WO2006025083A1 - 半導体装置、半導体装置の試験方法およびデータ書き込み方法 - Google Patents
半導体装置、半導体装置の試験方法およびデータ書き込み方法 Download PDFInfo
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- WO2006025083A1 WO2006025083A1 PCT/JP2004/012475 JP2004012475W WO2006025083A1 WO 2006025083 A1 WO2006025083 A1 WO 2006025083A1 JP 2004012475 W JP2004012475 W JP 2004012475W WO 2006025083 A1 WO2006025083 A1 WO 2006025083A1
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C29/00—Checking stores for correct operation ; Subsequent repair; Testing stores during standby or offline operation
- G11C29/02—Detection or location of defective auxiliary circuits, e.g. defective refresh counters
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C16/00—Erasable programmable read-only memories
- G11C16/02—Erasable programmable read-only memories electrically programmable
- G11C16/06—Auxiliary circuits, e.g. for writing into memory
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C16/00—Erasable programmable read-only memories
- G11C16/02—Erasable programmable read-only memories electrically programmable
- G11C16/06—Auxiliary circuits, e.g. for writing into memory
- G11C16/10—Programming or data input circuits
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C16/00—Erasable programmable read-only memories
- G11C16/02—Erasable programmable read-only memories electrically programmable
- G11C16/06—Auxiliary circuits, e.g. for writing into memory
- G11C16/10—Programming or data input circuits
- G11C16/12—Programming voltage switching circuits
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C29/00—Checking stores for correct operation ; Subsequent repair; Testing stores during standby or offline operation
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C29/00—Checking stores for correct operation ; Subsequent repair; Testing stores during standby or offline operation
- G11C29/02—Detection or location of defective auxiliary circuits, e.g. defective refresh counters
- G11C29/021—Detection or location of defective auxiliary circuits, e.g. defective refresh counters in voltage or current generators
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C29/00—Checking stores for correct operation ; Subsequent repair; Testing stores during standby or offline operation
- G11C29/02—Detection or location of defective auxiliary circuits, e.g. defective refresh counters
- G11C29/028—Detection or location of defective auxiliary circuits, e.g. defective refresh counters with adaption or trimming of parameters
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C29/00—Checking stores for correct operation ; Subsequent repair; Testing stores during standby or offline operation
- G11C29/04—Detection or location of defective memory elements, e.g. cell constructio details, timing of test signals
- G11C29/50—Marginal testing, e.g. race, voltage or current testing
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C29/00—Checking stores for correct operation ; Subsequent repair; Testing stores during standby or offline operation
- G11C29/04—Detection or location of defective memory elements, e.g. cell constructio details, timing of test signals
- G11C29/50—Marginal testing, e.g. race, voltage or current testing
- G11C29/50004—Marginal testing, e.g. race, voltage or current testing of threshold voltage
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C16/00—Erasable programmable read-only memories
- G11C16/02—Erasable programmable read-only memories electrically programmable
- G11C16/04—Erasable programmable read-only memories electrically programmable using variable threshold transistors, e.g. FAMOS
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C29/00—Checking stores for correct operation ; Subsequent repair; Testing stores during standby or offline operation
- G11C29/04—Detection or location of defective memory elements, e.g. cell constructio details, timing of test signals
- G11C29/50—Marginal testing, e.g. race, voltage or current testing
- G11C2029/5004—Voltage
Definitions
- the present invention relates to a semiconductor device, a test method, and a data writing method.
- Semiconductor memories are broadly classified into volatile types in which information is lost when the power is erased and non-volatile types in which information is retained even when the power is turned off.
- volatile types in which information is lost when the power is erased
- non-volatile types in which information is retained even when the power is turned off.
- flash memory is known in which data erasure is performed simultaneously to shorten the rewrite time. The followings have been proposed as such flash memories that are not affected by variations from device to device.
- the device described in Patent Document 1 finds an optimum writing condition such as a program width at the time of an operation test, stores the information in the chip, and the control circuit stores the information at the time of normal operation. It is accessed and operated under chip-specific programming conditions.
- the apparatus described in Patent Document 2 sets a voltage increase width at the time of step programming for each chip in the writing means.
- FIG. 1 is a diagram showing a threshold distribution in a multilevel memory cell.
- the horizontal axis represents the threshold value
- the vertical axis represents the number of bits.
- Output (or input) data Even when level 4 data is written, a writing method that reaches level 4 through levels 1, 2, and 3 is generally used.
- Patent Document 1 Japanese Published Patent Publication JP 2002-197880
- Patent Document 2 Japanese Published Patent Publication JP 2003-223791
- the range of the threshold Vth is Ov If it is about 8v, in order to realize the 4 values, the distribution per value must be kept within about lv. To keep the distribution in such a very narrow area, a very precise write operation must be realized. In order to realize this precise writing operation, it is necessary to find an optimum writing condition.
- Patent Document 1 the device described in Patent Document 1 is to find an optimum writing condition such as a program width at the time of an operation test, but how to actually set the optimum writing condition such as a program width. It is not specifically disclosed whether to find out.
- the device described in Patent Document 2 sets the voltage increase width at the time of step programming for each chip, but how to find the optimum voltage increase width is specifically disclosed. Not.
- an object of the present invention is to provide a semiconductor device, a test method, and a data write method that can solve the above-described conventional problems and find an optimum condition of a write voltage.
- the present invention provides a latch circuit that latches an externally input signal in a test mode, and a write operation to a memory cell in accordance with the signal latched in the latch circuit. And a generation circuit that generates a signal that defines a write voltage to be used. According to the present invention, it is possible to easily find the optimum condition of the write voltage by internally generating the write voltage used at the time of writing the memory cell using the signal input from the outside in the test mode. By using this optimum write voltage during normal operation, precise write operation can be realized.
- the generation circuit may include a circuit that generates a signal defining an initial voltage of the write voltage. According to the present invention, it is possible to easily find the optimum condition of the initial voltage of the write voltage by internally generating a signal that defines the initial voltage of the write voltage using the signal input from the outside in the test mode. it can. By using the initial voltage of this optimum write voltage during normal operation, it is possible to realize precise write operation.
- the generation circuit generates a signal that defines a pulse width of the write voltage. It can be set as the structure containing. According to the present invention, an optimum condition for the pulse width of the write voltage can be found by internally generating a signal defining the pulse width of the write voltage using a signal input from the outside in the test mode. By using a write voltage with this optimum pulse width during normal operation, a precise write operation can be realized.
- the generation circuit can include a circuit that generates a signal that defines a step width of the write voltage.
