Non-volatile random access memory device

Details Non-volatile random access memory device Non-volatile random access memory device

1990-11-05

1993-02-23

Sniezek, Andrew L.

Static information storage and retrieval

Powering

Data preservation

365190, 365185, G11C 700

Patent

active

051896419

ABSTRACT:
A semiconductor memory device includes a memory cell including a volatile memory cell portion having a flip-flop and a non-volatile memory cell portion individually and respectively associated with the volatile memory cell portion and including a capacitor portion operatively connected to the volatile memory cell portion, a memory transistor operatively connected to the capacitor portion, and a recall transistor connected between the memory transistor and one of a pair of nodes of the flip-flop and selectively turned ON in a recall operation.
The capacitor portion comprises a tunnel capacitor, used in a store operation, connected in series with a further capacitor and to which is applied a difference voltage between the respective voltages appearing at the pair of nodes. The space occupied by the memory cells on a chip is reduced and the degree of integration of the circuit is increased.

REFERENCES:
patent: 4354255 (1982-10-01), Stewart
patent: 4630238 (1986-12-01), Arakawa
patent: 4635229 (1987-01-01), Okumura et al.
patent: 4706220 (1987-11-01), Spence
patent: 4800533 (1989-01-01), Arakawa
patent: 4802124 (1989-01-01), O'Brien, Jr.

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