Device for the protection of stored data

Details Device for the protection of stored data Device for the protection of stored data

1997-08-21

1998-07-28

Le, Vu A.

Static information storage and retrieval

Read/write circuit

365195, 711163, G11C 700

Patent

active

057870403

ABSTRACT:
A device for protection of data stored in a memory includes a supply voltage drop detection device to set an enabling signal in an active state when a supply voltage is below a threshold and a flip-flop circuit whose output controls the state of the enabling signal concurrently with the supply voltage drop detection device so that all programming is prohibited when the flip-flop circuit stores a first state, and the protection device is organized in such a way that this state of the flip-flop circuit is modified only after the supply voltage drop detection circuit has detected that the supply voltage is below the threshold.

REFERENCES:
patent: 4485456 (1984-11-01), Toyoda
patent: 4580246 (1986-04-01), Sibigtroth
patent: 5315549 (1994-05-01), Scherpenberg et al.
patent: 5430882 (1995-07-01), Tilghman et al.
patent: 5557576 (1996-09-01), Roohparvar et al.
patent: 5668760 (1997-09-01), Hazen

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