A
semiconductor device includes a sense-
amplifier driving device. The sense-
amplifier driving device includes a sense-
amplifier driver configured to provide a first pull-up
voltage and a first pull-down
voltage to a pull-up power line and a pull-down power line, respectively, during a first over-driving time period, provide the second pull-up
voltage and the first pull-down voltage to the pull-up power line and the pull-down power line, respectively, during an
active time period, and provide a third pull-up voltage and a second pull-down voltage to the pull-up power line and the pull-down power line, respectively, during a second over-driving time period, and a drive-
signal generator configured to generate a plurality of drive signals, which is selectively activated during the first over-driving time period, the
active time period, and the second over-driving time period, to control an operation of the sense-amplifier driver.