WO2006018862A1 - 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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- WO2006018862A1 WO2006018862A1 PCT/JP2004/011751 JP2004011751W WO2006018862A1 WO 2006018862 A1 WO2006018862 A1 WO 2006018862A1 JP 2004011751 W JP2004011751 W JP 2004011751W WO 2006018862 A1 WO2006018862 A1 WO 2006018862A1
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- WIPO (PCT)
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- source
- memory cell
- semiconductor memory
- nonvolatile
- lines
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Classifications
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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
- G11C16/26—Sensing or reading circuits; Data output 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
- G11C16/04—Erasable programmable read-only memories electrically programmable using variable threshold transistors, e.g. FAMOS
- G11C16/0408—Erasable programmable read-only memories electrically programmable using variable threshold transistors, e.g. FAMOS comprising cells containing floating gate transistors
- G11C16/0416—Erasable programmable read-only memories electrically programmable using variable threshold transistors, e.g. FAMOS comprising cells containing floating gate transistors comprising cells containing a single floating gate transistor and no select transistor, e.g. UV EPROM
-
- 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
- G11C16/32—Timing circuits
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B69/00—Erasable-and-programmable ROM [EPROM] devices not provided for in groups H10B41/00 - H10B63/00, e.g. ultraviolet erasable-and-programmable ROM [UVEPROM] devices
Definitions
- the present invention relates to a nonvolatile semiconductor memory having nonvolatile memory cells.
- a nonvolatile semiconductor memory such as a flash memory stores data depending on whether or not it has the ability to hold electrons in a floating gate or a trap gate of a memory cell transistor (hereinafter also referred to as a memory cell).
- memory cells are formed at intersections between word lines and bit lines that are orthogonal to each other.
- the source line connected to the source of the memory cell is routed along the word line.
- the sources of memory cells arranged along a pair of word lines are connected to a common source line.
- the drains of the memory cells arranged along the bit line are connected to a common bit line.
- Japanese Patent Laid-Open No. 8-69696 discloses that by alternately accessing two memory cell arrays (subarrays), data can be read continuously even when the word line is switched. ing.
- Patent Document 1 Japanese Patent Laid-Open No. 7-114796
- Patent Document 2 JP-A-8-69696
- the present invention has been made to solve the following problems.
- nonvolatile semiconductor memory In the nonvolatile semiconductor memory disclosed in Japanese Patent Laid-Open No. 7-114796, memory cells connected to adjacent word lines and arranged along bit lines are connected to a common bit line and a common source line. When these memory cells are read sequentially, the selection periods of adjacent word lines cannot be overlapped. Therefore, when addresses are supplied randomly in a read operation (random access), data from memory cells cannot be output continuously.
- random access In Japanese Patent Application Laid-Open No. 8-69696, random access is a subarray. This is only possible when accessing In other words, when random access is performed with one subarray, data cannot be output continuously.
- random access cannot be executed in a nonvolatile semiconductor memory that performs parallel processing (pipeline processing) by overlapping a part of the active period of a word line.
- An object of the present invention is to perform random access in a nonvolatile semiconductor memory having a pipeline function for executing continuous read operations in parallel.
- it is to provide a non-volatile semiconductor memory that can be accessed randomly without increasing the chip size.
- a word line, a bit line, and a source line are connected to the gate, drain, and source of a plurality of nonvolatile memory cells arranged in a matrix.
- the word decoder activates the word line according to the address signal.
- the word decoder overlaps some of the active periods of the word lines to execute the access operation in parallel. That is, the non-volatile semiconductor memory can perform a knock line process in which access operations are executed in parallel.
- the combinations of bit lines and source lines connected to the drains and sources of the nonvolatile memory cells are all different.
- a memory cell current can be passed only between the drain and source of the target nonvolatile memory cell. . Therefore, in a nonvolatile semiconductor memory having a pipeline function for executing a plurality of read operations in parallel, random access for sequentially accessing arbitrary nonvolatile memory cells can be executed.
- the plurality of cell groups are arranged in the wiring direction of the word lines and configured by connecting nonvolatile memory cells in series.
- a pair of bit lines are wired in a zigzag pattern while crossing each other.
- each cell group the sources are connected to each other.
- the non-volatile memory cell pairs facing each other are connected to different source lines. Therefore, for every two non-volatile memory cell pairs facing each other (including four non-volatile memory cells), all combinations of bit lines and source lines connected to the drain and source of the non-volatile semiconductor memory are used. Can be different.
