<p>An external power source voltage is received from outside a semiconductor chip via external power source terminals. The external power source voltage is dropped through voltage-dropping circuitry provided in the chip and the dropped voltage is supplied as an internal power source voltage to the chip. A number of voltage dropping circuits are provided for several . semiconductor circuit blocks in the chip respectively, in order to suppress the voltage change of the internal power source in operation circuits requiring large currents. @(25pp Dwg.No.3/19)@.</p>
