发明名称 |
Method of and apparatus for measuring information hold time of memory cell in dynamic MIS memory |
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.
|
申请公布号 |
US4044344(A) |
申请公布日期 |
1977.08.23 |
申请号 |
US19760685808 |
申请日期 |
1976.05.12 |
申请人 |
HITACHI, LTD. |
发明人 |
WADA, HIDETSUGU;ASANO, YOICHI;SUZUMURA, YOSHIKAZU |
分类号 |
G11C29/00;G11C11/24;G11C11/401;G11C11/406;G11C29/08;G11C29/50;G11C29/56;(IPC1-7):G11C11/40;G11C7/06 |
主分类号 |
G11C29/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|