Semiconductor device, method for controlling the same, and data processing system including semiconductor device

摘要

A semiconductor device includes a multiplexer and an output buffer. The multiplexer includes: n switches (n is an integer of 2 or greater) each including an input node receiving a different data signal and an output node coupled to an input node of the output buffer; and a plurality of switch control circuits each corresponding to a respective one of the n switches. Each of the plurality of switch control circuits turns on a corresponding one of the n switches based on a corresponding one of the signals each having a first cycle and a phase different by 1/n of the cycle from adjacent phases. When each of the plurality of switch control circuits detects that an input-side data signal of the corresponding one of the n switches appears at a corresponding output-side node, each of the plurality of switch control circuits turns off the corresponding switch. The multiplexer converts data, which is inputted in parallel to the n switches and which changes in the first cycle, into serial data that changes in 1/n of the first cycle and outputs the serial data via the output buffer.