- an optimum condition for the step width of the write voltage can be found by generating a signal that defines the step width of the write voltage using a signal input from the outside in the test mode. In normal operation, a precise write operation can be realized by using a write voltage with an optimal step width.
- the generation circuit includes a circuit that generates a signal that defines a step width of the write voltage when the write voltage is a write voltage that increases stepwise, and the semiconductor device is further generated by the circuit It is possible to construct a configuration including a voltage control circuit in which a switch for selecting a predetermined capacity is controlled by a signal that defines a step width of a write voltage to be applied. According to the present invention, it is possible to generate a write voltage having an optimum step width.
- the latch circuit is connected to a predetermined address terminal, and the signal input from the outside can be an address signal input via the address terminal. According to the present invention, a write voltage can be generated internally by using an address signal input from the outside in the test mode.
- a sense amplifier circuit that outputs verify data from cell data read from the memory cell during a predetermined verify period, and an output that outputs the verify data from the sense amplifier circuit to the outside And a circuit.
- the test mode it is possible to find the optimum condition of the write voltage by determining the write state to the memory cell externally. By using this optimum write voltage during normal operation, a precise write operation can be realized.
- the latch circuit may be configured to latch a signal input from the outside in accordance with a type of a signal that defines the write voltage. According to the present invention, it is possible to increase the number of write voltage variations by changing the number of latched signals.
- a nonvolatile memory (Content that stores the signal latched in the latch circuit)
- the signal latched in the latch circuit is stored in the non-volatile memory, so that the signal specifying the write voltage based on the signal stored in the non-volatile memory after shipment. Can be generated. This makes it possible to achieve a precise write operation using the optimum write voltage during normal operation.
- the semiconductor device further generates a signal that defines the write voltage based on a nonvolatile memory that stores a signal latched in the latch circuit and a signal stored in the nonvolatile memory. And a control circuit.
- the signal latched in the latch circuit is stored in the nonvolatile memory, and after shipment, the signal that defines the write voltage is generated based on the signal stored in the nonvolatile memory. I can do it. As a result, a precise write operation can be realized using an optimum write voltage during normal operation.
- the memory cell is, for example, a memory cell having a plurality of different threshold values. According to the present invention, it is possible to realize a write operation efficiently and effectively without causing overprogramming in a multi-level flash memory.
- the write voltage may be a write voltage that increases stepwise for each level of a plurality of memory cells having different threshold values. According to the present invention, even when writing by the ramp gate program method, the writing operation can be realized efficiently and effectively so as not to cause over programming.
- the present invention defines a step of latching an externally input signal in the test mode, and a write voltage used when writing to the memory cell using the latched signal. And a generation step of generating a signal. According to the present invention, it is possible to easily find the optimum condition of the write voltage by internally generating the write voltage used when writing the memory cell using, for example, an address signal input from the outside in the test mode. By using this optimum write voltage during normal operation, precise write operation can be realized.
- the generation step may include a step of generating a signal that defines an initial voltage of the write voltage. According to the present invention, it is possible to easily find the optimum condition of the initial voltage of the write voltage by internally generating a signal defining the initial voltage of the write voltage using the signal input from the outside in the test mode. be able to. By using the initial voltage of this optimum write voltage during normal operation, it is possible to realize a precise write operation.
- the generation step may include a step of generating a signal that defines a pulse width of the write voltage. According to the present invention, it is possible to find the optimum condition of the write voltage pulse width by internally generating a signal that defines the write voltage pulse width using a signal input from the outside in the test mode. . By using the write voltage with this optimal pulse width during normal operation, it is possible to achieve precise write operation.
- the generation step may include a step of generating a signal defining a step width of the write voltage.
- the optimum condition for the step width of the write voltage can be found by generating a signal for defining the step width of the write voltage using a signal input from the outside in the test mode.
- the present invention provides a write circuit that writes data of a plurality of levels to a plurality of memory cells having different threshold values, and a generation that generates a signal that defines a write voltage that increases stepwise for each level.
- a semiconductor device including a circuit is provided. According to the present invention, by generating a signal for defining the write voltage used in the ramp gate program method for each level, an optimum write voltage condition is set in the write operation at each level. Therefore, the writing time can be shortened.
- the generation circuit may include a circuit that generates a signal defining a step width of the write voltage for each level. According to the present invention, the write time can be shortened by setting the optimum write voltage step width for each level.
- the generation circuit may include a circuit that generates a signal defining a pulse width of the write voltage for each level. According to the present invention, the write time can be shortened by setting the write voltage with the optimum pulse width for each level.
- the generation circuit When the last level of the plurality of levels is a write target, the generation circuit generates a signal that defines a write voltage having a pulse width longer than a write voltage used at another level; can do.
- the write operation when the last level of a plurality of levels is to be written, the write operation is performed using a write voltage having a pulse width longer than the write voltage used at the other level, so that At the last level, the programming time can be reduced while preventing overprogramming at the last level.
- the detection circuit includes a detection circuit that detects that the write voltage has reached a predetermined voltage, and the generation circuit uses the detection circuit when the last level of the plurality of levels is to be written. After detecting that the write voltage has reached a predetermined voltage, it may be configured to include a circuit that generates a signal that defines a write voltage having a pulse width longer than the write voltage used at other levels. According to the present invention, at the last level, the write operation is performed while increasing the write voltage in a stepwise manner up to the predetermined level, and after exceeding the predetermined level, the write voltage used at other levels is higher than the write voltage used at other levels. By performing the write operation using a write voltage with a long pulse width, the write time at the last level can be shortened.
- the generation circuit corresponds to a latch circuit that latches a write voltage at a predetermined timing, and a write voltage latched in the latch circuit Based on the initial write voltage. And a circuit for generating a signal for defining a second level write voltage next to the first level.
- the write operation according to the device characteristics is realized and the write time is shortened by generating a signal that defines the write voltage of the next level in consideration of the write voltage of the previous level. Can do.
- the predetermined timing is a timing at which a predetermined program verify for the first level is passed.
- the generation circuit is, for example, a control circuit that controls the write circuit. According to the present invention, it is possible to generate a signal that defines a write voltage that increases stepwise for each level within the control circuit.
- the present invention controls a write circuit that writes data of a plurality of different levels to a multi-level memory cell and the write circuit, and the last level of the plurality of levels is a write target.
- a semiconductor device including a control circuit that executes a write operation using a write voltage having a pulse width longer than that of a write voltage used at another level.
- the write operation is performed using a pulse width longer than the write voltage used for the other level and the write voltage.
- the present invention controls a writing circuit that writes data of a plurality of different levels to a multi-level memory cell and the writing circuit, and the last level of the plurality of levels is to be written.
- a semiconductor device including a control circuit that executes a write operation while increasing the write voltage stepwise without performing a verify operation until the write voltage reaches a predetermined voltage.
