Electronic digital logic circuitry – Multifunctional or programmable
Reexamination Certificate
2005-09-27
2005-09-27
Tokar, Michael (Department: 2819)
Electronic digital logic circuitry
Multifunctional or programmable
C326S038000, C326S039000, C326S113000, C327S407000, C327S408000
Reexamination Certificate
active
06949951
ABSTRACT:
A multiplexer that can be used, for example, in a programmable logic device (PLD). The multiplexer includes a plurality of pass transistors passing a selected one of several input values to an internal node, which drives a buffer that provides the multiplexer output signal. The pass transistors can be controlled, for example, by values stored in memory cells of a PLD. The pass transistors have a first oxide thickness and are controlled by a value having a first operating voltage. The buffer includes transistors having a second and thinner oxide thickness, and is operated at a second and lower operating voltage. Where memory cells are used to control the pass transistors, the memory cells include transistors having the first oxide thickness and operate at the first operating voltage. Some embodiments also include transistors of varying gate length for each of the pass transistors, buffer transistors, and memory cell transistors.
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Hart Michael J.
Kondapalli Venu M.
Voogel Martin L.
Young Steven P.
Cartier Lois D.
Nguyen Khai
Tokar Michael
Xilinx , Inc.
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