Semiconductor integrated circuit device having main power termin

Details Semiconductor integrated circuit device having main power termin Semiconductor integrated circuit device having main power termin

1991-01-30

1994-04-26

Fears, Terrell W.

Static information storage and retrieval

Powering

365227, G11C 1300

Patent

active

053073185

ABSTRACT:
A semiconductor integrated circuit device in which an internal circuit thereof is held by a backup power source when a main power source is disconnected comprises a comparator 29 for comparing a potential at a first power terminal 111 with that at a second power terminal 110. When the potential at the first power terminal is reduced switch means 212 connected between the first and second power terminals is closed to supply power from the second power terminal to a data storage unit 17 while forbidding write and read operations of store data.

REFERENCES:
patent: 4288865 (1981-09-01), Graham
patent: 5058075 (1991-10-01), Mizuta

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