Patent ID: 7423911

Claim:
A semiconductor memory device, comprising: a bit line sense amplifier for sensing and amplifying data applied on a bit line; a first driver for driving a pull-up voltage line of the bit line sense amplifier to a voltage applied on a normal driving voltage terminal; a second driver for driving the normal driving voltage terminal to an overdriving voltage; an overdriving signal generator for generating an overdriving signal defining an overdriving period in response to an active command; a level follower for outputting a changing voltage with respect to the overdriving voltage; a voltage level detector for detecting whether or not the overdriving voltage is higher than a predefined level in response to the output voltage of the level follower; and a selective output unit for selectively outputting the overdriving signal in response to an output signal of the voltage level detector, wherein the second driver is controlled by the output signal of the selective output unit.