- the write voltage is increased in steps without performing the verify operation until the write voltage reaches a predetermined voltage. By performing the operation, the time required for the last level write operation can be significantly reduced.
- a detection circuit that detects that the write voltage has reached a predetermined voltage is included, and the control circuit sets the write voltage when the last level of the plurality of levels is to be written. Step the write voltage until a predetermined voltage is reached After the write voltage reaches a predetermined voltage, the write operation is performed using a write voltage having a pulse width longer than the write voltage used at other levels. It can be configured. According to the present invention, the write operation is executed while increasing the write voltage stepwise until the write voltage reaches a predetermined voltage. After reaching the write voltage, the write voltage used at another level is reached. By executing the write operation using a write voltage having a pulse width longer than the voltage, the write time at the last level can be shortened.
- the present invention relates to a write circuit for writing a plurality of levels of data in memory cells having a plurality of different threshold values, and to control the write circuit to write a first level of the plurality of levels.
- the first write operation is executed while increasing the write voltage stepwise, the write voltage at a predetermined timing is stored while the first write operation is executed, and the first voltage next to the first level is stored.
- a semiconductor device including a control circuit for performing a second write operation while increasing an initial write voltage corresponding to the stored write voltage in a stepwise manner with two levels as write targets. According to the present invention, by performing the next level write operation in consideration of the previous level write voltage, the write time can be shortened without useless write operation.
- a latch circuit that latches the write voltage at the predetermined timing is included.
- the predetermined timing is, for example, a timing at which a predetermined program verify for the first level is passed.
- the semiconductor device is, for example, a semiconductor memory device such as a flash memory.
- the present invention provides a first step of performing writing while increasing a write voltage stepwise with a first level among a plurality of levels of a multilevel memory cell as a write target, and a predetermined step in the first step. While increasing the initial write voltage corresponding to the write voltage stored in the second step with the second step storing the write voltage of the timing and the second level next to the first level as the write target while increasing in steps.
- a data writing method including a third step of writing.
- the second write operation is performed while increasing the initial write voltage corresponding to the write voltage stored with the second level next to the first level as a write target in a stepwise manner. It is possible to shorten the setting time.
- the present invention provides a first step of performing writing while increasing a write voltage stepwise with a level other than the last level among a plurality of levels of a multi-level memory cell as a write target; And a second step of writing using a write voltage having a pulse width longer than the write voltage used in the first step with the last level as a write target.
- writing is performed while increasing the write voltage stepwise with a level other than the last level among a plurality of levels of the multi-level memory cell as a write target, thereby obtaining the last level.
- over-programming is prevented, and at the last level, writing is performed using a writing voltage having a long panoramic width, thereby significantly reducing the writing time.
- the present invention provides a first step of performing writing while increasing a write voltage stepwise with a level other than the last level among a plurality of levels of a multi-level memory cell as a write target; Data including a second step in which writing is performed while increasing the write voltage stepwise without performing a verify operation until the write voltage reaches a predetermined voltage, with the last level among the levels being written.
- a writing method when the last level of a plurality of levels is to be written, the write voltage is increased stepwise without performing the verify operation until the write voltage reaches a predetermined voltage. Executing the write operation can significantly reduce the time required for the last level write operation.
- FIG. 1 is a diagram showing a threshold distribution in a multilevel memory cell.
- FIG. 2 is a block diagram of a semiconductor device according to Example 1.
- FIG. 3 is a diagram for explaining a write operation of a ramp gate program method.
- FIG. 4 is a diagram showing a LAT generation circuit and a latch circuit provided in the test circuit.
- FIG. 5 is a timing chart when generating an address latch signal according to the first embodiment.
- FIG. 6 (a) and (b) are generation circuits for generating a signal for defining a write voltage.
- FIG. 7 is a diagram showing a WL high voltage generation circuit.
- FIG. 8 is an example of a generation circuit that generates a signal that defines a pulse width of a write voltage.
- FIG. 9 is a diagram showing the relationship between a program sequence according to Example 1, a word line WL voltage, and a bit line BL voltage.
- FIG. 10 is a block diagram of a semiconductor device according to a second embodiment.
- FIG. 11 is a diagram showing a write flow from level 1 to level 2 and a write flow from level 2 to level 3.
- FIG. 12 is a diagram showing a write flow from level 3 to level 4.
- FIG. 13 is a diagram showing a control circuit that controls write conditions in each state.
- FIG. 14 is a logic timing diagram.
- FIG. 15 is a diagram showing a generation circuit circuit 130.
- FIG. 16 is a diagram showing a WL high voltage generation circuit 2
- FIG. 17 is a diagram showing a BL high voltage generation circuit 3.
- FIG. 18 shows an internal booster circuit 201 used in the second embodiment.
- FIG. 19 is a diagram showing a high voltage conversion circuit 202 used in FIG.
- FIG. 20 is a diagram showing a shift register used in FIG.
- FIG. 21 is a timing diagram of PGM2ND in the ramp gate program.
- FIG. 22 is a timing diagram of PGM4TH in the ramp gate program.
- FIG. 2 is a block diagram of the semiconductor device 1 according to the first embodiment.
- the semiconductor device 1 includes a WL high voltage generation circuit 2, a BL high voltage generation circuit 3, a program pulse controller 4, a memory cell array 5, an X decoder 6, a Y decoder 7, Amplifier circuit 8, output circuit 9, test circuit 10, reference circuit 11, control circuit 12, and CA Ml3.
- the semiconductor device 1 may be a semiconductor storage device such as a flash memory packaged alone, or may be incorporated as a part of the semiconductor device like a system LSI.
- WL high voltage generation circuit 2 receives a control signal from test circuit 10, generates boosted voltage VPP, and provides boosted voltage VPP to X decoder 6.
- the X decoder 6 applies a word line voltage.
- the BL high voltage generation circuit 3 receives the control signal from the test circuit 10 in the test mode, generates the boost voltage VDD, and supplies the boost voltage VDD to the Y decoder 7.
- Y decoder 7 applies a bit line voltage.
- the program pulse controller 4 receives a control signal from the test circuit 10 in the test mode, and controls the applied voltage in the X decoder 6 and the Y decoder.
- the memory cell array 5 includes an array 1J of memory cell transistors having different threshold values, a node line, a bit line, and the like, and stores data in each memory cell transistor.
- data is read from the memory cell specified by the activated word line to the bit line.
- the word line and the bit line are set to appropriate potentials according to the respective operations, thereby executing charge injection or charge extraction operations on the memory cells.
