Static information storage and retrieval – Read/write circuit – Bad bit
Reexamination Certificate
2005-11-08
2005-11-08
Phung, Anh (Department: 2824)
Static information storage and retrieval
Read/write circuit
Bad bit
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
Arent & Fox PLLC
Fujitsu Limited
Phung Anh
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