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    • 16. 再颁专利
    • Electrically erasable programmable read-only memory with NAND cell
structure
    • 具有NAND单元结构的电可擦除可编程只读存储器
    • USRE35838E
    • 1998-07-07
    • US430271
    • 1995-04-28
    • Masaki MomodomiFujio MasuokaRiichiro ShirotaYasuo ItohKazunori OhuchiRyouhei Kirisawa
    • Masaki MomodomiFujio MasuokaRiichiro ShirotaYasuo ItohKazunori OhuchiRyouhei Kirisawa
    • G11C16/16G11C17/00
    • G11C16/16
    • An erasable programmable read-only memory with NAND cell structure is disclosed which has memory cells provided on a N type substrate. The memory cells are divided into NAND cell blocks each of which has a series array of memory cell transistors. Each of the transistors has a floating gate, a control gate connected to a word line and N type diffusion layers serving as its source and drain. These semiconductor layers are formed in a P type well layer formed in a surface area of a substrate. The well layer serves as a surface breakdown prevention layer. During a data erase mode data stored in all the memory cells are erased simultaneously. During the data write mode subsequent to the erase mode, when a certain NAND cell block is selected, memory cells in the NAND cell block are subjected to data writing in sequence. When data is written into a certain memory cell in the selected NAND cell block, a control gate of the certain memory cell is supplied with a voltage which is so high as to form a strong electric field to allow the tunneling of electrons between the floating gate of the memory cell and the well layer. Consequently, only the selected cell can be written into.
    • 公开了具有NAND单元结构的可擦除可编程只读存储器,其具有设置在N型衬底上的存储单元。 存储器单元被分成NAND单元块,每个单元块具有存储单元晶体管的串联阵列。 每个晶体管具有浮置栅极,连接到字线的控制栅极和用作其源极和漏极的N型扩散层。 这些半导体层形成在形成于基板的表面区域的P型阱层中。 阱层用作表面击穿防止层。 在数据擦除模式期间,存储在所有存储单元中的数据同时被擦除。 在擦除模式之后的数据写入模式期间,当选择某个NAND单元块时,NAND单元块中的存储单元依次进行数据写入。 当数据被写入所选择的NAND单元块中的某个存储单元中时,该特定存储单元的控制栅极被提供有如此高的电压,以形成强电场,以允许在浮置栅极 的存储单元和阱层。 因此,只能选择所选单元格。
    • 20. 发明授权
    • Electrically erasable programmable read-only memory with NAND
cellstructure
    • 具有NAND单元结构的电可擦除可编程只读存储器
    • US5050125A
    • 1991-09-17
    • US272404
    • 1988-11-17
    • Masaki MomodomiKoichi ToitaYasuo ItohYoshihisa IwataFujio MasuokaMasahiko ChibaTetsuo EndoRiichiro ShirotaRyouhei Kirisawa
    • Masaki MomodomiKoichi ToitaYasuo ItohYoshihisa IwataFujio MasuokaMasahiko ChibaTetsuo EndoRiichiro ShirotaRyouhei Kirisawa
    • G11C16/04G11C16/08G11C16/30H01L27/115
    • H01L27/115G11C16/0483G11C16/08G11C16/30
    • An erasable programmable read-only memory with a NAND cell structure including NAND cell blocks, each of which has a selection transistor connected to the corresponding bit line and memory cell transistors connected is series. Word lines are connected to control gates of the cell transistors. In a data write mode, a selection transistor of a certain cell block containing a selected cell is rendered conductive to connect the cell block to the corresponding bit line. A control circuit is provided for applying an "L" Level voltage (approximately O V) to a word line connected to the selected cell, applying an "H" level voltage (approximately 20 V) to a word line or word lines positioned between the selected word line and a contact node connecting the cell block and a specific bit line associated therewith, applying a voltage corresponding to data to be written to the specific bit line, and applying an intermediate voltage between the "H" and "L" level voltages to non-selected bit lines, thereby writing the data in the selected cell by tunneling. If the data is logic "0" data, the intermediate voltage is applied also to the specific bit line.
    • 具有包括NAND单元块的NAND单元结构的可擦除可编程只读存储器,每个NAND单元块具有连接到相应位线的选择晶体管和连接的存储单元晶体管。 字线连接到单元晶体管的控制栅极。 在数据写入模式中,包含所选择的单元的某个单元块的选择晶体管被导通以将单元块连接到对应的位线。 提供控制电路,用于向连接到所选择的单元的字线施加“L”电平电压(大约为0V),对位于所选择的单元之间的字线或字线施加“H”电平电压(大约20V) 字线和连接单元块和与其相关联的特定位线的接触节点,施加与要写入特定位线的数据相对应的电压,以及将“H”和“L”电平电压之间的中间电压施加到 未选择的位线,从而通过隧道将数据写入所选择的单元。 如果数据是逻辑“0”数据,则中间电压也被施加到特定位线。