- the test circuit 10 controls each test in the test mode. This test circuit 10 is latched in a latch circuit 30 that latches an externally input address signal in a test mode as shown in FIG. 4, and a latch circuit 30 as shown in FIGS. 6 (a) and 6 (b). In response to the received signal (information), generation circuits 40 and 50 that generate a signal that defines a write voltage used when writing to the memory cell are included. As a result, various write voltages can be generated internally using the address signal.
- the reference circuit 11 uses the signal latched by the latch circuit 30 to select a reference cell to be used during the verify operation from the plurality of reference cells.
- the sense amplifier circuit 8 uses the current of the cell data read from the memory cell array 5 as a reference from the reference circuit 11 according to the designation by the X decoder 6 and the Y decoder 7 during the program verification period in the test mode. Whether the data is 0 by comparing with the current, or 1 Judgment is performed, and the result of the determination is sent to the output circuit 9 as verification data.
- the output circuit 9 outputs the verification data from the sense amplifier circuit 8 to the outside.
- the pass / fail is not determined inside the chip, but the verification data is output to the outside and the determination is performed by the external tester.
- the optimum condition for the write voltage can be found by an external tester.
- the CAM 13 stores information related to the optimum write voltage latched in the latch circuit 30.
- the control circuit 12 In the normal mode after shipment, the control circuit 12 generates a signal for defining the write voltage based on the information stored in the CAM 13. As a result, the write operation can be realized using the optimum write voltage.
- FIG. 3 is a diagram for explaining the write operation of the ramp gate program method.
- the horizontal axis shows the program time and the vertical axis shows the word line voltage.
- write is performed by applying a certain initial voltage to the gate, and if it is impossible to write by this write, the gate voltage is boosted based on a certain step voltage. Then execute the next write.
- a method of writing by repeating this series of operations is generally called a ramp gate program method.
- the write voltage used in the ramp gate program method increases stepwise for each level of memory cells having different thresholds.
- step voltage if the step voltage is too high, there is a possibility that writing will be faster. If there is a cell with very fast writing, it may be overprogrammed. There is sex. Conversely, if the step voltage is too low, writing will be slow.
- program pulse width if the pulse width is too wide, the write tends to be deep, and there is a possibility of overprogramming. Also, if the width is too short, writing will be insufficient and the writing time will be long. End up. In this way, very precise writing must be realized. Therefore, a writing method must be implemented to find these conditions efficiently.
- the test circuit 10 latches several address signals when entering the test mode, and uses each of the latched addresses. Select any condition. By determining this externally, the optimum condition of the write voltage can be found. By performing the write operation using the optimal write voltage during normal operation, a precise write operation can be realized.
- FIG. 4 is a diagram showing the LAT generation circuit 20 and the latch circuit 30 provided in the test circuit 10.
- the LAT generation circuit 20 includes inverters 21 to 26 and a NAND circuit 27, and generates a latch signal LAT from the signal TMEN.
- the latch circuit 30 is a circuit that latches an address signal input from the outside in the test mode, and includes NMOS transistors 31 and 32 and inverters 33 to 36.
- the latch circuit 30 is connected to the address terminal. An address signal is input through this address terminal.
- the latch circuits 30 are provided in the same number as the number of addresses, and are configured to latch signals input from the outside in accordance with the types of signals defining the write voltage. This can increase the number of write voltage variations by changing the number of latched signals.
- FIG. 5 is a timing chart when generating an address latch signal according to the first embodiment.
- the test mode When entering the test mode, pulse the write enable signal (WE /) as shown.
- the test mode is entered by writing a code for entering the test mode from the command signal (CMD) in synchronization with this signal WE / pulse. For example, if the test mode can be entered in 4 cycles, a code is issued in the last 4 cycles, and several address signals are input at the same time.
- the signal TMEN indicating the test mode entry becomes High inside the chip.
- the delay signal of inverters 23 to 25 is received and generated as a latch signal LAT force S pulse signal. That is, the latch signal LAT is pulsed once. When this latch signal LAT is pulsed one time, it passes through transistor 31. Then, the address signal ADD is input to the latch portion composed of the inverters 34 and 35, and the address latch signal LADD is determined.
- This address latch signal LADD is input to a generation circuit to be described later, so that the initial voltage, step voltage, program pulse width, etc. can be finely adjusted.
- the signal TMEN force becomes SLow, and the latch part consisting of inverters 34 and 35 is reset.
- FIGS. 6 (a) and 6 (b) are generation circuits (decoding circuits) 40 and 50 for generating a signal for defining a write voltage.
- FIG. 6 (a) shows a case where the address latch signal LADD is 2 bits.
- the generation circuits 40 and 50 generate signals that define the initial voltage of the write voltage, the write pulse width, and the step width of the write voltage.
- the generation circuit 40 includes NAND circuits 41 to 44, and includes a latch circuit.
- the decode signal INIT (3: 0) is generated from the address latch signals LADD0, LADD1, LADDOB to LADDIB from 30.
- the signals LADDOB and LADDIB are signals obtained by inverting the address latch signals LADD0 and LADD1 from the latch circuit 30, respectively.
- the generation circuit 40 can generate a decode signal INIT (3: 0) of 4 patterns by combining a positive logic signal and a negative logic signal when 2-input NAND or NOR is used. . By using this signal INIT (3: 0), for example, an initial voltage of 4 levels can be generated.
- the generation circuit 50 includes NAND circuits 51 to 58, and includes address latch signals LADD0, LADD1, LADD2, LADDOB, LA DD1B to LADD2B from the latch circuit 30. Generates a decode signal INIT (7: 0).
- the signals LADD0B, LADD1B, and LADD2B are signals obtained by inverting the address latch signals LADD0, LADD1, and LADD2 from the latch circuit 30, respectively.
- the generation circuit 50 can generate 8 patterns of decode signals INIT (7: 0) as in the case of using 3-input NAND or NOR.
- the initial voltage can be finely adjusted based on the decoded signal INI T (7: 0).
- WL high voltage generation circuit 2 includes a voltage control circuit 60 and an internal booster circuit 70.
- transistors constituting a switch that selects a predetermined capacitance are controlled by a signal that defines the step width of the write voltage generated by the generation circuits 40 and 50.
- the PMOS transistor 61, NMOS Includes transistors 62 to 64, comparison circuit 65, selection transistors 66 to 69, capacitors CA and CB, and capacitors CC to CC8.
- the capacitance of the capacitor CCn (eg, CC4) is n XC (eg, 4C).
- the selection transistors 66 to 69 are constituted by NMOS transistors.
- the capacitors C C to CC8 are connected to the node N1 via the selection transistors 66 to 69.
- the divided voltage VPPDIV is generated by capacitively dividing the boost voltage VPP. This divided voltage VPP DIV is input to the comparator circuit 65.
