A semiconductor device includes a chip select signal flip-flop configured to: latch a chip select signal in-sync with a first propagation clock signal, and output a first chip select enable signal, and latch the chip select signal in-sync with a second propagation clock signal having a phase opposite to a phase of the first propagation clock signal, and output a second chip select enable signal; and a clock control circuit configured to generate the first propagation clock signal and the second propagation clock signal based on a clock signal, and selectively output one of the first propagation clock signal and the second propagation clock signal based on an enable level of the first chip select enable signal and an enable level of the second chip select enable signal.