Patent ID: 8018245

Claim:
A semiconductor device comprising: a pull-up slew rate controller configured to receive a first driving control signal generated in a first mode of operation, a second driving control signal generated in a second mode of operation, and data, and upon a first transition of the data, to sequentially activate the data and a first pull-up delayed signal having different delay times in the first mode of operation and to sequentially activate the data and the first pull-up delayed signal, a second pull-up delayed signal and a third pull-up delayed signal, each having different delay times in the second mode of operation; a pull-up driving unit configured to sequentially pull a data output terminal up in response to the data and the first pull-up delayed signal, the second pull-up delayed signal and the third pull-up delayed signal; a pull-down slew rate controller configured to, upon a second transition of the data, sequentially activate the data and a first pull-down delayed signal having different delay times in the first mode of operation and to sequentially activate the data and the first pull-down delayed signal, a second pull-down delayed signal and a third pull-down delayed signal, each having different delay times in the second mode of operation; and a pull-down driving unit configured to sequentially pull the data output terminal down in response to the data and the first pull-down delayed signal, the second pull-down delayed signal and the third pull-down delayed signal.