- the comparison circuit 65 compares the reference voltage VREF and the divided voltage VPPDIV and outputs a signal Vout. When the divided voltage VPPDIV is higher than the reference voltage VREF, the signal Vout becomes, for example, High, and the boosted potential is too high, so that the voltage is lowered by the discharge operation.
- the decode signal INIT (3: 0) for controlling the gates of the selection transistors 66 to 69 is counted in binary, and the boosted voltage VPP increases in equal steps.
- FIG. 8 shows an example of the generation circuit 80 that generates a signal that defines the pulse width of the write voltage.
- the generation circuit 80 is a circuit that generates a signal that defines the pulse width of the write voltage, and includes circuits 81 to 91.
- the signal LADDO and the signal LADD1 are address latch signals latched by the latch circuit 30. This address latch signal becomes a trimming signal for adjusting the program pulse width.
- P0 to P6 are sub-pulse signals, which are generated by binary counter circuits (not shown) driven by internal clock signals as pulses of different lengths.
- the circuits 81 to 84 generate the pulse signals of 150 ns to 300 ns by taking the logic of the sub pulse signals P0 to P6B.
- the circuit 81 generates a pulse signal PULSEOB of 250 ns from the signals P0, Pl, P2, P3, P4, P5B, and P6B.
- Circuit 82 generates a 150 ns pulse signal PULSE1B from signals P0, Pl, P2, P3B, P4B, P5B and P6B.
- Circuit 83 uses signals P0 and PI , P2, P3, P4B, P5B and P6B generate a 200ns pulse signal PULSE2B.
- Circuit 84 generates a 300 ns pulse signal PUL SE3B from signals P0, Pl, P2, P3, P4, P5 and P6B.
- the circuit 85 includes an inverter 851 and generates a signal LADD0B from the address latch signal LADD0.
- the circuit 86 includes an inverter 861 and generates a signal LADD1B from the address latch signal LADD1.
- the circuit 87 includes an NOR circuit 871 and an inverter 872, and generates a signal PDEFAULTB from the signal LADD0 and the signal LADD1.
- the circuit 88 includes an NOR circuit 881 and an inverter 882, and generates a signal POPT1B from the signal LADD0B and the signal LADD1.
- Circuit 89 includes an N ⁇ R circuit 891 and an inverter 892, and generates signal LADD0 and signal L ADD1B, and signal POPT2B.
- Circuit 90 includes an N ⁇ R circuit 901 and an inverter 902, and generates a signal LADD0B and a signal LADD1B force, and a signal POPT3B.
- Circuit 91 includes N0R circuits 911 to 915 and inverter 916, and generates signal PDEFAUL TB, signal PULSE0B, signal ⁇ 1 ⁇ , signal PULSE2B, signal POP2B, signal PUL SE3B, signal POPT3B and signal PULSE4B force signal PGMPULSE .
- these pulse signals are enabled by the previous trimming signal and supplied to the program pulse controller 4 as the signal PGMPULSE. This controls the pulse width of the write voltage.
- FIG. 9 is a diagram showing the relationship between the program sequence according to the first embodiment, the word line WL voltage, and the bit line BL voltage.
- the program period is set with signal WE / and the verification period is set with signal OE /.
- the verify operation and program operation are repeated alternately.
- the word line voltage WL is 6v and the bit line voltage BL is 0.7v, which is a constant voltage.
- the word line voltage WL is ramped at a constant step of 4.5, 6, 7.5 v.
- the bit line voltage BL is a constant voltage of 5v.
- the program pulse width B of the bit line BL can be arbitrarily adjusted by the circuit 80 shown in FIG.
- Example 2 There are four memory cell level strengths: S Level 1, Level 2, Level 3, and Level 4, and these four levels have two outputs. Configure the (or input) data.
- Revenore 1, Rebenole 2, Revenore 3, and Level 4 are (1, 1), (0, 1), (1, 0), (0, 0) and 2 respectively. Define one input / output data.
- level 4 data is written, a writing method that reaches level 4 through levels 1 and 2 and level 3 is generally used. In this method, all cells to which level 4 is to be written are first written to the level 2 threshold Vth in the 1st write flow.
- Patent Document 3 Japanese Patent Laid-Open No. 10-241380 has been proposed.
- a ramp gate program type writing method has been proposed.
- this ramp gate programming method when writing from level 1 to level 2 in the erased state, a certain initial voltage is applied to the gate for writing, and if this writing fails, a certain step voltage is applied. First, boost the gate voltage and execute the next write. Writing is performed by repeating this series of operations. The following are proposed for such a ramp gate program.
- an object of the present invention is to provide a semiconductor device and a data writing method capable of shortening a writing time even when a writing operation is performed by a ramp gate program method. To do.
- FIG. 10 is a block diagram of the semiconductor device 100 according to the second embodiment.
- the semiconductor device 100 includes a WL high voltage generation circuit 2, a BL high voltage generation circuit 3, a program pulse controller 4, a memory cell array 5, an X decoder 6, a Y decoder 7, a sense amplifier circuit 8, Semi-IJ constant circuit 101 and control circuit 102 are included.
- the same parts as those in the above embodiment are denoted by the same reference numerals and the description thereof is omitted.
- the semiconductor device 100 may be a semiconductor memory device such as a flash memory packaged alone, or may be incorporated as a part of a semiconductor device such as a system LSI.
- WL high voltage generation circuit 2 receives a control signal from control circuit 102 and provides boosted voltage VPP to X decoder 6.
- the X decoder 6 supplies a word line voltage to the memory cells of the memory cell array 5.
- the BL high voltage generation circuit 3 receives the control signal from the control circuit 102 and supplies the boosted voltage V DD to the Y decoder 7.
- the Y decoder 7 supplies a bit line voltage to the memory cells of the memory cell array 5.
- the program node controller 4 receives the control signal from the control circuit 102 and controls the applied voltage in the X decoder 6 and the Y decoder.
- the memory cell array 5 includes an array lj of memory cell transistors, a word line, a bit line, and the like, and stores data in each memory cell transistor.
- the control circuit 102 operates as a state machine based on the logic control signal and the command, and controls the operation of each unit of the semiconductor device 100.
- the control circuit 102 controls the memory cell array 5, the X decoder 6, the ⁇ decoder 7 and the like in order to read data from the address of the memory cell array 5.
- the control circuit 102 uses the memory cell array 5, X decoder 6, Y decoder 7 and the like to write data to the write address of the memory cell array 5.
- Control controls the memory cell array 5, the X decoder 6, the Y decoder 7, and the like in order to collectively erase the designated area of the memory cell array 5 in a predetermined unit.
