Low voltage power down logic control circuit

Details Low voltage power down logic control circuit Low voltage power down logic control circuit

1987-05-06

1989-05-16

Moffitt, James W.

Static information storage and retrieval

Powering

Data preservation

G11C 700

Patent

active

048315958

ABSTRACT:
A power down logic control circuit employing a diode and a capacitor to develop a voltage from a main power supply which normally holds a transistor in an "off" state. Upon disconnection of the main supply, the transistor switches "on" and activates a second transistor. Upon activation, the second transistor produces an inhibit signal to tri-state memory control circuitry and thereby preserve the memory data during transition to standby memory power provided by a lithium battery.

REFERENCES:
patent: 4399524 (1983-08-01), Maguruma et al.
patent: 4422163 (1983-12-01), Oldenkamp
patent: 4580248 (1986-04-01), Imaizumi
patent: 4611302 (1986-09-01), Bockett-Pugh

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