A data output circuit includes a pre-code generation unit configured to generate one of a pre-pull-up code and a pre-pull-down code according to a calibration code in response to a voltage level of input data; and a plurality of main driving units configured to be selectively activated in response to an on-die termination code, wherein respective outputs of the plurality of main driving units are commonly connected to an output node, and wherein activated main driving units drive the output node in response to the pre-pull-up code or the pre-pull-down code.