Patent ID: 6836177
Filing Date: 2004-12-28
Classification: G05F

Abstract:
A step-up circuit, comprising:a step-up clock signal generation device that generates a clock signal to be used for voltage step-up; a plurality of step-up stages for successively stepping up a power supply voltage based on the clock signal; and a control device that controls, after starting an operation, the clock signal generated by the step-up clock signal generation device to be supplied to the plurality of step-up stages at different times, wherein the step-up clock signal generation device generates a clock signal to be used for voltage step-up based on a clock signal applied, and wherein the control device includes: a counter that counts the clock signal applied to the step-up clock signal generation circuit, and a plurality of output control circuits that respectively supply, based on different output values of the counter, the clock signal generated by the step-up clock signal generation circuit to the plurality of step-up stages.