Low static current drain logic circuit

Details Low static current drain logic circuit Low static current drain logic circuit

2008-09-30

2008-09-30

Tran, Anh Q (Department: 2819)

Electronic digital logic circuitry

Interface

Supply voltage level shifting

C326S068000, C326S080000

Reexamination Certificate

active

11638156

ABSTRACT:
A logic circuit is disclosed that is tolerant of logic signals with voltages different from the voltage of the logic circuit power supply. In one embodiment, the logic circuit has an inverting amplifier therein, the amplifier having at least one input and an output and is powered by the power supply. A first transistor, in responsive to the output of the amplifier, biases the input of the amplifier to assure substantially no static current flows through the amplifier when a logic-low is present on the amplifier output. A second transistor couples at least one logic input of the logic circuit to the input of the amplifier. In one embodiment, the second transistor impedes static current flow from the first transistor, through the second transistor, to the logic input. Various other embodiments of the logic circuit include a latch/flip-flop, multiplexer, and a complex logic gate.

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U.S. Appl. No. 11/012,550, filed Dec. 15, 2004.

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