A circuit includes a PMOS transistor, an NMOS transistor, and a logic level generation section comprising an input and a logic level output. The PMOS gate receives an input voltage having a voltage level determined based on an operational voltage, the PMOS drain is coupled to the NMOS drain and the input of the logic level generation section, and the PMOS source is coupled to the operational voltage. The NMOS gate receives a voltage that causes the NMOS transistor to have a first driving capability. The first driving capability of the NMOS transistor is less than that of the PMOS transistor if the input voltage has a voltage level greater than a predetermined voltage level.