- a source region where a source is formed and a drain region where a drain is formed are alternately formed between word lines.
- a pair of source lines connected to the sources of the non-volatile memory cell pairs facing each other are wired on the source region and the drain region, respectively. For this reason, more source lines than before can be wired without increasing the size of the memory cell array. That is, it is possible to prevent the chip size of the nonvolatile semiconductor memory from increasing.
- the source line on the drain region has a protruding portion that protrudes toward the source region.
- the source line on the drain region is wired using a lower wiring layer than the source line on the source region. For this reason, even when wiring more source lines than before, the wiring width of each source line can be increased without increasing the chip size, and the source resistance can be reduced.
- each cell group includes a plurality of nonvolatile memory cell pairs whose sources are connected to each other.
- the sources of the nonvolatile memory cell pairs facing each other are formed by a common diffusion layer. For this reason, the total area of the source diffusion layer can be reduced, and the chip size of the nonvolatile semiconductor memory can be reduced.
- the contact portion is formed between the cell group pair, and connects the source line formed using the wiring layer to the diffusion layer.
- Each source line is connected to the diffusion layer via a contact portion. Since the number of contact portions can be minimized, an increase in chip size can be prevented.
- each cell group pair the non-volatile memory cell pairs facing each other are connected to different source lines.
- Word line wiring Every other contact portion formed along the direction is connected to one and the other source line. Also in this example, the number of contact portions formed can be minimized, and an increase in chip size can be prevented.
- the source decoder sets the source line connected to the nonvolatile memory cell to be accessed to the ground voltage and sets the other source lines to the floating state when accessing the memory cell. Set. For this reason, even when a plurality of word lines are activated by pipeline processing, a memory cell current can flow only between the drain and source of the nonvolatile memory cell of interest. Therefore, in a nonvolatile semiconductor memory that executes a plurality of read operations in parallel, random access that sequentially accesses an arbitrary nonvolatile memory cell can be executed.
- the column decoder sets the bit line connected to the nonvolatile memory cell to be accessed to the drain voltage and sets the other bit lines to the floating state when accessing the memory cell. Set.
- a memory cell current can flow only between the drain and source of the nonvolatile memory cell of interest. Therefore, in a nonvolatile semiconductor memory that executes a plurality of read operations in parallel, random access that sequentially accesses arbitrary nonvolatile memory cells can be executed.
- random access without increasing the chip size can be executed in a nonvolatile semiconductor memory having a pipeline function.
- FIG. 1 is a block diagram showing an embodiment of a nonvolatile semiconductor memory of the present invention.
- FIG. 2 is a circuit diagram showing details of the memory cell array shown in FIG.
- FIG. 3 is a layout diagram showing details of the memory cell array shown in FIG. 1.
- FIG. 4 is a timing chart showing an example of a read operation of the flash memory according to the present invention.
- FIG. 5 is an explanatory diagram showing a state of a memory cell when read operations are continuously executed.
- FIG. 6 is a circuit diagram showing the state of the memory cell MC when the read operation is continuously executed. It is.
- FIG. 7 is a layout diagram showing an example of a memory cell array examined by the inventors before the present invention. BEST MODE FOR CARRYING OUT THE INVENTION
- Double circles in the figure indicate external terminals.
- the signal lines indicated by bold lines are composed of a plurality of lines.
- a part of the block to which the thick line is connected is composed of a plurality of circuits.
- the same symbol as the terminal name is used for the signal supplied via the external terminal.
- the same code as the signal name is used for the signal line through which the signal is transmitted.
- FIG. 1 shows an embodiment of a nonvolatile semiconductor memory of the present invention.
- This nonvolatile semiconductor memory is formed as a NOR type flash memory on a silicon substrate using a CMOS process.
- the flash memory has a command input circuit 10, a state machine 12, an address input circuit 14, a data input / output circuit 16, a word decoder 18, a source decoder 20, a column decoder 22, a data control circuit 24, and a memory cell array 26.
- a word core 18, a source decoder 20, a column decoder 22, a data control circuit 24, and a memory cell array 26 constitute a memory core 28.
- the command input circuit 10 decodes the command signal CMD received via the command terminal CMD, and notifies the state machine 12 of the decoded command.
- Examples of the command signal CMD include a chip enable signal, an output enable signal, and a write enable signal.
