WO2010089815A1 - 不揮発性半導体メモリ - Google Patents
不揮発性半導体メモリ Download PDFInfo
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- WO2010089815A1 WO2010089815A1 PCT/JP2009/004737 JP2009004737W WO2010089815A1 WO 2010089815 A1 WO2010089815 A1 WO 2010089815A1 JP 2009004737 W JP2009004737 W JP 2009004737W WO 2010089815 A1 WO2010089815 A1 WO 2010089815A1
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- semiconductor memory
- drain voltage
- switch control
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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
- G11C16/10—Programming or data input circuits
-
- 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
- G11C11/56—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using storage elements with more than two stable states represented by steps, e.g. of voltage, current, phase, frequency
- G11C11/5621—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using storage elements with more than two stable states represented by steps, e.g. of voltage, current, phase, frequency using charge storage in a floating gate
- G11C11/5628—Programming or writing circuits; 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
- G11C16/34—Determination of programming status, e.g. threshold voltage, overprogramming or underprogramming, retention
- G11C16/3436—Arrangements for verifying correct programming or erasure
- G11C16/3454—Arrangements for verifying correct programming or for detecting overprogrammed cells
Definitions
- the present invention relates to a nonvolatile semiconductor memory, and more particularly to a technique for suppressing variation in writing speed when simultaneously writing a plurality of nonvolatile memory cells at the same threshold level.
- a nonvolatile semiconductor memory such as a flash memory is a memory composed of a gate electrode connected to a word line, a drain connected to a bit line, a source connected to the source line, and a floating gate or a charge trap layer.
- a memory cell array having a plurality of memory cells arranged in a matrix;
- a discrete trap layer SiN film or SiN film / top SiO 2 film
- SiO 2 insulating film
- 600 is a semiconductor substrate made of P-type silicon
- 601 is a P-type channel region provided on the semiconductor substrate 600
- 602 is an N-type semiconductor provided on the semiconductor substrate 600 on one side of the channel region 601.
- 603 is a second impurity region (for example, a source) made of an N-type semiconductor provided on the semiconductor substrate 600 on the other side of the channel region 601
- 604 is a semiconductor substrate.
- 600 is a bottom insulating film made of a silicon oxide film provided on 600
- 605 is a trap layer made of a silicon oxynitride film provided on the bottom insulating film 604
- 606 is an oxide of silicon provided on the trap layer 605.
- a top insulating film 607 is a gate electrode made of N-type polysilicon provided on the top insulating film 606. .
- the gate electrode 607 At the time of writing, about 9 V is applied to the gate electrode 607, about 5 V is applied to the first impurity region (drain) 602, 0 V is applied to the second impurity region (source) 603, and 0 V is applied to the semiconductor substrate 600. Accordingly, a part of the electrons traveling from the second impurity region 603 toward the first impurity region 602 becomes hot due to a high electric field in the vicinity of the first impurity region 602, and the trap layer 605 in the vicinity of the first impurity region 602 is obtained. The threshold level of the memory cell becomes high.
- a plurality of memory cells such as byte units or word units are used as one unit, and the write voltage is simultaneously applied to these memory cells for writing, thereby shortening the write time. It is common to plan.
- a nonvolatile semiconductor memory having a trap layer voltages applied to the first impurity region 602 and the second impurity region 603 of the memory cell are switched so that 0 V is applied to the first impurity region 602 and the second impurity region By applying approximately 5 V to the region 603 and locally injecting electrons into the trap layer 605 in the vicinity of the second impurity region 603, two bits of data can be stored in one memory cell. Is possible.
- the area of the memory cell array has increased with the increase in capacity of the nonvolatile semiconductor memory, and the length of the bit lines provided in the memory cell array has also increased accordingly. Therefore, at the time of writing, there is a problem in that the drain voltage varies depending on the position of the memory cell in the memory cell array due to the voltage drop due to the resistance of the bit line, and the writing speed varies.
- the storage state of the first bit affects the writing speed of the second bit. Is known, and causes a variation in writing speed.
- the bit lines of the plurality of nonvolatile memory cells are connected to M data lines (M is an integer of 2 or more) by a column address signal.
- M is an integer of 2 or more
- N switches N is an integer of 1 or more
- a switch control circuit for controlling the N switches are provided for each data line
- M ⁇ N switches are provided by the M switch control circuits.
