Level shifters and level shifting methods for suppressing current flow and generating fixed output values

摘要

A level shifter includes a level shifting circuit which receives input signal from a function block and changes the voltage level of the input signal, to output an output signal; a current blocking circuit, which suppresses current flowing to the level shifting circuit in an input suppression mode in which power supplied to the function block is cut and deactivates the level shifting circuit; and an output control circuit, which controls the output signal of the level shifting circuit to have a direct current (DC) voltage level in the input suppression mode.