- the write process is executed by the control circuit 102 controlling each circuit.
- the control circuit 102 also includes a generation circuit that generates various control signals for each level that define a write voltage that increases stepwise in accordance with the threshold value Vth written to the memory cell.
- the control circuit 102 executes the write operation while increasing the write voltage stepwise until the write voltage reaches the maximum voltage. After reaching the maximum voltage, the write operation is performed using the pulse width longer than the write voltage at the other level and the write voltage.
- the control circuit 102 does not perform the verify operation until the write voltage reaches a predetermined voltage, and increases the write voltage stepwise. Execute.
- the WL high voltage generation circuit 2, the BL high voltage generation circuit 3, the X decoder 6 and the Y decoder 7 constitute a write circuit for writing data of a plurality of levels in the memory cell.
- the sense amplifier circuit 8 operates under the control of the control circuit 102, and compares the current of the cell data supplied from the memory cell array 5 with the reference current according to the designation by the X decoder 6 and the Y decoder 7. Thus, it is determined whether or not the force is 1 where the data is 0.
- the determination circuit 101 receives the verification data from the sense amplifier circuit 8, determines pass / fail, and sends the determination result to the control circuit 102.
- FIGS. 11 and 12 are diagrams showing a write flow of the multi-level memory cell which is a feature of the present invention.
- the write flow from level 1 to level 2 is defined as PGM2ND, level 2 to level 3 as PGM3RD, and level 3 to level 4 as PGM4TH.
- FIG. 11 is a diagram showing a write flow from level 1 to level 2 and a write flow from level 2 to level 3.
- Figure 12 shows the write flow from level 3 to level 4.
- Each flow is independent and has its own memory cell write condition.
- This writing condition is optimized by the control circuit 102 so that the target threshold value Vth in each flow can be written accurately and quickly.
- PGM2N In the D and PGM3RD states the ramp gate program method is adopted in which the gate voltage is gradually increased by applying a write pulse once to prevent overprogramming.
- step S101 the control circuit 102 enters an initial state called start.
- the control circuit 102 performs program verification, and at step S103, the control circuit 102 looks at the program suspend signal PSPS, and when this program suspend instruction is executed, it returns to START and writes. Do not return to START immediately after executing the command.
- step S104 when the determination in verification fails, the control circuit 102 increases the boosted voltage VPP by a small amount (lstep) in step S105 and proceeds to step S106.
- step S106 the control circuit 102 checks whether the boosted voltage VPP has been boosted the maximum number of times. If the maximum number of times, the control circuit 102 hangs. If not, the control circuit 102 proceeds to step S107 and writes to the memory cell.
- step S108 when the program suspend signal PSPS is issued and the instruction is executed, the control circuit 102 returns to step S101 and does not return to START immediately after executing the write command. If the program suspend signal PSPS is not output in step S108, the control circuit 102 proceeds to step S102 and executes the program verify eye. If the program suspend signal PSPS is not output in step S103, the control circuit 102 proceeds to step S104. In step S104, the control circuit 102 repeats the above process when the determination in the verify eye fails again. In step S104, the control circuit 102 proceeds to the next PGM3RD when the verification decision is passed.
- step S201 the control circuit 102 enters an initial state called PGM3RD start.
- step S202 the control circuit 102 performs program verification.
- step S203 the control circuit 102 returns to step S201 and does not return to START immediately after the write command is executed.
- step S204 when the determination in verification fails, the control circuit 102 increases the boosted voltage VPP by a small amount (lstep) and proceeds to step S206 in step S205.
- step S206 the control circuit 102 checks whether the boosted voltage VPP has the maximum number of boosts. If the maximum number of times, the control circuit 102 hangs. If not, the process proceeds to step S207 to write to the memory cell.
- step S208 the control circuit 102 sets the program suspend signal PSP. When S is issued and the instruction is executed, return to step S201 and do not return to START immediately after executing the write command.
- step S208 if the program suspend signal PSPS is not output, the control circuit 102 proceeds to step S202 and executes program verification. If the program suspend signal PSPS is not output in step S203, the control circuit 102 proceeds to step S204. In step S204, the control circuit 102 repeats the above process when the verification decision fails again. In step S204, the control circuit 102 proceeds to the next PGM4TH when the verification decision is passed.
- step S301 the control circuit 102 enters an initial state called PGM4TH start. In the PGM4TH state, unlike PGM2ND and PGM3RD, a slight overprogram is acceptable, so a technique to shorten the write time is used.
- step S302 the control circuit 102 performs program verification. When the program suspend signal instruction is executed in step S303, the control circuit 102 returns to step S301 and does not return to START immediately after executing the write command.
- step S304 when the MATCH judgment in the first verification fails, the control circuit 102 proceeds to step S305. In step S305, since the flag is 0 (initial state), the process proceeds to step S306 to enter the ramp gate program flow.
- step S306 the control circuit 102 slightly increases the boosted voltage VPP and proceeds to step S307.
- step S307 the control circuit 102 checks whether the boost voltage VPP has been boosted the maximum number of times, and if it is the maximum number of times, the control circuit 102 hangs because it includes a slow program bit. Write.
- the program suspend signal PSPS is issued in step S309 and the instruction is executed, the process returns to step S301 and does not return to START immediately after the write command is executed.
- step S310 the control circuit 102 checks whether or not the boosted voltage VPP is the set maximum voltage. In step S310, if the boosted voltage VPP is not the maximum voltage, the control circuit 102 does not go to the verify flow, proceeds to step S306, and enters the program flow again. The above loop is repeated, and when the boosted voltage VPP reaches the maximum voltage in step S310, the flag is still 0 in step S311 and fails. Proceed to step S312 and enter long pulse flow.
- step S313 the control circuit 102 sets a flag to 1.
- step S314 the control circuit 102 executes a write operation by applying a pulse that is much longer than usual in step S308 while maintaining the boosted voltage VPP at the maximum voltage. After applying a long pulse, the flag is set to 1, so the second verification flow is entered in step S311. In step S304, this second verification is normally passed, and the process proceeds to step S315 where the flag is set to 0 and all write operations are completed. If the second verification fails in step S304, the process proceeds to step S314 without entering the ramp gate program flow that proceeds to step S306, and directly enters the long pulse flow.
- FIG. 13 is a diagram showing the control circuit 102 that controls the write condition in each state.
- the control circuit 102 includes a counter circuit 121, a timer circuit 124, a control logic 125, and circuits 126 to 128.
- signal PGM2ND, signal PGM3RD, signal PGM4TH, and signal MAXVPP signal I NPUT (5: 0) is generated for each level.
