Patent ID: 7068078

Claim:
A data output driver which increases its output terminal driving strength linearly in proportion to a number of activated N numbers of pull-up control signals and N numbers of pull-down control signals, comprising: a pull-up driving unit, having N numbers of unit pull-up drivers and N numbers of pull-up resistors, turned on by selected pull-up control signals for pull-up driving the output terminal in response to a pull-up data signal wherein the unit pull-up driver includes a first pull-up PMOS transistor turned on by a pull-up control signal to transfer a power supply voltage to the output terminal and a second pull-up PMOS transistor turned on by the pull-up data signal to transfer the power supply voltage to the output terminal; and a pull-down driving unit, having N numbers of unit pull-down drivers and N numbers of pull-down resistors, turned on by selected pull-down control signals for pull-down driving the output terminal in response to a pull-down data signal wherein the unit pull-down driver includes a first pull-down NMOS transistor turned on by a pull-down control signal to transfer a ground voltage to the output terminal and a second pull-down NMOS transistor turned on by the pull-down data signal to transfer the ground voltage to the output terminal, wherein, each of the N numbers of unit pull-up drivers has the same driving strength, and the N numbers of pull-up resistors are connected between the output terminal and the N numbers of unit pull-up drivers; and each of the N numbers of unit pull-down drivers has the same driving strength, and the N numbers of pull-down resistors are connected between the output terminal and the N numbers of unit pull-down drivers.