Semiconductor memory which performs the refresh operation...

Details Semiconductor memory which performs the refresh operation... Semiconductor memory which performs the refresh operation...

2007-04-10

2007-04-10

Nguyen, Tuan T. (Department: 2824)

Static information storage and retrieval

Read/write circuit

Data refresh

C365S189070

Reexamination Certificate

active

11260201

ABSTRACT:
An oscillator generates a refresh request signal periodically. A storing circuit changes a stored value by a predetermined value in response to the refresh request signal and returns the stored value by one in response to a refresh operation. A store control circuit, when a state detecting circuit detects a change of an operational state of a semiconductor memory, increases or decreases the predetermined value which the storing circuit uses. A refresh decision circuit outputs refresh signals of a number corresponding to the stored value until the stored value returns to an initial value. This makes it possible to change the frequency of the refresh operations according to a change of the operational state without changing an oscillation cycle of the oscillator. Without unnecessary oscillation of the oscillator, it is possible to decrease a standby current of the semiconductor memory.

REFERENCES:
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patent: 5802555 (1998-09-01), Shigeeda
patent: 5870345 (1999-02-01), Stecker
patent: 6628560 (2003-09-01), Dosaka
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patent: 2 261 755 (1993-05-01), None
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patent: 2003-30983 (2003-01-01), None

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