Static information storage and retrieval – Read/write circuit – Having fuse element
Patent
1999-01-20
2000-10-31
Zarabian, A.
Static information storage and retrieval
Read/write circuit
Having fuse element
365200, G11C 700
Patent
active
061412821
ABSTRACT:
A circuit for designating an operating mode of a packaged semiconductor memory device includes a first fuse mounted on the device. A plurality of pads mounted on the device are accessible to a user after the device is packaged. A mode selection circuit generates a first signal when the first fuse is open and a second signal when the first fuse is closed. A first-fuse opening circuit is operably connected to the pads and opens the first fuse responsive to a predetermined first-fuse cutting signal on the pads. In another aspect of the invention, a second fuse may be opened responsive to a predetermined second-fuse cutting signal on the pads. When the second fuse opens, the first-fuse opening circuit is disabled to prevent accidental opening of the first fuse when the desired operating mode requires the first fuse to be maintained intact.
REFERENCES:
patent: 4987325 (1991-01-01), Seo
patent: 4996672 (1991-02-01), Kim
patent: 5459693 (1995-10-01), Komarek
patent: 5596536 (1997-01-01), Koh
patent: 5633827 (1997-05-01), Numata
patent: 5657280 (1997-08-01), Shin
patent: 5717654 (1998-02-01), Manning
Chin Choong-Sun
Lim Hyung-Kyu
Samsung Electronics Co,. Ltd.
Zarabian A.
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