Security circuit for semiconductor memory and method for protect

Details Security circuit for semiconductor memory and method for protect Security circuit for semiconductor memory and method for protect

1999-04-01

2000-11-28

Elms, Richard

Static information storage and retrieval

Floating gate

Data security

3652257, 365200, 365195, G11C 1604

Patent

active

061543888

ABSTRACT:
A security circuit for a semiconductor memory, is disclosed, which is able to provide excellent security and safety for data stored in the memory, even if a small number of pads are available. The circuit includes a pad connected to a terminal on a memory IC for use as a write enable terminal, a fuse connected between the pad and the internal memory IC for isolating the internal memory IC from the pad after data is written on the memory IC, a low voltage detecting part for detecting a low voltage at a pad terminal, a latching part for forwarding an output of the low voltage detecting part after maintaining or inverting the output, a switching part for supplying power sufficient to the fuse in response to a signal from the latching part, a pull-up part for pulling up a voltage of the memory when the fuse is blown, and a power on reset part for initializing the latching part.

REFERENCES:
patent: 4268911 (1981-05-01), Bell
patent: 4606013 (1986-08-01), Yoshimoto
patent: 5053992 (1991-10-01), Gilberg et al.
patent: 5309394 (1994-05-01), Wuertz et al.

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