Semiconductor integrated circuit device

Details Semiconductor integrated circuit device Semiconductor integrated circuit device

2005-08-24

2008-12-02

Nguyen, Dang T (Department: 2824)

Static information storage and retrieval

Read/write circuit

Minor loop

C365S189090, C365S185110

Reexamination Certificate

active

07460427

ABSTRACT:
A semiconductor memory device includes: an ID code memory circuit configured to store ID code data bits in a non-volatile manner; an ID code generating circuit configured to generate an ID code based on the data bits stored in the ID code memory circuit and output it to an external terminal; a power supply voltage detecting circuit configured to detect a power supply voltage supplied from the external and supply a select signal to at least one of the ID code memory circuit and ID code generating circuit for selectively generating one of ID codes, data bits of which are different from each other at least in part in correspondence with power supply voltage levels.

REFERENCES:
patent: 5889721 (1999-03-01), Gannage
patent: 6870786 (2005-03-01), Kanda et al.
patent: 2002/0114184 (2002-08-01), Gongwer et al.
patent: 2003/0035328 (2003-02-01), Hamamatsu et al.
patent: 11-39866 (1999-02-01), None

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