Semiconductor memory device improved for externally designating

Details Semiconductor memory device improved for externally designating Semiconductor memory device improved for externally designating

1990-08-10

1991-01-08

Fears, Terrell W.

Static information storage and retrieval

Read/write circuit

Data refresh

365233, G11C 1140, G11C 1300

Patent

active

049842102

ABSTRACT:
In a dynamic random access memory (DRAM), there is provided a refresh decision circuit which detects the external designation of a self refresh mode, in addition to a CAS before RAS refresh mode, by RAS and CAS signals. By detecting a time period of one cycle of the RAS, the self refresh mode is determined. As a result, the timing of change of the RAS signal is less restricted.

REFERENCES:
patent: 3737879 (1973-06-01), Greene et al.

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