Semiconductor memory device

Details Semiconductor memory device Semiconductor memory device

1991-04-18

1994-01-11

Mullins, James B.

Static information storage and retrieval

Powering

Data preservation

307 66, G11C 700

Patent

active

052787982

ABSTRACT:
The semiconductor memory device comprises first and second terminals connected to first and second power sources, respectively; a detection circuit for outputting a detection signal when the second power source voltage becomes higher by a predetermined value than the first power source voltage; a power source switching circuit for controlling the memory device so that power is supplied from the second power source, in response to the detection signal; and a data hold control circuit for controlling the memory device so that data are kept stored therein in response to the detection signal. Since these circuits are incorporated inside the chip, the packaging efficiency or density of the memory devices can be improved when the memory devices are integrated on a semiconductor substrate.

REFERENCES:
patent: 4313180 (1982-01-01), Mochizuki et al.
patent: 4908790 (1990-03-01), Little et al.
Power Switching Circuit, Fink, et al, "MOS Memory Components Handbook", 1987, pp. 3-83 to 3-85.

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