Patent ID: 7675345

Claim:
A low-leakage, level-shifter circuit comprising: a first power supply providing a first voltage relative to a ground potential; a second power supply providing a second voltage relative to the ground potential; level-shifter circuitry having an input receiving logic state signals based on the first supply voltage and having an output supplying corresponding logic state signals based on the second supply voltage, the level-shifter circuitry including a first transistor and a second transistor coupled between the second voltage and ground and coupled between the input and the output; a supply detector coupled to the first power supply to provide a detection signal based on the first voltage; a leakage reducer, coupled between the first and second transistors and the output and, based on the detection signal, setting the logic state of the output to a predetermined state; and a disabler, coupled between the first and second transistors and the ground potential and, based on the detection signal, pulling all terminals of the first and second transistors to the ground potential.