Random access memory device having parallel non-volatile memory

Details Random access memory device having parallel non-volatile memory Random access memory device having parallel non-volatile memory

1990-10-18

1991-07-02

Psitos, Aristotelis M.

Static information storage and retrieval

Floating gate

Particular biasing

365154, G11C 1134

Patent

active

050291327

ABSTRACT:
A non-volatile random access memory device comprising a plurality of memory cells, each of the memory cells comprising, a volatile memory cell and a pair of non-volatile memory cells connected to the volatile memory cell for storing data from the volatile memory cell and for recalling the stored data to the volatile memory cell, each of the pair of non-volatile memory cells comprising a first transistor having a floating gate, a tunnel capacitor having one electrode connected to the floating gate, a write circuit operatively connected to both electrodes of the tunnel capacitor, the polarities of potentials applied to both electrodes of the tunnal capacitor being changed in accordance with the data from the volatile memory cell so that electrons are injected to the floating gate or emitted from the floating gate through the tunnel capacitor and the potential at the floating gate is controlled in accordance with the data from the volatile memory cell, and a recall circuit for recalling the data from the corresponding non-volatile memory cell to the volatile memory cell in accordance with the potential at the floating gate.

REFERENCES:
patent: 4630238 (1986-12-01), Arakawa
patent: 4660179 (1987-04-01), Aoyama
patent: 4703456 (1987-10-01), Arakawa
patent: 4799194 (1989-01-01), Arakawa
patent: 4800533 (1989-01-01), Arakawa

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