- the voltage level of the drain voltage applied to the bit lines of the plurality of memory cells or the application period of the drain voltage is changed for each memory cell.
- the reliability of the memory cell is reduced by suppressing the variation in the writing speed between the memory cells when simultaneously writing a plurality of nonvolatile memory cells and reducing the variation in the threshold level after the writing. And an increase in writing time due to variations in writing speed can be suppressed.
- FIG. 1 is a block diagram showing a first configuration example of a nonvolatile semiconductor memory according to the present invention.
- FIG. It is a figure which shows the 1st structural example of the switch circuit and switch control circuit which concern on this invention. It is a figure explaining the switch control method in the 1st structural example of the switch circuit and switch control circuit which concern on this invention. It is a figure which shows the 2nd structural example of the switch circuit and switch control circuit which concern on this invention. It is a figure explaining the switch control method in the 2nd structural example of the switch circuit which concerns on this invention, and a switch control circuit. It is a figure which shows the 3rd structural example of the switch circuit and switch control circuit which concern on this invention.
- FIG. 1 shows a configuration example of a nonvolatile semiconductor memory according to the present invention.
- 100 is a memory cell array composed of a plurality of memory cells
- 101 is a column decoder for connecting a plurality of bit lines and M data lines DIO1 to DIOm, which are smaller than the number of bit lines, by a column address signal
- 102 is a bit A drain voltage generation circuit for supplying a drain voltage to a line.
- a first terminal of each of the N switches SW1 to SWn is connected in common to each data line, and a drain voltage generation circuit 102 is connected to a second terminal of each of the N switches SW1 to SWn. Are connected in common to drain voltage supply lines VD.
- a switch control circuit 103 that controls N switches SW1 to SWn is provided for each data line.
- the M switch control circuits 103 control M ⁇ N switches to change the drain voltage level supplied to the M data lines DIO1 to DIOm or the supply period of the supplied drain voltage for each data line. .
- the write speed of the memory cells connected to the M data lines DIO1 to DIOm can be changed for each memory cell, and variations in the write speed when simultaneously writing a plurality of memory cells can be suppressed.
- FIG. 2 shows a first configuration example of a switch circuit and a switch control circuit that change the voltage level of the drain voltage supplied to the data line.
- the first terminals of the two P-type transistors P1 and P2 are commonly connected to the data line DIO, and the second terminals of the P-type transistors P1 and P2 are connected to the drain voltage supply line. Commonly connected to VD.
- the switch control circuit 201 receives a data input signal DIN, switch control input signals SWIN1 and SWIN2, and outputs switch control output signals SWOUT1 and SWOUT2.
- the switch control output signals SWOUT1 and SWOUT2 are connected to the gate terminals of the P-type transistors P1 and P2 of the switch circuit 200, respectively.
- FIG. 3 shows a relationship among the data input signal DIN, the switch control input signals SWIN1, SWIN2, and the switch control output signals SWOUT1, SWOUT2 in the switch control circuit 201.
- “L” represents 0 V
- “H” represents the same level as the drain voltage supply line VD.
- SWOUT1 is “L”
- the P-type transistor P1 of the switch circuit 200 is turned on
- SWOUT2 is “L”
- the P-type transistor P2 of the switch circuit 200 is turned on.
- the transistor resistance between the data line DIO and the drain voltage supply line VD can be changed by changing the combination of the P-type transistors P1 and P2 of the switch circuit 200, and the voltage drop due to the transistor resistance can be changed.
- the voltage level supplied to the data line DIO can be changed by the combination of turning on the P-type transistors P1 and P2 of the switch circuit 200.
- FIG. 4 shows a second configuration example of the switch circuit and the switch control circuit for changing the voltage level of the drain voltage supplied to the data line.
- the first terminals of the P-type transistor P1 and the N-type transistor N1 are commonly connected to the data line DIO, and the second terminals of the P-type transistor P1 and the N-type transistor N1 are drains. Commonly connected to the voltage supply line VD.
- the switch control circuit 301 receives a data input signal DIN and a switch control input signal SWIN, and outputs switch control output signals SWOUT1 and SWOUT2.
- the switch control output signals SWOUT1 and SWOUT2 are connected to the gate terminals of the P-type transistor P1 and the N-type transistor N1 of the switch circuit 300, respectively.