- the state machine 12 generates a plurality of timing signals for operating the flash memory in response to a command decoded by the command input circuit 10, and generates the generated timing signals in an internal circuit (address input circuit 14, data input / output circuit). 16, word decoder 18, source decoder 20, column decoder 22, data control circuit 24, etc.).
- the state machine 12 divides the operation of the internal circuit into a plurality of steps independent from each other in order to execute pipeline processing that executes a plurality of read operations (access operations) in parallel. Each step is sequentially executed by a timing signal.
- the noipline process will be described in Fig. 4 below.
- the address input circuit 14 outputs an address signal AD received via the address terminal AD to the node decoder 18, the source decoder 20 and the column decoder 22.
- Adore A predecoder for predecoding the source signal AD may be arranged between the address input circuit 14 and the word decoder 18, the source decoder 20 and the column decoder 22.
- the data input / output circuit 16 outputs data read from the memory cell array 26 to the data terminal DQ.
- the data input / output circuit 16 receives data to be written to the memory cell array 26 via the data terminal DQ.
- a part of the command signal may be received by the data terminal DQ, and the state machine 12 may determine the operation command in combination with the command signal CMD received by the command terminal CMD.
- the word decoder 18 selects one of the word lines WL according to the address signal AD when accessing the memory cell MC.
- the word decoder 18 has a function of overlapping a part of the active period of the word line WL with each other under the control of the state machine 12 when read operations are continuously executed and different word lines WL are sequentially selected.
- the source decoder 20 sets the source line SL selected by the address signal AD to the ground voltage and sets the other source lines SL to the floating state. That is, the source line SL connected to the nonvolatile memory cell MC to be accessed is set to the ground voltage, and the other source lines SL are set to the floating state.
- the column decoder 22 sets the bit line BL selected by the address signal AD to the drain voltage (for example, IV) and sets the other bit lines BL to the floating state. That is, the bit line BL connected to the nonvolatile memory cell to be accessed is set to the drain voltage, and the other bit lines BL are set to the floating state.
- the drain voltage for example, IV
- the data control circuit 24 includes a sense amplifier, a data write circuit, etc., not shown.
- the sense amplifier detects the memory cell current flowing between the drain and source of the memory cell MC during the read operation, and determines the logical value of the data held in the memory cell MC.
- the write circuit controls the data write operation (program) and erase operation.
- the memory cell array 26 has a plurality of nonvolatile memory cells MC arranged in a matrix. Each memory cell MC is composed of a memory cell transistor having a floating gate. The control gate of the memory cell MC is connected to one of the word lines WL (WLO, 1,). The drain of the memory cell MC is connected to the bit line BL (BLO, 1 ,...) The source of the memory cell MC is connected to one of the source lines SL (SLO, 1,). Details of the memory cell array 26 will be described with reference to FIGS.
- FIG. 2 shows details of the circuit of the memory cell array 26 shown in FIG.
- the memory cell array 26 has a plurality of cell groups CG configured by connecting memory cells MC in series.
- Each cell group CG is composed of a non-volatile memory cell pair MCP (an ellipse frame in the figure) composed of a pair of memory cells MC whose sources are connected to each other.
- the cell groups CG are arranged in the wiring direction of the word lines WL (the left-right direction in the figure).
- a cell group pair CGP is composed of a pair of cell groups adjacent to each other!
- a pair of bit lines BL (for example, BL0 and BL1) are wired for each cell group pair CGP along the orthogonal direction of the word line WL.
- the bit line pairs BL are wired in a zigzag pattern while crossing each other.
- each cell group pair CGP the source of each memory cell pair MCP facing each other is formed by a common diffusion layer (dashed square frame).
- two non-volatile memory cell pairs MCP facing each other are connected to different source lines SL.
- two memory cell pairs MCP connected to word lines WL1 and WL2 are connected to different source lines SL1 and SLO, respectively.
- two memory cell pairs MCP (including four memory cells MC) facing each other in each cell group pair CGP are also referred to as memory cell groups.
- the combinations of the bit line BL and the source line SL connected to the drain and source of the memory cell MC are all different.
- At least one of the word line pair WL and the bit line pair BL is different from each other in the plurality of memory cell groups. Therefore, by arranging bit line pairs BL in a zigzag manner and making source lines SL of two memory cell pairs MCP facing each other in each cell group pair CGP different, a memory cell without increasing the layout size of the memory cell array 26 is obtained. All combinations of bit line BL and source line SL connected to the drain and source of MC can be made different.
