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    • 2. 发明授权
    • Redundancy circuit for repairing defective bits in semiconductor memory
device
    • 用于修复半导体存储器件中的有缺陷的位的冗余电路
    • US5574729A
    • 1996-11-12
    • US338817
    • 1994-11-10
    • Mitsuya KinoshitaShigeru MoriYoshikazu MorookaHiroshi MiyamotoShigeru KikudaMakoto Suwa
    • Mitsuya KinoshitaShigeru MoriYoshikazu MorookaHiroshi MiyamotoShigeru KikudaMakoto Suwa
    • G11C11/401G11C29/00G11C29/04G06F11/00
    • G11C29/848
    • A semiconductor memory device includes a plurality of memory blocks, i main row or column select lines extending over the plurality of memory blocks, and a decoder for selecting one of the main row or column select lines in accordance with an applied address signal. The decoder includes i outputs. Each of the memory blocks includes a plurality of memory cells arranged in rows and columns and at least (i+1) sub row or column select lines each for selecting one row or one column of memory cells. A shift redundancy circuit is provided for each of the memory blocks, for connecting the main row or column select line and the sub row or column select line. The shift redundancy circuit includes a switch circuit for connecting one main row or column select line to one of the plurality of adjacent sub row or column select lines, and a circuit for setting a connection path of the switch circuit. The shift redundancy circuit connects successively adjacent sub row or column select lines to main row or column select lines in one to one correspondence except a defective sub row or column select line associated with a defective bit.
    • 一种半导体存储器件包括多个存储块,i个在多个存储块上延伸的主行或列选择线,以及用于根据所施加的地址信号选择主行或列选择线中的一个的解码器。 解码器包括i个输出。 每个存储块包括排列成行和列的多个存储器单元和至少(i + 1)个子行或列选择线,每个用于选择一行或一列存储单元。 为每个存储块提供移位冗余电路,用于连接主行或列选择线和子行或列选择线。 移位冗余电路包括用于将一个主行或列选择线连接到多个相邻子行或列选择线中的一个的开关电路和用于设置开关电路的连接路径的电路。 除了与有缺陷的位相关联的有缺陷的子行或列选择线之外,移位冗余电路将连续相邻的子行或列选择线以一对一的对应方式连接到主行或列选择线。
    • 4. 发明授权
    • Semiconductor memory device having test mode
    • 具有测试模式的半导体存储器件
    • US5204837A
    • 1993-04-20
    • US744750
    • 1991-08-14
    • Makoto SuwaHiroshi Miyamoto
    • Makoto SuwaHiroshi Miyamoto
    • G11C29/00G11C11/401G11C29/14G11C29/46H01L21/8242H01L27/10H01L27/108
    • G11C29/46
    • A DRAM includes a test mode controller generating a test mode designating signal designating a test mode at a fall of an external control signal RAS when the logical levels of external control signals CAS and WE are low, and a power-on reset circuit responsive to a power supply for generating a reset pulse for resetting main circuits for data reading and data writing. Each of the external control signals CAS and WE are supplied to the test mode controller and the main circuits through a buffer circuit. A first buffer circuit for supplying the external control signal RAS to the test mode controller is provided separately from a second buffer circuit for supplying the external control signal RAS to the main circuits. The second buffer circuit receives the output of the power-on reset circuit and the external control signal RAS to buffer the control signal RAS only when no reset pulse is generated. The first buffer circuit receives only the external control signal RAS to continuously buffer the same without being affected by a reset pulse.
    • DRAM包括一个测试模式控制器,当外部控制信号&upbar&C和& upbar&W的逻辑电平为低电平时,产生一个测试模式指定信号,在外部控制信号和上升沿和下拉沿指定测试模式;以及上电复位电路 响应于电源产生用于复位用于数据读取和数据写入的主电路的复位脉冲。 每个外部控制信号&upbar&C和& upbar&W通过缓冲电路提供给测试模式控制器和主电路。 与外部控制信号和上行&R连接到主电路的第二缓冲电路分开设置用于将外部控制信号和上行& R提供给测试模式控制器的第一缓冲电路。 第二个缓冲电路接收上电复位电路的输出和外部控制信号和上拉和下拉,只有在没有产生复位脉冲时才缓冲控制信号和上拉电阻&R。 第一个缓冲电路仅接收外部控制信号&上拉和下拉以连续缓冲,而不受复位脉冲的影响。