Self-refresh control circuit

Details Self-refresh control circuit Self-refresh control circuit

2006-05-02

2006-05-02

Tran, Michael (Department: 2827)

Static information storage and retrieval

Read/write circuit

Data refresh

C365S211000

Reexamination Certificate

active

07038968

ABSTRACT:
A self-refresh control circuit can be simplified by using a division value generated from an Extended Mode Register Set (EMRS) at low temperature without a limiter used in a Temperature Compensated Self Refresh (TCSR). The self-refresh control circuit comprises an EMRS TCSR basic cycle generating unit, a temperature sensor, a division setting unit and a self-refresh operating cycle generating unit. The EMRS TCSR basic cycle generating unit generates an EMRS TCSR basic cycle using a division value of an EMRS code. The temperature sensor generates a detecting signal depending on temperature monitored in a chip. The division setting unit generates a reference cycle by multiplying the EMRS TCSR basic cycle by a division value of the EMRS code selected in response to a selecting signal or by a division value corresponding to the detecting signal. The self-refresh operating cycle generating unit generates a self-refresh operating cycle with the reference cycle.

REFERENCES:
patent: 5710911 (1998-01-01), Walsh et al.
patent: 5822550 (1998-10-01), Milhaupt et al.
patent: 5867717 (1999-02-01), Milhaupt et al.
patent: 6721223 (2004-04-01), Matsumoto et al.

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