- FIG. 3 shows details of the layout of the memory cell array 26 shown in FIG.
- thick A broken line frame indicates a diffusion layer formed on the semiconductor substrate.
- the word lines WL indicated by hatching are formed using polysilicon (Poly-Si).
- the bit line BL shown by a thick solid line is formed using the first metal wiring layer Ml and the second metal wiring layer M2.
- the source line SL indicated by a thin solid line is formed of the third metal wiring layer M3 and the fourth metal wiring layer M4.
- the metal wiring layers are formed on the semiconductor substrate in the order of Ml, M2, M3, and M4.
- a square frame with an X indicates a contact portion C NT (plug) for connecting the diffusion layer to the metal wiring layer.
- the contact part CNT of the bit line BL is indicated by a thick square frame, and the contact part CNT of the source line SL is indicated by a thin square frame.
- the shaded area indicates one memory cell MC.
- the width of a part of the wiring is shown to be narrower than the actual width in order to clarify the distinction of the wiring. Actually, each wiring has a width that satisfies the layout design standard.
- the bit line pair BL intersects on the source region.
- the source region where the source of the memory cell MC is formed and the drain region where the drain of the memory cell MC is formed are alternately formed between the word lines WL.
- the thick broken line frame in the source region indicates the source diffusion layer, and the thick broken line in the drain region indicates the drain diffusion layer.
- the source lines SL0, SL2,... With even numbers are formed on the drain region.
- Source lines SL1, 3,... With odd numbers are formed on the source region.
- a pair of source lines SL connected to the sources of the memory cell pair MCP facing each other are wired on the source region and the drain region, respectively.
- each cell group pair CGP the memory cell pairs MCP facing each other are connected to different source lines SL.
- the source line SL By forming the source line SL on the source region and the drain region, a larger number of source lines than before can be wired without increasing the size of the memory cell array.
- the wiring width of each source line SL can be increased without increasing the chip size, and the source resistance can be reduced.
- the source line SL on the source region is directly connected to the diffusion layer via the contact portion CNT.
- the source line SL on the drain region has a protruding portion PP that protrudes to the source diffusion layer toward the source region.
- the source line SL on the drain region is connected to the protrusion PP and the Contact part Connected to the diffusion layer via CNTs.
- Each contact CNT is formed between a cell-doop and CGP. Every other contact portion CNT formed along the wiring direction of the word line WL (the horizontal direction in the figure) is connected to the source line SL on the source region and the source line SL on the drain region.
- the source of each memory cell pair MCP facing each other is formed by a common diffusion layer. For this reason, the number of contact CNTs formed can be minimized, and the total area of the source diffusion layer can be reduced. Therefore, the chip size of the flash memory can be reduced.
- the contact part CNT between the cell group and CGP it is possible to prevent the contact part CNT of the source line from shorting with the bit line BL.
- FIG. 4 shows an example of the read operation of the flash memory of the present invention.
- the flash memory continuously receives the address signal AD (ADO, AD1,%) Together with the read command, and continuously executes the read operation.
- the read data DQ (DQO, DQ1,...) Is output continuously by executing the read operation.
- the latency until the data signal DQ is output after the address signal AD is supplied is "4".
- the present invention can also be applied to read operations with a latency other than “4”.
- One read operation includes four steps.
- the four steps are the address signal AD detection step (ATD), the word line WL activation step (WL), the data read step (BL, SL, SA) and the data output step (DOUT).
- ATD indicates the selection and determination period of address signal AD (detection of transition of address signal AD).
- WL indicates a selection period (boost period) of the word line WL.
- BL indicates a selection period of the bit line BL.
- SL indicates a selection period of the source line SL.
- SA indicates the data judgment period by the sense amplifier.
- DOUT indicates the data output period.
- Pipeline processing By configuring one read operation by a plurality of steps that are independent from each other, pipeline processing that executes a plurality of read operations in parallel becomes possible. Pipeline processing shortens the external read cycle, which is the output cycle of the data signal DQ, and improves the data transfer rate.
- the word line WL needs to continue active until data is read. For this reason, the period of the activation step of the word line WL includes the period of the data reading step (BL, SL, SA). In other words, in the current read operation, when the word line WL is activated and a data read step is being performed, another word line WL is activated for the next read operation. . For this reason, some of the activation steps of the word line WL overlap each other when the read operation continues.
