Semiconductor integrated circuit for controlling power source

Details Semiconductor integrated circuit for controlling power source Semiconductor integrated circuit for controlling power source

1995-02-06

1996-03-26

Fears, Terrell W.

Static information storage and retrieval

Powering

365227, 365229, G11C 1300

Patent

active

055026826

ABSTRACT:
A semiconductor integrated circuit for controlling a power source with which a power source potential on the basis of different external power source potentials, for example, 5 V and 3 V, can accurately be obtained. The semiconductor integrated circuit for switching between an external power source and a backup power source has an arrangement that, when the external power source potential is supplied to an external power source potential node, the potential at a first connection node on the basis of the external power source potential and a first reference potential of a first reference potential generating circuit are subjected to a comparison by a first comparator, and a first power source potential discriminating portion transmits a first comparison result signal. The potential of a second connection node and a second reference potential of a second reference potential generating circuit are subjected to a comparison by a second comparator, and a second power source potential discriminating portion transmits a second comparison result signal. If the potential of a setting node is high, a switching signal output portion transmits a switching signal corresponding to the first comparison result and transmits a switching signal corresponding to the second comparison result signal if the potential of the setting node is low. If the switching signal indicates a high level, a transistor connected to the external power source potential node is turned on. If the same indicates a low level, a transistor connected to the backup power source is turned on.

REFERENCES:
patent: 5448526 (1995-09-01), Horiguchi et al.

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