Integrated circuit for switching from power supply to battery, i

Details Integrated circuit for switching from power supply to battery, i Integrated circuit for switching from power supply to battery, i

1997-12-31

2000-06-13

Nelms, David

Static information storage and retrieval

Powering

Data preservation

365226, 365227, 365203, G11C 700

Patent

active

060757426

ABSTRACT:
An integrated circuit and associated method for switching from a power supply to a battery are provided. The integrated circuit preferably includes a memory circuit responsive to an external power supply and to a battery for storing data therein and a sleep mode latching circuit connected to the memory circuit for latching the memory circuit in a reduced power sleep mode condition so as to reduce power usage of a battery and a non-sleep mode operating condition so as to allow normal operation of the memory circuit by a power supply. The integrated circuit preferably also includes a sleep mode latch locking circuit connected to the sleep mode latching circuit and the memory circuit and responsive to a power supply for locking the sleep mode latching circuit in the non-sleep mode operating condition when power supplied from the power supply falls below a predetermined threshold so that the memory circuit is inhibited from inadvertently entering the reduced power sleep mode condition.

REFERENCES:
patent: 5008776 (1991-04-01), Queyssac
patent: 5031092 (1991-07-01), Edwards et al.
patent: 5089877 (1992-02-01), Queyssac et al.
patent: 5115146 (1992-05-01), McClure
patent: 5121358 (1992-06-01), Slemmer et al.
patent: 5134587 (1992-07-01), Steele
patent: 5144582 (1992-09-01), Steele
patent: 5161159 (1992-11-01), McClure et al.
patent: 5204279 (1993-04-01), Chan et al.
patent: 5557188 (1996-09-01), Piercey
patent: 5892893 (1999-04-01), Hanf et al.

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