PUMPING CIRCUIT OF SEMICONDUCTOR MEMORY DEVICE

摘要

PURPOSE: The pumping circuit of a semiconductor device is provided to prevent internal voltage from being overpumped by using the pulse width of an oscillator to reduce the variation of internal voltage. CONSTITUTION: In the device, a first comparator(11) compares the level of inner voltage supplied to an inner circuit of a memory device with the first predetermined voltage. An oscillator(12) outputs a signal corresponding to the result signal from the first comparator(11). A second comparator(13) enabled by the output signal of the first comparator(11) compares the result signal of the first comparator(11) with a second comparator(13). A driving part(14) is operated by the logic of the oscillator pulse signal and the second comparator signal and outputs signal to pump external voltage(VDD).