PURPOSE: To adjust ATD characteristics over a wide range of power-supply voltage and to prevent that an operating characteristic on the side of low voltage is deteriorated by a method wherein the delay or the pulse width of an ATD circuit is changed over according to whether the power-supply voltage is high or low.

CONSTITUTION: When the output D of a power-supply voltage detection circuit 1 is at a low potential 'L', an N-channel transistor T1 is turned off and a capacity element C3 is not connected. As a result, the delay time A1 from an inverter circuit I1 up to an inverter circuit I4 is small. When the output D is at a high potential 'H', the transistor T1 is turned on. The capacity element C3 is set to a connection state, and the delay time A1 from the inverter circuit I1 up to the inverter circuit I4 becomes large. Consequently, the pulse width of the output P of an address-change detection circuit 2 can be changed by the output D of the power-supply voltage detection circuit 1.