Electronic digital logic circuitry – Multifunctional or programmable – Having details of setting or programming of interconnections...
Patent
1997-06-20
1999-08-31
Tokar, Michael
Electronic digital logic circuitry
Multifunctional or programmable
Having details of setting or programming of interconnections...
326 10, 327525, 36523001, H03K 19003, H03K 19173
Patent
active
059458402
ABSTRACT:
An inventive programmable circuit stores a bit (i.e., a "1"or a "0") as the result of one of a pair of anti-fuses of the circuit connected in series between a supply voltage V.sub.cc and ground V.sub.ss being blown. If the anti-fuse connected to the supply voltage V.sub.cc is blown, the supply voltage V.sub.cc passes through the anti-fuse to a node between the series-connected anti-fuses. If, instead, the anti-fuse connected to ground V.sub.ss is blown, the node between the anti-fuses is connected to ground through the blown anti-fuse. The voltage on the node (i.e., V.sub.cc or V.sub.ss) may then be output from the programmable circuit as being representative of the bit stored in the circuit. Because only one of the anti-fuses is blown, no direct path exists between the supply voltage V.sub.cc and ground V.sub.ss, so the programmable circuit does not waste current as prior circuits are known to do. The programmable circuit is particularly useful in storing the memory addresses of memory cells in a memory device that are to be replaced by redundant cells.
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Cowles Timothy B.
Renfro Steven G.
Micro)n Technology, Inc.
Roseen Richard
Tokar Michael
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