PURPOSE: To reduce the number of the external terminals of a semiconductor integrated circuit by using the control terminal of a pulse generating circuit generating an one-shot pulse and the terminal of a power supply in common.

CONSTITUTION: When a voltage is linearly raised over a definite time or more at the time of the application of voltage to the terminal 1 of a power supply, the first pulse having the rising time of the voltage of the power supply and the falling time determined by the threshold voltage of the first inverter 8 and the time constant of a resistor 3 and the first condenser 5 is outputted to the inverter 8. A third output pulse having a falling time not relying in the rising time of the voltage of the power supply but determined by the threshold voltage of the inverter constituting a constant current source 4, the second condenser 7 and a buffer 10 is outputted from the buffer 10. By holding data to a D-FF 12 on the basis of the OR of the first and third output pulses, a usual use mode and an inspection mode are mutually changed over.