Patent ID: 6864693

Claim:
A semiconductor integrated circuit comprising a functional block and a negative voltage generation circuit for generating a predetermined negative voltage to be supplied to the functional block, the negative voltage generation circuit having a charge pump part, which converts a power source voltage into the predetermined negative voltage and outputs it, and a voltage detection part, which controls the output voltage of the charge pump part by comparing the output voltage of the charge pump part with a reference voltage and outputting the result of comparison to the charge pump part, wherein ground voltage is used as the reference voltage, and the charge pump part comprises a self-oscillating circuit, which generates a predetermined pulse signal only during a period in which an output signal from the voltage detection part is in an activated state, and a timing signal generation circuit, which converts the output pulse signal from the self-oscillating circuit into a timing signal, and wherein the voltage detection part comprises a constant voltage generation circuit, a measuring voltage generation circuit, which receives an output voltage from the constant voltage generation circuit and an output voltage from the charge pump part and generates a divided measuring voltage by resistive means, a first comparator for outputting the result of comparison after comparing the measuring voltage from the measuring voltage generation circuit with the ground voltage, and an output buffer circuit for amplifying the compared result from the first comparator and outputting it to the charge pump part.