| 摘要 |
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.
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