WO2004077449A1 - 半導体記憶装置 - Google Patents
半導体記憶装置 Download PDFInfo
- Publication number
- WO2004077449A1 WO2004077449A1 PCT/JP2004/002089 JP2004002089W WO2004077449A1 WO 2004077449 A1 WO2004077449 A1 WO 2004077449A1 JP 2004002089 W JP2004002089 W JP 2004002089W WO 2004077449 A1 WO2004077449 A1 WO 2004077449A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- memory
- array
- cell
- cells
- bit line
- Prior art date
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Classifications
-
- 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
- G11C16/26—Sensing or reading circuits; Data output circuits
- G11C16/28—Sensing or reading circuits; Data output circuits using differential sensing or reference cells, e.g. dummy cells
Definitions
- the present invention relates to a semiconductor memory device.
- the present invention relates to reading from a nonvolatile semiconductor memory device such as a flash or an EEPROM.
- FIG. 5 shows a schematic configuration example of a conventional general flash memory.
- the memory 'array cell 51 composed of a large number of flash memories sends the outputs of 104 bit lines to the multiplexer 5.2.
- the sense amplifier 53 connected to the output side of the multiplexer 52 is provided at a ratio of one to 128 bit lines. Therefore, eight sense amplifiers 53 are connected to the output side of the multiplexer 52.
- a reference cell 54 that outputs a reference current is connected to the inverting input terminal of each sense amplifier 53. Note that the sense amplifier 53 is a current-voltage conversion amplifier.
- a conventional flash memory has a plurality of circuit blocks including a memory 'array' cell 51, a multiplexer 52, a sense amplifier 53, and a reference cell 54 having the above configuration (see FIG. 5). In the figure, only two circuit blocks are shown.)
- one memory array cell to be read from a plurality of memory array cells is selected, and the selected memory 'array' cell is 10. 2
- the data stored in the multiplexer is sent via the four bit lines.
- Multiplexer 52 sequentially outputs the data sent from the memory 'array' cells to each sense amplifier 53.
- each sense amplifier 53 compares the reference current output from the reference cell 54 with the current output from the multiplexer, and according to the compared difference. Output voltage.
- the flash memory shown in Fig. 5 has a configuration in which eight sense amplifiers are provided for one memory 'array' sensor, and in order to perform the above read operation, one read operation has eight pits. Only data could be read.
- the number of data bits that can be read in a single read operation increases by increasing the number of sense amplifiers provided for one memory cell.
- the circuit area of the current-voltage conversion type sense amplifier Is not preferable from the viewpoint of miniaturization. For this reason, the maximum number of sense amplifiers that can be provided for one memory 'array' cell is 16. Therefore, the conventional flash memory was limited to reading data of 8 to 16 bits in one read operation. That is, the reading speed of the conventional flash memory was slow
- the present invention has been made in view of the above problems, and has as its object to provide a semiconductor memory device with a high read speed.
- a plurality of memory cells and an array cell are provided for each of the memory cells, and each bit line of the memory cells is provided with a predetermined bit line.
- Precharge circuit that precharges to the voltage of the memory, and the memory selected for reading data
- a comparison circuit for comparing a voltage with a bit line for each bit line, and when reading the data, a voltage value for precharging a bit line of a memory array cell selected for reading the data.
- the voltage value for precharging the bit line of the memory array-cell selected for the reference is temporarily made different.
- the semiconductor memory device according to the present invention is a conventional semiconductor memory device that can only read from 8 bits to 16 bits in one read operation. As compared with, the reading speed can be dramatically increased.
- FIG. 1 is a diagram showing a schematic configuration example of a nonvolatile memory according to the present invention.
- FIG. 2 is a time chart showing signal waveforms of various parts of the nonvolatile memory of FIG. 1
- FIG. 3 is a diagram showing a configuration example of a sense amplifier included in the nonvolatile memory of FIG. 1
- FIG. 4 is a nonvolatile memory of FIG.
- FIG. 5 is a diagram showing another example of a configuration of a sense amplifier included in the conventional flash memory.
- FIG. 1 shows a schematic configuration example of a nonvolatile memory having the same memory size as a conventional flash memory according to the present invention.
- the memory 'array' cells that have data to be read out of the memory 'array cells' are hereafter referred to as the main 'array' cells.
- the main array cell 2 has 102 4 non-volatile memory cells 3.
