Semiconductor device

The disclosed invention provides a semiconductor device capable of suitably controlling the level of an enable signal to resolve NBTI in a PMOS transistor. An input node receives an input signal alternating between high and low levels during normal operation and fixed to a high level during standby. A detection unit receives a signal through the input node and outputs an enable signal. The detection unit sets the enable signal to a low level upon detecting that the input node remains at a high level for a predetermined period. A signal transmission unit includes a P-channel MOS transistor and transmits a signal input to the input node according to control by the enable signal.