Patent ID: 8779803

Claim:
A data output driver, comprising: a pull-up output pre-driver configured to output a plurality of pull-up signals, wherein whether each of the plurality of pull-up signals is enabled is determined in accordance with a driver mode signal, wherein the driver mode signal is determined in accordance with a driving voltage of a memory chip which is allocated to the data output driver; a pull-down output pre-driver configured to output a plurality of pull-down signals, wherein whether each of the plurality of pull-down signals is enabled is determined in accordance with the driver mode signal; and an output driver circuit configured to output data, wherein a driver strength of the output driver circuit is determined in accordance with the pull-up signals and pull-down signals, wherein the driver mode signal comprises first to fourth driver mode signals for selecting first to fourth driver modes as to a number of memory chips which are allocated to the data output driver for the first driving voltage and fifth to eighth driver mode signals for selecting the first to fourth driver modes as to the number of memory chips which are allocated to the data output driver for the second driving voltage.