- FIG. 5 shows the relationship among the data input signal DIN, the switch control input signal SWIN, and the switch control output signals SWOUT1, SWOUT2 in the switch control circuit 301.
- “L” represents 0 V
- “H” represents the same level as the drain voltage supply line VD.
- SWOUT1 is “L”
- the P-type transistor P1 is turned on
- SWOUT2 is “H”
- the N-type transistor N1 is turned on.
- the P-type transistor P1 is turned on, the level of the drain voltage supply line VD is supplied as it is to the data line DIO.
- the gate voltage here, the drain voltage supply line VD level
- VD level the gate voltage supply line VD level
- FIG. 6 shows a configuration example of a switch circuit and a switch control circuit that change the supply period of the drain voltage supplied to the data line.
- the first terminal of the P-type transistor P1 is connected to the data line DIO, and the second terminal of the P-type transistor P1 is connected to the drain voltage supply line VD.
- the switch control circuit 401 receives a data input signal DIN and a switch control input signal SWIN, and outputs a switch control output signal SWOUT.
- the switch control output signal SWOUT is connected to the gate terminal of the P-type transistor P1 of the switch circuit 400.
- the switch control circuit 401 includes a delay circuit 402 including a resistance element R and a capacitance element C with the ground potential as GND, and the “L” period of the switch control output signal SWOUT can be switched by the switch control input signal SWIN. .
- FIG. 7 shows a relationship among the data input signal DIN, the switch control input signal SWIN, and the switch control output signal SWOUT in the switch control circuit 401.
- “L” represents 0 V
- “H” represents the same level as the drain voltage supply line VD.
- the P-type transistor P1 is turned on while the switch control output signal SWOUT is “L”, and supplies the drain voltage to the data line DIO.
- the supply period of the voltage supplied to the data line DIO can be changed by the switch control input signal SWIN.
- FIG. 8 shows another configuration example of the nonvolatile semiconductor memory according to the present invention.
- 500 is a memory cell array composed of a plurality of memory cells
- 501 is a column decoder for connecting a plurality of bit lines and M data lines DIO1 to DIOm smaller than the number of the bit lines by a column address signal
- 505 is a memory.
- This is a readout circuit for reading out data from the cell array 500, and has M data lines DIO1 to DIOm as inputs, and is composed of a sense amplifier (not shown).
- a drain voltage generation circuit 502 supplies a drain voltage to the bit line.
- the memory cell array 500 includes memory cells having a trap layer shown in FIG. 9, and 2 bits of data can be stored in one memory cell.
- a first terminal of each of the N switches SW1 to SWn is connected in common to each data line, and a drain voltage generation circuit 502 is connected to a second terminal of each of the N switches SW1 to SWn. Are connected in common to drain voltage supply lines VD.
- a switch control circuit 503 for controlling the N switches SW1 to SWn is provided for each data line.
- a state storage circuit 504 that stores the storage state (“0” or “1”) of the memory cell read by the read circuit 505 is provided.
- the state storage circuit 504 outputs state output signals CB1 to CBm according to the storage state of the stored memory cells, and the state output signals CB1 to CBm are connected to the M switch control circuits 503.
- the storage state of the second bit of the memory cell is read in advance by the read circuit 505 and the read result is stored in the state.
- the state storage circuit 504 When writing the first bit of the memory cell, the state storage circuit 504 outputs the state output signals CB1 to CBm according to the stored storage state, and M data according to the state output signals CB1 to CBm.
- the voltage level supplied to the lines DIO1 to DIOm or the supply period of the supplied voltage is changed for each data line.
- the write speed of the first bit of the memory cell connected to the M data lines DIO1 to DIOm can be changed for each memory cell according to the storage state of the second bit of the memory cell. Thus, variation in writing speed when simultaneously writing a plurality of memory cells can be suppressed.
- the threshold level state of the memory cell to be written is read in advance by the read circuit 505.
- the read result is stored in the state storage circuit 504.
- the state storage circuit 504 outputs state output signals CB1 to CBm according to the stored threshold level state, and M data lines DIO1 to DIOm according to the state output signals CB1 to CBm.
- the supply voltage level or the supply period of the supplied voltage is changed for each data line.
