Patent ID: 7145813

Claim:
A semiconductor device comprising: a first detection circuit which detects a leading edge of a pulse waveform of an input signal; a second detection circuit which detects a trailing edge of the pulse waveform of the input signal; a determination circuit which determines whether a pulse width of the pulse waveform is shorter than a given period, based on detection results of the first detection circuit and the second detection circuit; a pulse generation circuit which generates a pulse signal when the determination circuit determines that the pulse width of the pulse waveform is shorter than the given period; a hold circuit which is set in one of a hold state and a conductive state in response to the pulse signal generated from the pulse generation circuit; a sense amplifier which reads a signal out of a memory cell and supplies the signal to the hold circuit; and an output buffer circuit which receives a signal from the hold circuit and supplies the signal to an outside.