Data selector circuit including a plurality of data registers connected in parallel via corresponding output buffers to a plurality of output drivers, wherein a decoder and selector portion is interposed between the output buffers and the output drivers for selectively providing one of a plurality of serial data output sequences from the data registers to the output drivers rather than a parallel data output format from the plurality of data registers which would otherwise occur. The decoder and selector portion is controlled by a partial address buffer which is provided with serial sequence selection data. Upon decoding the serial sequence selection data of the partial address buffer, a plurality of MOS transistors included in the selector portion are rendered conductive in sequence in response to respective control signals applied to the gates thereof to connect the plurality of data registers via their output buffers to respective output drivers in a sequence determined by the decoded selection data of the partial address buffer for serial data output in the selected serial data output sequence.