- the writing speed of the memory cells connected to the M data lines DIO1 to DIOm can be changed for each memory cell in accordance with the threshold level state of the memory cell to which writing is performed. Variations in writing speed when writing cells simultaneously can be suppressed.
- the embodiment has been described in which the number of switches connected to one data line is two or one. However, in the present invention, it is possible to provide three or more switches.
- the number of storage bits of one memory cell has been described as 2 bits. However, the voltage relationship between the first impurity region and the second impurity region of the memory cell is switched and written. In the case of a memory cell capable of performing the above, the present invention can be applied even with 3 bits or more.
- the nonvolatile semiconductor memory according to the present invention can improve the memory cell reliability by suppressing the variation in the writing speed for each memory cell, and also suppress the increase in the writing time due to the variation in the writing speed. it can.
- it is useful as a nonvolatile semiconductor memory having a trap layer and capable of storing a plurality of bits in one memory cell.
- Switch control circuit 100 500 Memory cell array 101, 501 Column decoder 102, 502 Drain voltage generation circuit 103, 503 Switch control circuit 200, 300, 400 Switch circuit 201, 301, 401 Switch control circuit 402 Delay circuit 504 State storage circuit 505 Read circuit 600 Semiconductor Substrate 601 Channel region 602 First impurity region (drain) 603 Second impurity region (source) 604 Bottom insulating film 605 Trapping layer 606 Top insulating film 607 Gate electrode C Capacitance elements CB1 to CBm State output signal DIN Data input signals DIO, DIO1 to DIOm Data line GND Ground potential N1 N-type transistor P1, P2 P-type transistor R Resistance element SW1 to SWn Switch SWIN, SWIN1, SWIN2 Switch control input signal SWOUT, SWOUT1, SWOUT2 Switch control output signal VD Drain voltage supply line
Abstract
Description
101,501 コラムデコーダ
102,502 ドレイン電圧生成回路
103,503 スイッチ制御回路
200,300,400 スイッチ回路
201,301,401 スイッチ制御回路
402 遅延回路
504 状態格納回路
505 読み出し回路
600 半導体基板
601 チャネル領域
602 第1の不純物領域(ドレイン)
603 第2の不純物領域(ソース)
604 ボトム絶縁膜
605 トラップ層
606 トップ絶縁膜
607 ゲート電極
C 容量素子
CB1~CBm 状態出力信号
DIN データ入力信号
DIO,DIO1~DIOm データ線
GND 接地電位
N1 N型トランジスタ
P1,P2 P型トランジスタ
R 抵抗素子
SW1~SWn スイッチ
SWIN,SWIN1,SWIN2 スイッチ制御入力信号
SWOUT,SWOUT1,SWOUT2 スイッチ制御出力信号
VD ドレイン電圧供給線
Claims (8)
- 複数本のビット線を通して複数個の不揮発性メモリセルを同時に書き込むことが可能な不揮発性半導体メモリであって、
コラムアドレス信号に応じて前記複数本のビット線に接続される、前記ビット線の本数より少ないM本(Mは2以上の整数)のデータ線と、
前記複数個の不揮発性メモリセルの各々のドレイン電圧の源となる電圧を生成するドレイン電圧生成回路と、
