Patent ID: 8618871

Claim:
A semiconductor device connected to an internal circuit, comprising: a first terminal for receiving a first signal; a second terminal for receiving a second signal; a first noise reduction circuit; and a second noise reduction circuit, wherein said first noise reduction circuit includes a first Schmitt circuit for receiving the first signal from the first terminal and outputting a first output signal; and an output signal adjusting unit for adjusting and outputting a second output signal to the internal circuit when the first output signal is maintained for a specific period of time after the first output signal is varied, and said second noise reduction circuit includes a second Schmitt circuit for receiving the second signal from the second terminal; and an input signal adjusting unit for adjusting the second signal input to the second Schmitt circuit according to a fluctuation of a power source voltage applied to the semiconductor device so that the second Schmitt circuit outputs a third output signal to the internal circuit.