Patent ID: 7622954

Claim:
A circuit for transferring data between two supply voltage domains, the circuit comprising: an input terminal configured to receive an input signal corresponding to the data from a first system operating according to a first supply voltage; an output terminal configured to provide an output signal corresponding to the data based on the input signal to a second system operating according to a second supply voltage; a first circuit powered by the second supply voltage, and configured to receive the input signal and generate the output signal according to the input signal; a second circuit powered by the first supply voltage and configured to receive the input signal and control at least a first section of the first circuit according to the input signal; and a reset circuit coupled to the output terminal and configured to receive a reset signal, wherein the reset circuit is operable to reset the output signal of the circuit when the reset signal is asserted; wherein the first circuit is operable to hold the output signal in a constant state as the first supply voltage is powered off from a nominal value to a low-power value.