Low leakage data retention power supply circuit

Details Low leakage data retention power supply circuit Low leakage data retention power supply circuit

1997-03-24

1998-03-03

Nelms, David C.

Static information storage and retrieval

Powering

Data preservation

365228, 365226, G11C 700

Patent

active

057242984

ABSTRACT:
A data storage device requires a nominal input supply voltage, within a range having upper and lower tolerance limits in which stored data is retained. A capacitor is coupled to the data storage device. A supply voltage has a voltage greater than at least the upper tolerance limit. A regulator energized by the power supply provides a regulated voltage to the data storage device and the capacitor, the regulator presenting a low leakage discharge path for the capacitor. A feedback circuit is coupled to the regulated voltage and the regulator, the regulated voltage being held, preferably precisely held, at a voltage level between the nominal input supply voltage and the upper tolerance limit. The capacitor energizes the data storage device following an interruption of power from the power supply, discharging very slowly through the low leakage discharge path. The stored data is retained for an extended period of time.

REFERENCES:
patent: 5058075 (1991-10-01), Mizuta
patent: 5568441 (1996-10-01), Sanemitsu
"Battery Back-Up Power Supply", IBM Technical Disclosure Bulletin, vol. 23, No. 3, Aug. 1980, pp. 1240-1241.
Paul Horowitz and Winfield Hill, The Art of Electronics, Copyright .COPYRGT. Cambridge University Press 1980, England, Reprinted 1983 in USA, p. 213.
TL431C, TL431AC, TL431I, TL431AI, TL431M, TL431Y Adjustable Precision Shunt Regulators, Copy .COPYRGT. 1996, Texas Instruments Incorporated, pp. 8-18.

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