Erasable and programmable ROM with an identification code

Details Erasable and programmable ROM with an identification code Erasable and programmable ROM with an identification code

1991-09-19

1994-06-28

Clawson, Jr., Joseph E.

Static information storage and retrieval

Read only systems

Semiconductive

365 96, 36518903, 36523005, 36523006, 3652257, G11C 1708

Patent

active

053253230

ABSTRACT:
An erasable and programmable ROM with an identification code includes an internal circuit operating as an EPROM, a code reading circuit having a code setting circuit for storing a predetermined identification code, an output circuit, and a switching circuit for transferring an output of an internal circuit to the output circuit. The switching circuit is turned on to transfer the output signal of the internal circuit to the output circuit directly, when information in the internal circuit is read out. On the other hand, the switching circuit is turned off to separate the output circuit from the internal circuit, when the identification code is read out from the code setting circuit.

REFERENCES:
patent: 4998223 (1991-03-01), Akaogi
patent: 5111431 (1992-05-01), Garde
patent: 5126968 (1992-06-01), Hamamoto et al.

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