Clock signal generator capable of generating stable clock signal, semiconductor memory device having the same, and method thereof

摘要

A clock signal generator can include a clock signal generation unit (18) that is configured to generate a clock signal (CLK). A clock signal control unit (20) is configured to count a number of pulses of the clock signal during a reference time, and to compare the number of pulses with a reference value to provide a comparison result, and to generate a control signal (CR) based on the comparison result, where the clock signal generation unit increases or decreases the number of pulses of the clock signal based on the control signal.