Low latency, power-down safe level shifter

Details Low latency, power-down safe level shifter Low latency, power-down safe level shifter

2011-03-29

2011-03-29

Barnie, Rexford N (Department: 2819)

Electronic digital logic circuitry

Interface

Logic level shifting

Reexamination Certificate

active

07915920

ABSTRACT:
In one embodiment, an apparatus comprises a circuit supplied by a first supply voltage during use, the circuit having at least a first input signal; and a level shifter supplied by the first supply voltage during use and coupled to provide the first input signal to the circuit. The level shifter is coupled to receive a second input signal sourced from circuitry supplied by a second supply voltage during use, and is configured to generate the first input signal by level shifting the second input signal. Coupled to receive a power control signal indicating, when asserted, that the second supply voltage is to be powered down, the level shifter is configured to assert a predetermined level on the first input signal independent of the second input signal and responsive to an assertion of the power control signal.

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