Patent ID: 7256620

Claim:
A selector circuit comprising: a selector circuit unit for selecting one of a plurality of signals in accordance with a selection signal; and a selection control circuit, connected to the selector circuit unit, for generating, when levels of the plurality of signals do not match one another, an internal selection control signal for controlling a selection operation of the selector circuit unit to maintain a state that is being selected in the selector circuit unit and not to perform a switching operation based on the selection signal until the levels of the plurality of signals match one another, wherein the selection control circuit propagates the selection signal and generates an internal selection control signal having a level corresponding to the selection signal when the levels of the plurality of signals match one another, and interrupts propagation of the selection signal and maintains the level of the internal selection control signal to be provided to the selector circuit unit until the levels of the plurality of signals match one another when the levels of the plurality of signals do not match one another.