- the control logic 125 loads the signal INPUT (5: 0) to the counter circuit 121 as the initial voltage of the gate at the time of writing.
- the counter circuit 121 is a circuit that generates a signal defining the initial voltage and step width of the write voltage for each level, and includes shift registers 1211 to 1216, NAND circuits 1217 to 1227, and NOR circuits 1228 to 1232 .
- the counter circuit 121 becomes the signal START power 3 ⁇ 4iigh, and the writing is started. Every time the write pulse signal PULSE is applied, the counter is incremented to generate the signal COUNT (5: 0). Trust The signal COUNT (5: 0) is input to the gate of the selection transistor that selects the capacitor of the voltage control circuit described later. As a result, the boosted voltage VPP applied to the gate of the memory cell transistor can be stepped up.
- Signal PULSE has the same timing as signal PGMTIM E. In the PGM4TH state, when the signal MAXVPP input to the control logic 125 becomes high, the counter circuit 121 holds the set signal COUNT (5: 0).
- the timer circuit 124 includes shift registers 1241 to 1244, and generates a signal CLK :, a signal CLK B, a signal PGM, a signal RESET, and a signal RESETB force signal TIME (3: 0).
- the timer circuit 124 is reset every time a pulse is applied, and starts counting again. For example, the timer circuit 124 increases the signal TIME (3: 0) with a period of 50 ns every time a pulse is applied.
- the circuit 126 is a circuit that detects that the write voltage has reached the maximum voltage (predetermined voltage), and includes NAND circuits 1261 and 1262, a NOR circuit 1263, and an inverter 1264, and the signal MAXVPP from the signal COUNT (5: 0) And generate the signal MAXVPPB.
- the circuit 127 includes inverters 1271 to 1278.
- the signal RESET, signal CLK :, signal S TART, signal PULSE, signal TIME (3: 0) to signal RESETB, signal CLKB, signal S TARTB, signal PULSEB, signal TIME (3: 0) B is generated.
- the circuit 128 is a circuit that generates a signal that defines the pulse width of the write voltage for each level by any combination of the signals TIM E (3: 0).
- the signal PGMTIM E is a signal that determines the time for applying the write pulse. In the PGM4TH state where the pulse is set in each state, the pulse is set so that it takes longer than usual when the signal MAXVPP power is high.
- the circuit 128 detects that the write voltage has reached the maximum voltage and then uses it at another level. Since a signal specifying a write voltage having a pulse width longer than the write voltage is generated, the write time can be shortened at the last level.
- FIG. 14 is a timing diagram of the logic 1290.
- the signal VPPOK is a signal that goes High when the boost voltage VPP reaches a specified value.
- the signal PGMTIME rises when the signal VPPOK becomes High, and falls when the output PGMTIMEEND of the NAND circuit 1289 becomes High.
- the pulse width of the write voltage can be adjusted for each level using signal VPPOK and signal PGMTIMEEND.
- FIG. 15 is a diagram showing the generation circuit 130.
- the generation circuit 130 is provided in the control circuit 102.
- the generation circuit 130 includes circuits 140 and 150 and control logic 160.
- the circuit 140 includes inverters 141 to 145 and a NAND circuit 146, generates a signal ONESHOT from the signal START, and supplies the signal ONESHOT to the latch circuit 150.
- the latch circuit 150 is a circuit that latches the write voltage when the verification when the first level of the plurality of levels is a write target is passed (predetermined timing).
- the PMOS transistor 151 and the NMOS transistor 152 In the respective write states, the boosted voltage VPP when the verification is passed is set to the inverters 153 and 154 latches.
- Latch circuits are provided for the signal COUNT. This latching operation is performed by generating a pulse of several nanometers when the next state is disclosed.
- the control logic 160 reflects the contents of this latch in the initial voltage of the next write state.
- the control logic 160 receives the signal COUNT—LATCH (5: 0), the signal PGM2ND, the signal PGM3RD, the signal PGM4TH, and the signal MAXVPP to determine the initial write voltage corresponding to the write voltage latched in the latch circuit 150. Issue INPUT (5: 0).
- the control logic 160 controls the signal INPUT (5: 0) by combining the signals ⁇ 11 ⁇ ⁇ _ ⁇ ⁇ ⁇ 11 (5: 0), PGM2ND, PGM3RD, and PGM4TH. For example, when PGM2ND is completed at 5.0v, the control logic 160 sets the initial voltage of PGM3RD to 7.0v, and when it is 6.0v, sets it to 8.Ov. Set. Circuit 1 21 receives the signal INPUT (5: 0) from control logic 160 and writes to the next level. Generate a signal COUNT (5: 0) that specifies the step width of the applied voltage.
- the generation circuit 130 includes the latch circuit 150 that latches the write voltage when the verification when the first level of the plurality of levels is a write target is passed, and the latch circuit 150.
- Control logic 160 that generates a signal that defines a second level write voltage next to the first level based on an initial write voltage corresponding to the latched write voltage, so that the previous level write voltage By generating a signal that defines the next level write voltage in consideration of the above, it is possible to realize a write operation according to the characteristics of the device and shorten the write time.
- FIG. 16 is a diagram showing a WL high voltage generation circuit 2 that generates a gate voltage.
- the WL high voltage generation circuit 2 includes an internal boost circuit 201, a high voltage conversion circuit 202, and a voltage control circuit 203.
- the voltage control circuit 203 includes a PMOS transistor 204, NMOS transistors 205 to 209, a comparison circuit 210, selection transistors 211 to 216, capacitors CA2 and CB2, and capacitors CC to CC32.
- the selection transistors 211 to 216 are composed of NMOS transistors.
- the gates of the selection transistors 211 to 216 are controlled by a signal COUNT (5: 0) output from the counter circuit 121 of FIG.
- the capacitors CC to CC32 are connected to the node N2 via selection transistors 211 to 216.
- the divided voltage VPPDIV is generated by capacitively dividing the boost voltage VPP.
- the signal COUNT (5: 0) is incremented, the capacitors CC to CC32 connected to the node N2 are selected, and the value of the divided potential VPPDIV changes. This divided voltage VPPDIV becomes the input of the comparison circuit 210.
- the comparison circuit 210 compares the reference voltage VREF and the divided voltage VPPDIV and outputs a signal Vout.
- the signal Vout becomes, for example, Low, and the internal booster circuit 201 raises the boosted potential VPP.
- the control circuit 102 controls each state. The initial voltage of the boost voltage VPP and the step voltage when ramping are optimized.
- FIG. 17 is a diagram showing a BL high voltage generation circuit 3 that generates a drain voltage.
- the BL high voltage generation circuit 3 includes an internal booster circuit 301, high voltage conversion circuits 302 and 33, and a voltage control circuit 304.
