Calculator with constant memory

Details Calculator with constant memory Calculator with constant memory

1981-04-08

1982-11-30

Malzahn, David H.

Boots, shoes, and leggings

364900, G06F 100

Patent

active

043618731

ABSTRACT:
A calculator having constant memory utilizing a classical CMOS metal gate process, a low power microcomputer with on-chip and external constant memory capability. Incorporation of a switched negative voltage and a non-switched negative voltage to the appropriate P (-) wells enables the power hungry clocked logic to be turned off while power is maintained on the internal static RAM, on the digit latches, and on the R-lines which connect to both the internal and external RAM. Thus, semi-non-volatile memory (constant memory) capability may be achieved with a low standby current.

REFERENCES:
patent: 3641328 (1972-02-01), Osborne
patent: 3736569 (1973-05-01), Bovricius et al.
patent: 3855577 (1974-12-01), Vandiererdonck
patent: 3928960 (1975-12-01), Reese
patent: 4157588 (1979-06-01), Ebihara et al.

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