Semiconductor integrated circuit

Static information storage and retrieval – Read/write circuit – Bad bit

Reexamination Certificate

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C365S201000, C365S225700

Reexamination Certificate

active

06963511

ABSTRACT:
A shift register is sequentially supplied via a clock pad and a data pad with a clock and data indicating whether or not an electric fuse circuit is cut off. The supply turns on a switch corresponding to an electric fuse circuit to cut off, and connects the electric fuse circuits to cut off to a voltage supply line. Here, by supplying a high voltage to the voltage supply line via a voltage pad, electric current flows through electric fuse circuits to cut off in each chip area, thereby cutting off the electric fuse circuits at the same time. Providing the clock pad, data pad, voltage pad common to the electric fuse circuits in each chip area makes it possible to reduce the size of a scribe area. This allows increase in the number of semiconductor chips producible per semiconductor wafer, resulting in reduced manufacturing cost thereof.

REFERENCES:
patent: 5859801 (1999-01-01), Poechmueller
patent: 6166981 (2000-12-01), Kirihata et al.
patent: 6333878 (2001-12-01), Ooishi
patent: 6469949 (2002-10-01), Hsu et al.
patent: 6804156 (2004-10-01), Ito
patent: 60-182150 (1985-09-01), None

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