- each bit line of the main array cell 2 is connected to each output terminal of the precharge circuit 1. That is, the precharge circuit 1 has 104 output terminals.
- Each bit line of the main array cell 2 is connected to a non-inverting input terminal of the sense amplifier 21 via a P-channel MOS-FET (Metal-Oxide-Semiconductor or Field-Effect Transistor) 4.
- MOS-FET Metal-Oxide-Semiconductor or Field-Effect Transistor
- the memory “array” cell 12 to be compared with the main “array” cell 2 has 102 4 nonvolatile memory cells 13. Then, each bit line of the memory array cell 12 is connected to each output terminal of the precharge circuit 11. That is, the precharge circuit 11 has 104 output terminals. Also, each bit line of the memory 'array' cell 12 is connected to the inverting input terminal of the sense amplifier 21 via the P-channel MOS FET 14. Then, precharge signals Purichiya temporary circuit 1 [Phi [rho and 1 V precharged signal PR s is inputted, a precharge signal [Phi [rho ⁇ Pi 1 V-flop Richiyaji signal PR D is input to the precharge circuit 1 1 .
- a selection signal SEL n (ti is an integer of 1 ⁇ ⁇ ⁇ 10 24) is input to the gates of the ⁇ -channel type MOS FETs 4 and 14 respectively.
- the main is Wadorain signal WL s to 'Control port Lumpur each Memorisenore third array cells within 2', gate one Sorted is commonly input, control of the memory cells 13 of the memory Arei cell 1 in 2- word line signal WL D is commonly input to the gate.
- an operation control signal SEN for switching the operation / non-operation of the sense amplifier 21 is input to each sense amplifier 21 in common.
- the sense amplifier 21 is a voltage amplifier that outputs a voltage signal obtained by amplifying a difference between two input voltages. Therefore, the circuit area of the sense amplifier 21 can be smaller than that of the current-voltage conversion amplifier used in the conventional flash memory. In FIG. 1, for simplicity of explanation, the precharge circuit having the above configuration is used.
- a basic circuit including a memory 'array' cell 12, a P-channel type MOS FET 14, and a sense amplifier 21 is shown.
- a plurality of the basic circuits are provided, and one basic circuit is selected from the plurality of basic circuits by the selection signal SELn.
- the sense amplifiers of a plurality of basic circuits may be shared, and the number of sense amplifiers of the entire nonvolatile memory may be n or m (m is a natural number of m ⁇ n).
- a plurality of P-channel MOSFETs are connected to the input terminals of each sense amplifier, and the plurality of P-channel MOSFETs function as a multiplexer.
- FIG. 1 The read operation of the nonvolatile memory will be described with reference to FIG. 1 and the time chart of FIG.
- the operation when reading the m-th (m is a natural number of m ⁇ 11) data of the memory 'array cell 2 and 12' will be described.
- the notation of m is omitted.
- the precharge signal [Phi [rho, 1 V precharge signal PR s, 1 V precharge signal PR D, the word line signal WL S, the word line signal WL D, The selection signal SEL, operation control signal SEN, and output signal OUT are at the Low level.
- Precharge signal [Phi [rho ⁇ Pi selection signal SEL is inverted from L ow level time point t 1 to H IgH level, hold the H IgH level until the time point t 8, the H IgH level t 8 when the L ow level Invert, and then maintain the Low level.
- the bit trine signal BL s and the voltage signal DIO s and the bit line signal BL D ⁇ Pi voltage signal DIO D becomes a signal of period t. 1 to t 8, other periods may become undefined I have.
- Precharge circuit 1 the precharge signal [Phi [rho is H IgH level and 1 V precharge signal PR s outputs where 0. 5 V of L ow level, the precharge signal [Phi [rho is H IgH level and 1 V pre charge signal PR s outputs an IV for H IgH level. Also, precharge circuits 1 1, precharge signal [Phi [rho is H IgH level and 1 V precharge signal PR D is Outputs the case 0, 5 V of L ow level, the precharge signal [Phi [rho is H IgH level and 1 V precharge signal PR D outputs a 1 V when the H IgH level.
- Word line signal WL S of the memory 'array' cell side for reading gradually increases from t 2 o'clock point, reaching H IgH level at t 3 time, the H IgH level maintained until t 6 time, t 6 It gradually decreases from the point in time, and reaches the Low level at time t7, and then maintains the Low level.
