Semiconductor memory device and method of refreshing semiconduct

Details Semiconductor memory device and method of refreshing semiconduct Semiconductor memory device and method of refreshing semiconduct

1998-11-24

1999-07-20

Phan, Trong

Static information storage and retrieval

Read/write circuit

Data refresh

3652257, 365226, G11C 700

Patent

active

059264292

ABSTRACT:
A semiconductor memory device includes memory elements, each maintaining memory contents within a period of time during which a refresh operation is repeated, and a refresh request circuit for making a refresh request. The semiconductor memory device includes refreshing circuits each of which, in response to a refresh request from the refresh request circuit, performs a refresh operation on a different number of memory elements at the same time, and a selecting circuit for selecting one refreshing circuit from among the refreshing circuits according to the number of memory elements included in the semiconductor memory device. The refresh request circuit can change the interval at which it makes a refresh request.

REFERENCES:
patent: 4849936 (1989-07-01), Mizutani
patent: 5323352 (1994-06-01), Miyata et al.
patent: 5627791 (1997-05-01), Wright et al.
patent: 5805524 (1998-09-01), Kotani et al.
patent: 5812475 (1998-09-01), Lee et al.

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