Patent ID: 7151392

Claim:
An output driver circuit for outputting internal data of a memory device to the outside of the memory device, comprising: a pre-driver for generating a plurality of data signals, based on the internal data; an off-chip driver (OCD) pre-driver for receiving first and second ones of the data signals from the pre-driver and predetermined control signals from a control unit included in the memory device, thereby generating a plurality of up-driving control signals for control of up-driving impedance and a plurality of down-driving control signals for control of down-driving impedance; a push-pull driver for receiving third and fourth ones of the data signals from the pre-driver and the up-driving and down-driving control signals from the OCD pre-driver, thereby generating an output signal; and a slew rate control unit for controlling the internal data inputted the pre-driver to adjust a slew rate of the output signal.