- the pit line signal BL s ⁇ Pi voltage signal DIO s is 1 to 1;. 3 Period 0.5 V is maintained, rises from 0.5 V to IV at 3 time points, 1 V is maintained until t 6 time, and gradually decreases from t 6 time When it reaches 0.5 V, it keeps 0.5 V until t8. On the other hand, since the ON memory cell if the memory cell 3 in the memory 'in array cell to be out reading not a write cell, the bit line signal BL s and the voltage signal DIO S for a period of t 1 ⁇ t 2 0.
- Maintain 5 V gradually decrease from time t2, reach 0 V at time t3, maintain 0 V until time t6, gradually increase from time t6, reach 0.5 V at time t7 Then, 0.5 V is maintained until t8 (see the dotted line in Fig. 2 for the period from t2 to t7).
- Word line signal WL D memory Arei cell side not read holds the L ow level. Therefore, the memory cell 1 3 regardless of the writing cells not Kanika, the bit line signal BL D ⁇ Pi voltage signal DIO d holds period 0. 5 V of tl ⁇ t 8.
- the operation control signal SEN becomes High level only during the period from t4 to t5. Therefore, when reading a memory cell that is a write cell in the array cell, the output signal OUT m (m is a natural number from 1 to 11) becomes High only during the period from 4 to t5. . On the other hand, if a memory cell that is not a write cell in a memory array cell to be read is read, the output signal OUT! (1 is a natural number of 1 or more and n or less) remains at the Low level during the period from t4 to t5 (for the period from t4 to t5, see the dotted line in FIG. 2).
- n-bit data can be read by one read operation.
- the output signal 0111 is inverted by the impeller to connect to the non-inverting input side of the sense amplifier.
- a signal similar to the output signal when reading data from the main array cell 2 is obtained.
- 12 becomes the main array cell. In the above description, only the case where the number of data is 10 24 has been described.
- non-volatile When the present invention is applied to a flash which is one of the memories, the area effect is particularly large. However, the present invention can be applied to a memory other than the nonvolatile memory, that is, a volatile memory.
- a volatile memory As an example of the configuration of the volatile memory according to the present invention, there is a configuration in which the memory cells 3 and 12 of the nonvolatile memory in FIG. 1 are replaced with volatile memory cells.
- FIG. 3 shows a configuration example of the sense amplifier 21.
- the source of the P-channel type MOS FET 31 and the source of the P-channel type MOS FET 32 are connected to the terminal to which the constant voltage Vcc is applied.
- the gate of the P-channel type MOSFET 31 and the gate of the P-channel type MOSFET 32 are commonly connected.
- the gate and drain of the P-channel MOSFET 31 are commonly connected.
- the drain of the P-channel type MOS transistor 31 is connected to the drain of the N-channel type MOS FET 33. Further, the drain of the P-channel type MOS FET 32 is connected to the terminal from which the output voltage OUT caulifloweris sent out and the drain of the N-channel type MOS FET 34.
- the terminal corresponding to the non-inverting input terminal (+) of the sense amplifier is connected to the gate of the N-channel MOS FET 33. Also, a terminal corresponding to the inverting input terminal (1) of the sense amplifier is connected to the gate of the N-channel type MOSFET 34.
- the source of the N-channel MOS FET 33 and the source of the N-channel MOS FET 34 are commonly connected, and are connected to the drain of the N-channel MOS FET 35.
- the gate of the N-channel type MOSFET 35 is connected to the terminal to which the operation control signal SEN is input.
- the source of the N-channel type MOSFET 35 is grounded.
- FIG. 4 Another example of the configuration of the sense amplifier 21 is shown in FIG. In FIG. 4, the same parts as those in FIG. 3 are denoted by the same reference numerals, and detailed description will be omitted. The difference between the sense amplifier in FIG. 4 and the sense amplifier in FIG.
- the nonvolatile semiconductor memory device of the present invention can be used for a computer or the like.
