Electronic apparatus with memory backup system

Details Electronic apparatus with memory backup system Electronic apparatus with memory backup system

1983-04-28

1986-04-01

Moffitt, James W.

Static information storage and retrieval

Powering

Data preservation

365195, G11C 2900

Patent

active

045802483

ABSTRACT:
An electronic apparatus comprising a memory and a memory backup power source for supplying power to the memory when normal power supply to the apparatus is interrupted; wherein after resumption of normal power supply to the apparatus, and error signal is generated when the voltage of the memory backup power source is below a predetermined value, indicating that the content of the memory is not reliable. Circuitry to inhibit recharging of the backup power source and prevent read/write operations during the voltage checking period is also included.

REFERENCES:
patent: 3859638 (1975-01-01), Hume, Jr.
patent: 4232377 (1980-11-01), Tallman
patent: 4451742 (1984-05-01), Aswell
Davies, "Battery Back-Up Voltage Monitor," New Electronics, vol. 13, No. 19, Sep. 30, 1980, p. 38.
Washburn, "Battery Backup for Minicomputer Semiconductor Memories", Computer Design, vol. 16, No. 4, Apr., 1977, pp. 108, 110, 112.
Bruni, "Keep Your Microcomputer Alive", Electronic Design 16, vol. 25, Aug. 2, 1977, pp. 80-81.
Mong, "Power Out Warning Interrupt Circuit", IBM Technical Disclosure Bulletin, vol. 18, No. 12, May 1976, pp. 4147-4149.

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