- the voltage control circuit 304 includes PMOS transistors 305 and 306, NMOS transistors 307 to 311,]; Includes Sitter CA3 and CB3.
- the divided voltage VDDDIV is generated by capacitively dividing the boost voltage VDD. This divided voltage VDDDIV is input to the comparison circuit 312.
- the comparison circuit 312 compares the reference voltage VREF and the divided voltage VDDDIV and outputs a signal Vout.
- the high voltage conversion circuit 303 is controlled by the signal PGMTIME generated by the circuit 128 in FIG.
- the boost voltage VDD is controlled. After boosting and controlling the boosted voltage VDD to the set voltage, the write drain pulse VDD is applied to the drain of the memory cell transistor via the terminal 313 only when the signal PGMTIME is high.
- FIG. 18 is a diagram showing the internal booster circuit 201 used in the second embodiment.
- the internal booster circuit 201 includes NMOS transistors 220 to 232 and capacitors 233 to 240.
- the signal PHI1 is a clock signal
- the signal PHI2 is a complementary signal of the signal PHI1 and is generated inside the semiconductor device 100.
- Signal PHI1 and signal PHI2 are input to one electrode of capacitors 233-240.
- the step-up operation is repeated from the basic pump cell at the first stage to the basic pump cell at the final stage, and the high voltage high_voltage is output from the output through the transistor 232 for preventing the backflow of current. Since the internal booster circuit 301 has the same configuration, the description thereof is omitted here.
- FIG. 19 is a diagram showing the high-voltage conversion circuit 202 used in FIG. Shown in Figure 19
- the high voltage conversion circuit 202 includes PMOS transistors 250 and 251, NMOS transistors 252 and 253, and inverters 254 and 255.
- the gates of the NMOS transistors 252 and 253 are controlled by the power supply voltage VCC.
- the PMOS transistor 251 When the input INPUT is High, the PMOS transistor 251 is turned on and the output OUTPUT power 3 ⁇ 4iigh.
- PMOS transistor 251 is off, PMOS transistor 250 is on, and output OUTPUT is low. Since the high voltage conversion circuits 302 and 303 have the same configuration, description thereof is omitted here.
- FIG. 20 shows the shift register used in FIG.
- the shift register 1211 includes NMOS transistors 401 to 403, a PMOS transistor 404, and inductors 405 to 408.
- the signal DATA is input when the signal CLK is high
- the latch composed of the inverters 405 and 406 is set.
- the latch force S consisting of inverters 407 and 408 is set.
- FIG. 21 is a timing diagram of PGM2ND in the ramp gate program.
- PGM2 ND a program verify operation and a write operation are performed a predetermined number of times.
- the counter circuit 121 takes in the signal INPUT (5: 0) from the control logic 125 and sets the initial voltage of each PGM stage.
- the step-up voltage VPP applied to the lead wire increases stepwise from the set initial voltage.
- the signal VPPOK is a signal that becomes High when the boosted voltage VPP reaches a predetermined value.
- signal VPPOK goes high, signal PG MTIME goes high until signal PGMTIMEEND goes high.
- the boosted voltage VDD is applied to the bit line while the signal PGMTIME is high.
- the timer circuit 124 in FIG. 13 counts for a predetermined clock, it detects the NOR circuit 1281 to 1284 force S in the circuit 128 in FIG. 13 and outputs a high signal.
- NAND circuit 1285 receiving PGM2ND outputs Low for the first time.
- the output PGMTIMEEND of the NAND circuit 1289 in the final stage becomes High for the first time, the signal PGMTIME becomes Low, and the drain pulse application ends.
- FIG. 22 is a timing diagram of PGM4TH in the ramp gate program. Perform the program verify operation once. When the MATCH judgment in the first verification fails, the ramp gate program flow starts and the boost voltage VPP is boosted slightly.
- the counter circuit 121 takes in the signal I NPUT (5: 0) from the control logic 125 when the signal START is Low, and sets the initial voltage of each PGM stage. The boosted voltage VPP applied to the word line increases in steps from the set initial voltage.
- the boosted voltage VDD is applied to the bit line while the signal PGMTIME is High.
- the timer circuit 124 in FIG. 13 counts for a predetermined clock
- the NOR circuit 1281 to 1284 force S in the circuit 128 in FIG. 13 is detected, and when a high signal is output, the signals PGM4 TH and MAXVPPB are received NAND circuit 1287 outputs Low.
- the output PGMTIMEEND of the NAND circuit 1289 in the final stage becomes High, the signal PGMTIME becomes Low, and the drain pulse application ends.
- the write operation is executed by applying a pulse much longer than usual while maintaining the boost voltage VPP at the maximum voltage.
- the boost voltage VDD is applied to the bit line.
- the timer circuit 124 in FIG. 13 detects the count of a predetermined number of clocks and detects the NOR circuit 1281 to 1284 of the circuit 128 in FIG. 13 and outputs a high signal, it receives the signal PGM4TH and the signal MAXVPP.
- NAND circuit 1288 outputs Low.
- the output PGMTIMEEND of the NAND circuit 1289 at the final stage becomes High, the signal PGMTIME becomes Low, and the drain pulse application ends. If the second verifi flow passes, all write operations are terminated.
Abstract
Description
Claims
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KR1020077005056A KR100928738B1 (ko) | 2004-08-30 | 2004-08-30 | 반도체 장치, 반도체 장치의 테스트 방법 및 데이터 기록방법 |
EP04772431A EP1785998A1 (en) | 2004-08-30 | 2004-08-30 | Semiconductor device, semiconductor device testing method, and data writing method |
JP2006531191A JPWO2006025083A1 (ja) | 2004-08-30 | 2004-08-30 | 半導体装置、半導体装置の試験方法およびデータ書き込み方法 |
PCT/JP2004/012475 WO2006025083A1 (ja) | 2004-08-30 | 2004-08-30 | 半導体装置、半導体装置の試験方法およびデータ書き込み方法 |
US11/215,253 US7184338B2 (en) | 2004-08-30 | 2005-08-30 | Semiconductor device, semiconductor device testing method, and programming method |
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US11/215,253 Continuation US7184338B2 (en) | 2004-08-30 | 2005-08-30 | Semiconductor device, semiconductor device testing method, and programming method |
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Also Published As
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US7184338B2 (en) | 2007-02-27 |
JPWO2006025083A1 (ja) | 2008-07-31 |
KR100928738B1 (ko) | 2009-11-27 |
US20060077736A1 (en) | 2006-04-13 |
EP1785998A1 (en) | 2007-05-16 |
KR20070042569A (ko) | 2007-04-23 |
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