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- Read Only Memory (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/545,749 US7263012B2 (en) | 2003-02-25 | 2004-02-23 | Semiconductor storage device |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-46770 | 2003-02-25 | ||
JP2003046770 | 2003-02-25 | ||
JP2004-39596 | 2004-02-17 | ||
JP2004039596A JP2004281032A (ja) | 2003-02-25 | 2004-02-17 | 半導体記憶装置 |
Publications (1)
Publication Number | Publication Date |
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WO2004077449A1 true WO2004077449A1 (ja) | 2004-09-10 |
Family
ID=32929636
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2004/002089 WO2004077449A1 (ja) | 2003-02-25 | 2004-02-23 | 半導体記憶装置 |
Country Status (5)
Country | Link |
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US (1) | US7263012B2 (ja) |
JP (1) | JP2004281032A (ja) |
KR (1) | KR20050098937A (ja) |
TW (1) | TW200502976A (ja) |
WO (1) | WO2004077449A1 (ja) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
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TWI295805B (en) * | 2005-04-26 | 2008-04-11 | Via Tech Inc | Memory circuit and related method for integrating pre-decode and selective pre-charge |
KR100781984B1 (ko) * | 2006-11-03 | 2007-12-06 | 삼성전자주식회사 | 셀프 레퍼런스를 갖는 센스앰프 회로 및 그에 의한 센싱방법 |
US20140376316A1 (en) * | 2013-06-23 | 2014-12-25 | United Microelectronics Corporation | Programmable memory cell and data read method thereof |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0757482A (ja) * | 1993-08-10 | 1995-03-03 | Hitachi Ltd | 半導体不揮発性記憶装置 |
JPH07122080A (ja) * | 1993-08-31 | 1995-05-12 | Sony Corp | 半導体不揮発性記憶装置 |
JPH08221995A (ja) * | 1995-02-20 | 1996-08-30 | Sony Corp | データ読み出し回路 |
JPH11306782A (ja) * | 1998-04-24 | 1999-11-05 | Sharp Corp | 半導体記憶装置 |
JP2001167591A (ja) * | 1999-12-08 | 2001-06-22 | Matsushita Electric Ind Co Ltd | 半導体記憶装置 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3495337B2 (ja) | 1991-12-19 | 2004-02-09 | 株式会社東芝 | メモリベリファイ回路 |
US5297092A (en) * | 1992-06-03 | 1994-03-22 | Mips Computer Systems, Inc. | Sense amp for bit line sensing and data latching |
JPH065085A (ja) | 1992-06-17 | 1994-01-14 | Toshiba Corp | 不揮発性半導体記憶装置 |
US5440506A (en) * | 1992-08-14 | 1995-08-08 | Harris Corporation | Semiconductor ROM device and method |
KR0172403B1 (ko) | 1995-11-15 | 1999-03-30 | 김광호 | 불휘발성 반도체 메모리의 데이타 리드회로 |
JP3625240B2 (ja) | 1996-07-05 | 2005-03-02 | シャープ株式会社 | 半導体記憶装置 |
JP2001325794A (ja) | 2000-05-16 | 2001-11-22 | Mitsubishi Electric Corp | 半導体記憶装置 |
JP2002216483A (ja) | 2001-01-18 | 2002-08-02 | Toshiba Corp | 半導体記憶装置 |
-
2004
- 2004-02-17 JP JP2004039596A patent/JP2004281032A/ja active Pending
- 2004-02-23 US US10/545,749 patent/US7263012B2/en not_active Expired - Fee Related
- 2004-02-23 WO PCT/JP2004/002089 patent/WO2004077449A1/ja active Application Filing
- 2004-02-23 KR KR1020057015023A patent/KR20050098937A/ko not_active Application Discontinuation
- 2004-02-24 TW TW093104534A patent/TW200502976A/zh unknown
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0757482A (ja) * | 1993-08-10 | 1995-03-03 | Hitachi Ltd | 半導体不揮発性記憶装置 |
JPH07122080A (ja) * | 1993-08-31 | 1995-05-12 | Sony Corp | 半導体不揮発性記憶装置 |
JPH08221995A (ja) * | 1995-02-20 | 1996-08-30 | Sony Corp | データ読み出し回路 |
JPH11306782A (ja) * | 1998-04-24 | 1999-11-05 | Sharp Corp | 半導体記憶装置 |
JP2001167591A (ja) * | 1999-12-08 | 2001-06-22 | Matsushita Electric Ind Co Ltd | 半導体記憶装置 |
Also Published As
Publication number | Publication date |
---|---|
TW200502976A (en) | 2005-01-16 |
KR20050098937A (ko) | 2005-10-12 |
US7263012B2 (en) | 2007-08-28 |
US20060164895A1 (en) | 2006-07-27 |
JP2004281032A (ja) | 2004-10-07 |
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