC
- the precharge capacity PC A is configured using the capacity of the memory cell MC.
- the precharge circuit PRE is the same as that in the fifteenth embodiment (FIG. 40).
- the operation of the precharge circuit PRE is the same as that of the fifteenth embodiment (FIG. 41).
- a part of the precharge capacitor PC can be used as a redundant memory cell. As described above, also in this embodiment, the same effect as that of the above-described embodiment can be obtained.
- FIG. 44 shows the main parts of the memory core in the seventeenth embodiment of the present invention.
- the memory cell array ARY of the thirteenth embodiment (FIG. 31) is replaced with a memory cell array ARY having a bit line twist structure.
- the bit line twist structure has an intersection CRS where the bit lines BL and ZBL intersect each other.
- the precharge capacitor portion PC is arranged on both sides of the intersection CRS. Note that the memory cell array ARY having the bit line twist structure can also be applied to the fourteenth to sixteenth embodiments.
- the same effects as those of the above-described embodiment can be obtained. Furthermore, by disposing the precharge capacitor part PC on both sides of the intersection CRS, the operation of each precharge capacitor part PC can be easily controlled. In addition, even when the bit lines BL and ZBL are long, the precharge control of the bit lines BL and ZBL can be reliably performed.
- the method of the mode register of the fifth embodiment is applied to the thirteenth to seventeenth embodiments, and the deactivation timing of the switch control signal CNT2 is set according to the value set in the mode register. It may be changed. Similarly, in the fourteenth and sixteenth embodiments, the number of precharge capacitors PCA used as loads may be set by a mode register.
- Pads and timing decoders similar to those in the sixth embodiment (Fig. 17) are formed in the thirteenth to seventeenth embodiments, and the deactivation timing of the switch control signal CNT2 is set in the mode register. You may change according to the value to be done. Similarly, in the fourteenth and sixteenth embodiments, the number of precharge capacitors PCA used as a load may be set by a pad and a timing decoder.
- the same fuse circuit and timing decoder as in the seventh embodiment are formed, and the deactivation timing of the switch control signal CNT2 is set in the mode register. You can change it according to the value.
- the timing variations of the fourth and fifth embodiments are changed. Additional circuits 26a, 28a may be applied. Alternatively, the timing change circuits 36a, 37a, 40a, 41a, 44a of the eighth and twelfth embodiments may be applied. That is, in the fourteenth and seventeenth embodiments, the deactivation timing of the switch control signal CNT is selectively used for a plurality of delay stages in which at least one of the channel length L and the gate width W is different. You may adjust it. The deactivation timing of the switch control signal CNT may be adjusted by changing the substrate voltage supplied to the substrate of the transistor of the delay circuit. Alternatively, adjust the deactivation timing of the switch control signal CNT by changing the power supply voltage supplied to the delay circuit.
- the MCP (FIG. 13) of the fourth embodiment may be configured using the semiconductor integrated circuit chips of the first to third, fifth, and seventeenth embodiments.
- the SOC (FIG. 16) of the fifth embodiment may be configured using the semiconductor integrated circuits of the first, fourth, sixth, and seventeenth embodiments.
- the present invention is applicable not only to precharge control of the bit lines BL and / BL connected to the sense amplifier SA, but also to precharge control of the local data bus line LDB connected to the read amplifier RA. Alternatively, it can be applied to a logic chip having a differential amplifier and a complementary data line connected to the differential amplifier.
- the present invention can be applied to general DRAM, SDRAM, or pseudo-SRAM that is not limited to FCRAM.
- the present invention can be applied to a semiconductor integrated circuit having a differential amplifier and a complementary data line connected to the differential amplifier.