- the conventional nonvolatile semiconductor memory having the pipeline function cannot execute the pipeline operation shown in FIG. 4 in the random access in which the read operation is executed in response to any continuous address signal AD.
- all combinations of the bit line BL and the source line SL connected to the drain and source of the memory cell MC are made different! /, Therefore, pipeline operation is executed for random access. it can.
- FIG. 5 shows a state of the memory cell MC when the read operation is continuously executed.
- the memory cell MC for reading data receives a boosted voltage (for example, 5V) at the gate G, a drain voltage (for example, IV) at the drain D, and a ground voltage (OV) at the source S. Then, the logic held in the memory cell MC is determined according to the memory cell current flowing between the drain and the source.
- the gate voltage is set by the word decoder 18 under the control of the state machine 12.
- the drain voltage is set by the column decoder 22 under the control of the state machine 12.
- the source voltage is set by the source decoder 20 under the control of the state machine 12.
- the flash memory reads a memory cell MC to be read next while a certain memory cell MC is reading, that is, during a period when a certain word line WL is set to a boost voltage.
- the connected word line WL is set to the boost voltage.
- the memory cell current force of the memory cell MC to be read next flows to the bit line BL or source line SL connected to the memory cell MC being read, the data of the memory cell MC being read cannot be correctly determined.
- the memory cell MC to be read next (memory cell MC whose word line WL is set to the boosted voltage) is in any one of states A, B, and C so that no memory cell current flows.
- the force to set the rotating state (open) or the voltage between the drain, DZ, and source S must be set to OV. Specifically, in state A, drain D is set to open or OV (source voltage). In state B, source S is set to open or IV (drain voltage).
- FIG. 6 shows a state of the memory cell MC when the read operation is continuously executed.
- a read operation is performed on the memory cell MC indicated by a circle.
- the word line WL3, the bit line BL3, and the source line SL2 indicated by bold lines are set to the boost voltage, the drain voltage, and the ground voltage, respectively.
- Symbols A, B, and C shown beside each memory cell MC indicate states A, B, and C (FIG. 5) when the boosted voltage is supplied to the word line WL, respectively.
- FIG. 7 shows a layout example of the memory cell array examined by the inventors before the present invention.
- bit lines BL are wired in a zigzag pattern using metal wiring layers Ml and M2, and source lines SL are wired using metal wiring layers M3 and M4, compared to a conventional memory cell array.
- a contact portion C NT connecting the source line SL to the source diffusion layer of the memory cell MC is formed for each memory cell MC.
- the bit lines BL need to intersect on the source region. For this reason, the bit line BL and the contact portion CNT of the source region are short-circuited. If the distance between the bit line BL and the contact part CNT is increased to avoid a short circuit, the size of the memory cell array increases. As shown in FIG. 3, the bit line BL that does not increase the size of the memory cell array by arranging the contact CNT of the source region in common between adjacent cell group pairs CGP. And the contact portion CNT of the source region can be prevented from being short-circuited.
- all combinations of the bit lines BL and the source lines SL connected to the drain and source of the memory cell MC are made different. Can do.
- the source decoder 20 sets the source line SL connected to the memory cell MC to be accessed to the ground voltage, and sets the other source lines SL to the floating state.
- the column decoder 22 sets the bit line BL connected to the memory cell MC to be accessed to the drain voltage, and sets the other bit lines BL to the floating state. Therefore, random access (random read) can be executed in a flash memory having a pipeline function that executes a plurality of read operations in parallel.
- the pair of bit lines BL are wired in a zigzag manner while intersecting each other.
- the contact portion CNT of the source line SL is formed between adjacent cell group pairs CGP in order to be shared by a plurality of memory cells MC.
- By sharing the contact portion CNT it is possible to configure a flash memory that has a pipeline function that does not increase the size of the memory cell array 26 and can execute random access.
- By wiring the source lines SL on the drain region and the source region using the metal wiring layers M3 and M4 it is possible to wire more source lines without increasing the size of the memory cell array.
- bit lines BL can be wired without crossing each other, and the same effect can be obtained even if the source lines cross each other and are wired in a zigzag manner for each source line pair having two source line forces. it can.
- each memory cell MC is configured by a memory cell transistor having a floating gate.
- the present invention is not limited to such embodiments.
- the same effect can be obtained even if each memory cell MC is constituted by a memory cell transistor having a trap gate.