前記ドレイン電圧生成回路の出力が接続されたドレイン電圧供給線と、
前記M本のデータ線と前記ドレイン電圧供給線との間に介在したM個のスイッチ回路及びM個のスイッチ制御回路とを備え、
前記M個のスイッチ回路の各々は、N個(Nは1以上の整数)のスイッチを有し、
前記M×N個のスイッチの各々は、前記M本のデータ線のうちの対応する1本のデータ線に共通に接続された第1の端子と、前記ドレイン電圧供給線に共通に接続された第2の端子とを有し、
前記M本のデータ線に対して前記M×N個のスイッチを介して前記ドレイン電圧供給線が接続され、前記M個のスイッチ制御回路で前記M×N個のスイッチを制御することを特徴とする不揮発性半導体メモリ。 - 請求項1記載の不揮発性半導体メモリにおいて、
前記M個のスイッチ回路のいずれかを構成するN個のスイッチは、互いに並列接続された1導電型のトランジスタでそれぞれ構成され、
前記M本のデータ線のうち対応する1本のデータ線にドレイン電圧を供給すべき場合には、前記N個のトランジスタのうち少なくとも1個のトランジスタが、対応するスイッチ制御回路の制御によりオンすることを特徴とする不揮発性半導体メモリ。 - 請求項1記載の不揮発性半導体メモリにおいて、
前記M個のスイッチ回路のいずれかを構成するN個のスイッチは、互いに並列接続されたP型及びN型トランジスタで構成され、
前記M本のデータ線のうち対応する1本のデータ線にドレイン電圧を供給すべき場合には、前記P型又はN型トランジスタのいずれか一方が、対応するスイッチ制御回路の制御によりオンすることを特徴とする不揮発性半導体メモリ。 - 請求項1記載の不揮発性半導体メモリにおいて、
前記M個のスイッチ制御回路は、前記M本のデータ線のうち対応する1本のデータ線に接続された前記N個のスイッチがオンする組み合わせを、前記M本のデータ線の1本ごとに制御することが可能であることを特徴とする不揮発性半導体メモリ。 - 請求項1記載の不揮発性半導体メモリにおいて、
前記M個のスイッチ制御回路は、前記M本のデータ線のうち対応する1本のデータ線に接続された前記N個のスイッチがオンする期間を、前記M本のデータ線の1本ごとに制御することが可能であることを特徴とする不揮発性半導体メモリ。 - 請求項1記載の不揮発性半導体メモリにおいて、
前記M本のデータ線を入力とする読み出し回路と、
前記読み出し回路より出力されたM本の読み出し信号が入力される状態格納回路とを更に備え、
前記状態格納回路より出力されたM本の状態出力信号に応じて、前記M個のスイッチ回路が制御されることを特徴とする不揮発性半導体メモリ。 - 請求項6記載の不揮発性半導体メモリにおいて、
前記複数個の不揮発性メモリセルの各々は、ソース・ドレイン電圧関係を反転させることで書き込み可能な複数ビットのデータを記憶可能であり、
一方向のソース・ドレイン電圧印加による第1のビットの書き込み時において、逆方向のソース・ドレイン電圧印加によって書き込みを行う第2のビットの記憶状態の読み出しを行い、読み出した記憶状態を前記状態格納回路に蓄え、
前記状態格納回路に蓄えられた記憶状態に応じて前記M個のスイッチ制御回路の制御方法が変更されることを特徴とする不揮発性半導体メモリ。 - 請求項6記載の不揮発性半導体メモリにおいて、
前記複数個の不揮発性メモリセルの書き込み時に、書き込みを行うメモリセルの閾値レベル状態の読み出しを行い、読み出した閾値レベル状態を前記状態格納回路に蓄え、
前記状態格納回路に蓄えられた閾値レベル状態に応じて前記M個のスイッチ制御回路の制御方法が変更されることを特徴とする不揮発性半導体メモリ。
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CN2009801558722A CN102301426A (zh) | 2009-02-06 | 2009-09-18 | 非易失性半导体存储器 |
JP2010549275A JP5468023B2 (ja) | 2009-02-06 | 2009-09-18 | 不揮発性半導体メモリ |
US13/190,130 US8400835B2 (en) | 2009-02-06 | 2011-07-25 | Non-volatile semiconductor memory |
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JPH0562484A (ja) * | 1991-09-06 | 1993-03-12 | Mitsubishi Electric Corp | 不揮発性半導体記憶装置 |
JPH06150670A (ja) * | 1992-02-06 | 1994-05-31 | Hitachi Ltd | 半導体記憶装置 |
WO2002097821A1 (fr) * | 2001-05-25 | 2002-12-05 | Fujitsu Limited | Dispositif de stockage non volatile a semi-conducteur |
JP2003346484A (ja) * | 2002-05-23 | 2003-12-05 | Mitsubishi Electric Corp | 不揮発性半導体記憶装置 |
JP2004273096A (ja) * | 2003-03-07 | 2004-09-30 | Hynix Semiconductor Inc | フラッシュメモリ用ドレインポンプ |
Also Published As
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JPWO2010089815A1 (ja) | 2012-08-09 |
US8400835B2 (en) | 2013-03-19 |
US20110280081A1 (en) | 2011-11-17 |
JP5468023B2 (ja) | 2014-04-09 |
CN102301426A (zh) | 2011-12-28 |
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