Patent ID: 8035441

Claim:
A high voltage generator of a semiconductor memory device, the high voltage generator comprising: a detection unit configured to compare a reference voltage with an input voltage and to output a comparison result; a first operation mode selection unit configured to generate a first control signal in response to the comparison result of the detection unit during a first data operation mode; a second operation mode selection unit configured to generate a second control signal in response to the comparison result of the detection unit during a second data operation mode; an oscillator configured to generate clock signals having different respective frequencies in response to the first control signal and the second control signal; and a pumping unit configured to perform a charge pumping operation in response to the clock signals, wherein the first and second data operation modes are respectively set according to a first number of data bits and a second number of data bits transferred during each data access operation of the semiconductor memory device, and the first number of data bits and the second number of data bits are each greater than zero.