Patent ID: 7345525

Claim:
A voltage pumping device comprising: a voltage level detector for detecting a level of a voltage fed back thereto and generating a voltage pumping enable signal according to the detected voltage level; an oscillator for operating in response to the voltage pumping enable signal and a clock enable signal and generating a desired pulse signal in a normal operation mode, the oscillator including a first logic unit for performing a logic operation with respect to a buffered signal of the clock enable signal and the voltage pumping enable signal and an inverter chain operating in response to an output signal from the first logic unit; a clock supply controller for receiving an external clock signal, operating in response to the voltage pumping enable signal and the clock enable signal and outputting the external clock signal in a low-power operation mode; and a voltage pump for performing a voltage pumping operation in response to the pulse signal from the oscillator in the normal operation mode and performing the voltage pumping operation in response to the clock signal from the external clock supply controller in the low-power operation mode, wherein the oscillator is configured to operate in response to a desired clock enable signal which makes a level transition depending on whether a semiconductor device is in the normal operation mode or low-power operation mode.