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    • 2. 发明申请
    • Nonvolatile semiconductor memory device
    • 非易失性半导体存储器件
    • US20020097596A1
    • 2002-07-25
    • US10086869
    • 2002-03-04
    • Kabushiki Kaisha Toshiba
    • Shigeru AtsumiHironori Banba
    • G11C005/06G11C011/34
    • G11C16/16G11C16/08
    • A nonvolatile semiconductor memory device comprises a row decoder circuit having first and second N-channel MOS transistors and first and second P-channel MOS transistors which correspond to each of word lines. One end of a source-to-drain current path of the first N-channel MOS transistor is connected to the word line, and the other end thereof is connected to a corresponding one of output terminals of a predecoder circuit. One end of a source-to-drain current path of the second N-channel MOS transistor is connected to the word line, and the other end thereof is supplied with a voltage of 0V or more in a data erase mode and is supplied with a low logical level signal in modes other than the data erase mode. A source-to-drain current path of the first P-channel MOS transistor is connected in parallel to the source-to-drain current path of the first N-channel MOS transistor, and a source-to-drain current path of the second P-channel MOS transistor is connected in parallel to the source-to-drain current path of the second N-channel MOS transistor.
    • 非易失性半导体存储器件包括具有第一和第二N沟道MOS晶体管的行解码器电路和对应于每条字线的第一和第二P沟道MOS晶体管。 第一N沟道MOS晶体管的源极 - 漏极电流路径的一端连接到字线,并且其另一端连接到预解码器电路的对应的一个输出端。 第二N沟道MOS晶体管的源极 - 漏极电流路径的一端连接到字线,并且其另一端在数据擦除模式下被提供0V以上的电压,并被提供有 低数据擦除模式以外的模式下的低逻辑电平信号。 第一P沟道MOS晶体管的源极 - 漏极电流路径并联连接到第一N沟道MOS晶体管的源极 - 漏极电流路径,并且第二P沟道MOS晶体管的源极 - 漏极电流路径 P沟道MOS晶体管与第二N沟道MOS晶体管的源极 - 漏极电流路径并联连接。
    • 5. 发明申请
    • Power supply circuit and semiconductor memory device having the same
    • 电源电路和半导体存储器件具有相同的功能
    • US20020021611A1
    • 2002-02-21
    • US09983258
    • 2001-10-23
    • Kabushiki Kaisha Toshiba
    • Hironori BanbaShigeru Atsumi
    • G11C005/14
    • G11C16/30G11C5/145H02M3/073
    • A number of booster circuits to be operated out of a plurality of booster circuits are selected in accordance with a level of the boosted voltage to be provided at a common voltage output terminal of the plurality of booster circuits. With such an arrangement, fluctuations in the output voltage that can appear when a light load is applied to the voltage output terminal of the booster circuits can be effectively reduced to make the semiconductor memory device driven by the power supply circuit operate reliably. Further, one of the output terminals of intermediate voltage booster circuits is connected to the output terminal of a high voltage booster circuit. Then, a desired voltage can be obtained from the booster circuits that are implemented without using costly transistors to reduce the chip cost.
    • 根据要提供在多个升压电路的公共电压输出端的升压电压的电平来选择要从多个升压电路中操作的多个升压电路。 通过这样的布置,可以有效地减少当将轻负载施加到升压电路的电压输出端子时可以出现的输出电压的波动,使由电源电路驱动的半导体存储器件可靠地工作。 此外,中压升压电路的输出端之一连接到高压升压电路的输出端。 然后,可以从不使用昂贵的晶体管而实现的升压电路获得期望的电压以降低芯片成本。