Patent ID: 8270234

Claim:
A level shifter, comprising: a level shifter module configured to i) receive an input signal, wherein the input signal varies between a first level and a second level, ii) receive a first voltage supply signal and a second voltage supply signal, and iii) generate a latch control signal based on the input signal and one of the first voltage supply signal and the second voltage supply signal, wherein when the input signal is at the first level, the latch control signal is based on the input signal and the first voltage supply signal, and when the input signal is at the second level, the latch control signal is based on the input signal and the second voltage supply signal; and a latch module configured to i) receive the latch control signal, ii) receive the second voltage supply signal and a third voltage supply signal, and iii) generate an output signal based on the latch control signal and one of the second voltage supply signal and the third voltage supply signal, wherein in a first mode, the second voltage supply signal has a first voltage and the third voltage supply signal has a second voltage, and in a second mode, the second voltage supply signal has a third voltage and the third voltage supply signal has a fourth voltage, wherein the second voltage is greater than the first voltage, and the fourth voltage is greater than the third voltage.