FLIP FLOP CIRCUIT

A pulse-based flip flop circuit includes; a pulse generator generating a pulse signal and an inverted pulse signal, a scan hold buffer holding a scan input signal for a delay time, and a latch circuit including an intermediate node receiving one of a data signal and the scan input signal in response to a scan enable signal, the pulse signal and the inverted pulse signal. The pulse generator circuit includes; a direct path providing a clock signal as a direct path input to a NAND circuit, a delay path including a number of stages configured to delay the clock signal and provide a delayed clock signal as a delay path input to NAND circuit, wherein the NAND circuit performs a NAND operation on the direct path input and the delay path input to generate the inverted pulse signal, and a feedback path providing the pulse signal to a first stage among the number of stages of the delay path.