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Abstract
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP2004/011751 WO2006018862A1 (ja) | 2004-08-16 | 2004-08-16 | 不揮発性半導体メモリ |
JP2006531100A JP4511539B2 (ja) | 2004-08-16 | 2004-08-16 | 不揮発性半導体メモリ |
CN2004800437889A CN101002278B (zh) | 2004-08-16 | 2004-08-16 | 非易失性半导体存储器 |
US11/707,130 US7864576B2 (en) | 2004-08-16 | 2007-02-16 | Nonvolatile memory cell array architecture for high speed reading |
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PCT/JP2004/011751 WO2006018862A1 (ja) | 2004-08-16 | 2004-08-16 | 不揮発性半導体メモリ |
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US11/707,130 Continuation US7864576B2 (en) | 2004-08-16 | 2007-02-16 | Nonvolatile memory cell array architecture for high speed reading |
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WO2006018862A1 true WO2006018862A1 (ja) | 2006-02-23 |
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US (1) | US7864576B2 (ja) |
JP (1) | JP4511539B2 (ja) |
CN (1) | CN101002278B (ja) |
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JP2006086286A (ja) * | 2004-09-15 | 2006-03-30 | Renesas Technology Corp | 半導体装置およびicカード |
JP2008077826A (ja) * | 2006-09-22 | 2008-04-03 | Samsung Electronics Co Ltd | 不揮発性記憶装置及びその動作方法 |
US7961515B2 (en) | 2006-07-14 | 2011-06-14 | Semiconductor Energy Laboratory Co., Ltd. | Nonvolatile memory |
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JP2007179639A (ja) * | 2005-12-27 | 2007-07-12 | Elpida Memory Inc | 半導体記憶装置 |
US7817454B2 (en) | 2007-04-03 | 2010-10-19 | Micron Technology, Inc. | Variable resistance memory with lattice array using enclosing transistors |
JP2009123294A (ja) * | 2007-11-15 | 2009-06-04 | Panasonic Corp | 半導体不揮発性メモリ |
KR102131812B1 (ko) | 2013-03-13 | 2020-08-05 | 삼성전자주식회사 | 소스라인 플로팅 회로, 이를 포함하는 메모리 장치 및 메모리 장치의 독출 방법 |
CN106205703B (zh) * | 2016-07-04 | 2020-01-17 | 上海华虹宏力半导体制造有限公司 | 存储器阵列及其读、编程、擦除操作方法 |
CN112309468A (zh) * | 2019-07-30 | 2021-02-02 | 华邦电子股份有限公司 | 用于快速读取的存储器装置及其控制方法 |
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US6288938B1 (en) * | 1999-08-19 | 2001-09-11 | Azalea Microelectronics Corporation | Flash memory architecture and method of operation |
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JP2003282823A (ja) * | 2002-03-26 | 2003-10-03 | Toshiba Corp | 半導体集積回路 |
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2004
- 2004-08-16 WO PCT/JP2004/011751 patent/WO2006018862A1/ja active Application Filing
- 2004-08-16 CN CN2004800437889A patent/CN101002278B/zh not_active Expired - Fee Related
- 2004-08-16 JP JP2006531100A patent/JP4511539B2/ja not_active Expired - Fee Related
-
2007
- 2007-02-16 US US11/707,130 patent/US7864576B2/en not_active Expired - Fee Related
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JPH07114796A (ja) * | 1993-10-19 | 1995-05-02 | Oki Electric Ind Co Ltd | 半導体不揮発性メモリ |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006086286A (ja) * | 2004-09-15 | 2006-03-30 | Renesas Technology Corp | 半導体装置およびicカード |
US7961515B2 (en) | 2006-07-14 | 2011-06-14 | Semiconductor Energy Laboratory Co., Ltd. | Nonvolatile memory |
TWI466269B (zh) * | 2006-07-14 | 2014-12-21 | Semiconductor Energy Lab | 非揮發性記憶體 |
JP2008077826A (ja) * | 2006-09-22 | 2008-04-03 | Samsung Electronics Co Ltd | 不揮発性記憶装置及びその動作方法 |
Also Published As
Publication number | Publication date |
---|---|
CN101002278B (zh) | 2011-11-16 |
JPWO2006018862A1 (ja) | 2008-05-01 |
CN101002278A (zh) | 2007-07-18 |
JP4511539B2 (ja) | 2010-07-28 |
US7864576B2 (en) | 2011-01-04 |
US20070140039A1 (en) | 2007-06-21 |
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