Patent ID: 7498855

Claim:
A semiconductor integrated circuit comprising: a voltage regulator that outputs an external power-supply voltage and an internal power-supply voltage lower than the external power-supply voltage; and a power-ON-clear circuit comprising, an inverter with a power-supply terminal connected to the internal power-supply voltage and an input terminal receiving the external power-supply voltage, said inverter outputting a reset signal each time immediately after said external power-supply voltage is interrupted and restored, and a MOS transistor and a capacitor that are connected in series between said external power-supply voltage and a ground potential, a connecting point between said MOS transistor and said capacitor being connected to said input terminal of said inverter, said MOS transistor having terminals connected to said external power-supply voltage and the ground potential and is turned ON when said external power-supply voltage is supplied, and said capacitor having a terminal connected to one of the external power-supply voltage and the ground potential and is charged by said external power-supply voltage when said external power-supply voltage is supplied.