发明授权
US4044344A Method of and apparatus for measuring information hold time of memory
cell in dynamic MIS memory
失效
用于测量动态MIS存储器中存储单元的信息保持时间的方法和装置
- 专利标题： Method of and apparatus for measuring information hold time of memory cell in dynamic MIS memory
- 专利标题（中）： 用于测量动态MIS存储器中存储单元的信息保持时间的方法和装置
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申请号： US685808申请日： 1976-05-12
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公开(公告)号： US4044344A公开(公告)日： 1977-08-23
- 发明人: Hidetsugu Wada , Yoichi Asano , Yoshikazu Suzumura
- 申请人： Hidetsugu Wada , Yoichi Asano , Yoshikazu Suzumura
- 申请人地址： JA
- 专利权人： Hitachi, Ltd.
- 当前专利权人： Hitachi, Ltd.
- 当前专利权人地址： JA
- 优先权： JA50-62901 19750528
- 主分类号： G11C29/00
- IPC分类号： G11C29/00 ; G11C11/24 ; G11C11/401 ; G11C11/406 ; G11C29/08 ; G11C29/50 ; G11C29/56 ; G11C11/40 ; G11C7/06
摘要：
In a MIS dynamic memory, information is written in the memory cell at a predetermined address, the access to other plural addresses is made for a fixed time period under such a condition that the memory cell of the predetermined address is not refreshed, and the stored information is thereafter read out of the memory cell of the predetermined address. The level of the read information is compared with a predetermined threshold value, thereby determining the information hold time of the memory cell.