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Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
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KR1020087006657A KR100932724B1 (ko) | 2005-09-09 | 2005-09-09 | 반도체 집적 회로 |
PCT/JP2005/016645 WO2007029333A1 (ja) | 2005-09-09 | 2005-09-09 | 半導体集積回路 |
CN200580051488XA CN101258556B (zh) | 2005-09-09 | 2005-09-09 | 半导体集成电路 |
EP05782355A EP1933326B1 (en) | 2005-09-09 | 2005-09-09 | Semiconductor integrated circuit |
JP2007534227A JP4627318B2 (ja) | 2005-09-09 | 2005-09-09 | 半導体集積回路 |
DE602005021554T DE602005021554D1 (de) | 2005-09-09 | 2005-09-09 | Integrierte halbleiterschaltung |
US12/044,437 US7505346B2 (en) | 2005-09-09 | 2008-03-07 | Semiconductor integrated circuit |
Applications Claiming Priority (1)
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PCT/JP2005/016645 WO2007029333A1 (ja) | 2005-09-09 | 2005-09-09 | 半導体集積回路 |
Related Child Applications (1)
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US12/044,437 Continuation US7505346B2 (en) | 2005-09-09 | 2008-03-07 | Semiconductor integrated circuit |
Publications (1)
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WO2007029333A1 true WO2007029333A1 (ja) | 2007-03-15 |
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PCT/JP2005/016645 WO2007029333A1 (ja) | 2005-09-09 | 2005-09-09 | 半導体集積回路 |
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US (1) | US7505346B2 (ja) |
EP (1) | EP1933326B1 (ja) |
JP (1) | JP4627318B2 (ja) |
KR (1) | KR100932724B1 (ja) |
CN (1) | CN101258556B (ja) |
DE (1) | DE602005021554D1 (ja) |
WO (1) | WO2007029333A1 (ja) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
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US7782697B2 (en) * | 2007-04-24 | 2010-08-24 | Novelics, Llc. | DRAM with hybrid sense amplifier |
JP2010182350A (ja) * | 2009-02-03 | 2010-08-19 | Renesas Electronics Corp | 半導体記憶装置 |
US8238183B2 (en) * | 2009-09-15 | 2012-08-07 | Elpida Memory, Inc. | Semiconductor device and data processing system comprising semiconductor device |
US9003255B2 (en) * | 2011-07-01 | 2015-04-07 | Stmicroelectronics International N.V. | Automatic test-pattern generation for memory-shadow-logic testing |
US8498169B2 (en) * | 2011-09-02 | 2013-07-30 | Qualcomm Incorporated | Code-based differential charging of bit lines of a sense amplifier |
TWI512758B (zh) * | 2012-01-18 | 2015-12-11 | United Microelectronics Corp | 記憶體裝置以及讀取位元線的電壓判讀方法 |
CN103456353A (zh) * | 2013-09-04 | 2013-12-18 | 东南大学 | 一种用于sram亚阈值地址解码器的驱动电路 |
US10388361B1 (en) | 2018-03-13 | 2019-08-20 | Micron Technology, Inc. | Differential amplifier schemes for sensing memory cells |
US11640841B2 (en) * | 2021-06-30 | 2023-05-02 | Microsoft Technology Licensing, Llc | Memory systems including memory arrays employing column read circuits to control floating of column read bit lines, and related methods |
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- 2005-09-09 EP EP05782355A patent/EP1933326B1/en not_active Expired - Fee Related
- 2005-09-09 WO PCT/JP2005/016645 patent/WO2007029333A1/ja active Application Filing
- 2005-09-09 KR KR1020087006657A patent/KR100932724B1/ko active IP Right Grant
- 2005-09-09 JP JP2007534227A patent/JP4627318B2/ja not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
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JP4627318B2 (ja) | 2011-02-09 |
CN101258556A (zh) | 2008-09-03 |
EP1933326A1 (en) | 2008-06-18 |
US20080151668A1 (en) | 2008-06-26 |
KR20080045224A (ko) | 2008-05-22 |
US7505346B2 (en) | 2009-03-17 |
DE602005021554D1 (de) | 2010-07-08 |
EP1933326A4 (en) | 2009-07-01 |
EP1933326B1 (en) | 2010-05-26 |
CN101258556B (zh) | 2010-09-15 |
KR100932724B1 (ko) | 2009-12-21 |
JPWO2007029333A1 (ja) | 2009-03-26 |
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