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    • 6. 发明授权
    • Semiconductor memory device with a stacked gate including a floating gate and a control gate
    • 具有包括浮动栅极和控制栅极的堆叠栅极的半导体存储器件
    • US07505324B2
    • 2009-03-17
    • US11533051
    • 2006-09-19
    • Akira UmezawaKazuhiko Kakizoe
    • Akira UmezawaKazuhiko Kakizoe
    • G11C16/04
    • H01L27/105G11C11/005G11C16/0433G11C16/0483G11C16/08H01L27/0629H01L27/092H01L27/11531
    • A semiconductor memory device comprises a first to a fourth semiconductor layer of a first conductivity type which are formed in a fifth semiconductor layer of a second conductivity type in such a manner that they are isolated from one another, memory cells each of which includes a first MOS transistor formed on the first semiconductor layer, a second and a third MOS transistor which are formed on the second and third semiconductor layers, respectively, a first metal wiring layer which connects the gate of the first MOS transistor to the source or drain of at least one of the second and third MOS transistors, and a first contact plug which connects the fourth semiconductor layer to the first metal wiring layer. The first wiring layer is in the lowest layer of the metal wiring lines connected to the gate of the first MOS transistor.
    • 半导体存储器件包括第一导电类型的第一至第四半导体层,它们以彼此隔离的方式形成在第二导电类型的第五半导体层中,每个存储单元包括第一 形成在第一半导体层上的MOS晶体管,分别形成在第二和第三半导体层上的第二和第三MOS晶体管,分别将第一MOS晶体管的栅极连接到源极或漏极的第一金属布线层 第二和第三MOS晶体管中的至少一个以及将第四半导体层连接到第一金属布线层的第一接触插塞。 第一布线层位于与第一MOS晶体管的栅极连接的金属布线的最下层。
    • 8. 发明授权
    • Electrically erasable and programmable nonvolatile semiconductor memory device having data holding function and data holding method
    • 具有数据保持功能和数据保持方法的电可擦除和可编程的非易失性半导体存储器件
    • US06188610B1
    • 2001-02-13
    • US09497175
    • 2000-02-03
    • Kazuhiko KakizoeToru Okawa
    • Kazuhiko KakizoeToru Okawa
    • G11C700
    • G11C16/3431G11C16/3418
    • Data of a memory cell in a cell array is read out by a readout circuit by use of a word line potential which is the same as that at the program verify time. After the end of the readout operation, data of the same memory cell is read out by the readout circuit by use of a word line potential (refresh verify potential) which is lower than the word line potential at the program verify time and higher than the word line potential at the read time. Then, data read out by use of the word line potential which is the same as that at the program verify time is compared with data read out by use of the word line potential which is set at the refresh verify potential and whether or not the additional write operation for holding data is effected for the memory cell is determined according to the result of comparison.
    • 通过使用与程序验证时间相同的字线电位,由读出电路读出单元阵列中的存储单元的数据。 在读出操作结束之后,通过使用在程序验证时间比字线电位低的字线电位(刷新验证电位),由读出电路读出同一个存储单元的数据,高于 读取时的字线电位。 然后,将通过使用与程序验证时间相同的字线电位读出的数据与通过设置在刷新验证电位的字线电位读出的数据进行比较,以及附加 根据比较结果确定存储单元的保持数据的写操作。