Power supply detecting input receiver circuit and method

Details Power supply detecting input receiver circuit and method Power supply detecting input receiver circuit and method

2005-11-29

2005-11-29

Zweizig, Jeffrey (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Converging with plural inputs and single output

C327S534000

Reexamination Certificate

active

06970032

ABSTRACT:
A power supply detecting input receiver circuit (300) can include a multiplexing capability that can select one of at least two power supplies during a non-critical timing period. Such selection of a power supply can reduce both the standby and the active current of input receiver circuit (300). In one arrangement, an input receiver circuit (300) can include a comparator (310), a latch (316), and a select circuit (304). A latch (316) can be enabled to indicate a selection of a supply upon a circuit power-up, as but one example. A method is disclosed that includes comparing at least two supply voltages, setting a latch to indicate a selected supply, and providing the selected supply to an input receiver. The receiver output signal may be voltage-translated to a suitable internal supply level.

REFERENCES:
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patent: 5703415 (1997-12-01), Tanaka
patent: 5886561 (1999-03-01), Eitan et al.
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patent: 6548916 (2003-04-01), Kanazawa et al.
patent: 6600239 (2003-07-01), Winick et al.
patent: 6642750 (2003-11-01), Egan

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