Abstract: The invention realizes a serial to parallel conversion circuit which operates at a high speed with low power dissipation. High speed serial data are input and re-timed with a high speed clock input by a first high speed flip-flop. Differential divide-by-eight clock signals are produced by dividing the high speed differential clock input by two using a second high speed flip-flop and are supplied to ninth through eleventh flip-flops, by which divide-by-eight shift clock signals and another series of divide-by-eight shift clocks leading the divide-by-two clocks by a half-period are produced. The output of the first high speed flip-flop is input to a shift register comprising first through fourth flip-flops, and is shifted with the positive phase divide-by-two clock signals. The output of the shift register is then re-timed with the other divide-by-eight shift clock signals described above by twelfth through fifteenth flip-flops.

Abstract: A flip-flop circuit which has a low power requirement and is capable of high-speed operation has first and second latch circuits having respective clock input terminals connected respectively to inverted- and normal-phase clock input terminals, a pair of differential data input terminals connected respectively to the differential signal input terminals of the first latch circuit, a pair of differential output terminals connected respectively to the differential signal output terminals of the second latch circuit, and a power supply and a current source, each connected to the first and second latch circuits. Each of the first and second latch circuits has first and second current mirror circuits energizable by the power supply, and first through fifth MOS transistors, each of the first and second latch circuits being of a dynamic type.