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    • 18. 发明授权
    • Semiconductor memory and nonvolatile semiconductor memory having redundant circuitry for replacing defective memory cell
    • 具有用于替换有缺陷的存储单元的冗余电路的半导体存储器和非易失性半导体存储器
    • US06320800B1
    • 2001-11-20
    • US09583540
    • 2000-06-01
    • Hidetoshi SaitoMasao KuriyamaYasuhiko HondaHideo Kato
    • Hidetoshi SaitoMasao KuriyamaYasuhiko HondaHideo Kato
    • G11C700
    • G11C29/78G11C8/06G11C16/26G11C2216/22
    • Redundant cell arrays 201 of a plurality of columns are provided for replacing a defective bit line of a memory cell array 101. Each of the redundant cell arrays 201 is provided with a redundant sense amplifier circuit 105 separately from a sense amplifier circuit 103 of the memory cell array 101. A defective address storing circuit 108 stores a defective address of the memory cell array 101, an input/output terminal, to and from which data corresponding to the defective address are. to be inputted and outputted, and a column set number of the redundant cell array which is to be replaced in accordance with the input/output terminal. An address comparator circuit 109 detects the coincidence of an input address with the defective address. A switch circuit 112 is controlled by the coincidence detection output to switch one corresponding to the defective address of a sense amplifier circuit to one selected by the set number in the redundant sense amplifier circuit, to connect it to a data input/output buffer 113. Thus, it is possible to provide a semiconductor memory capable of effectively relieving a plurality of defective columns and a defect in a boundary region in column directions of the cell array.
    • 多个列的冗余单元阵列201被提供用于替换存储单元阵列101的有缺陷的位线。每个冗余单元阵列201设置有与存储器的读出放大器电路103分离的冗余读出放大器电路105 单元阵列101.缺陷地址存储电路108存储与缺陷地址对应的数据的存储单元阵列101的缺陷地址,输入/输出端。 输入和输出,以及根据输入/输出端子要替换的冗余单元阵列的列组号。 地址比较电路109检测输入地址与缺陷地址的一致性。 开关电路112由重合检测输出控制,将与读出放大器电路的缺陷地址对应的一个切换到由冗余读出放大器电路中的设定数字选择的一个,将其连接到数据输入/输出缓冲器113。 因此,可以提供能够有效地消除多个缺陷列的半导体存储器和单元阵列的列方向上的边界区域中的缺陷。