Patent ID: 8497725

Claim:
A circuit comprising: a first circuit portion coupled to receive, on a first power supply terminal, a first power supply voltage for operation, wherein the first circuit portion is coupled to receive a first input signal, and to generate a first output signal on a first output node, the first circuit portion also coupled to receive a control signal on a control terminal, wherein the first circuit portion is designed to respond to changes in magnitude of the first input signal only if a logic value of the control signal has a first value; a second circuit portion coupled to receive, on a second power supply terminal, a second power supply voltage, wherein the second circuit portion is coupled to receive the first output signal as an input, and to generate a second output signal, wherein the first power supply is switched ON a first time interval later than when the second power supply is switched ON; and an active circuit coupled between the control terminal and a first constant reference potential node of the circuit, wherein the active circuit is designed to provide a conduction path between the control terminal and the first constant reference potential node in the first time interval, and to be an open circuit otherwise.