Patent ID: 7224197

Claim:
A flip-flop implemented with metal-oxide semiconductors using a single low-voltage power supply, comprising: a power switch, with both ends separately connected to a power supply and a virtual power supply, and being controlled by an external control signal; a combinational circuit, composed of multiple transistors, with one end connected to said virtual power supply and another end grounded, and with the active mode and the sleep mode thereof being controlled by said power switch; a master stage of said flip-flop, composed of multiple low-threshold transistors, with a power source thereof directly connected to said power supply; and a slave stage of said flip-flop, composed of a latch and two P-C 2 MOS's, with the power source thereof being directly connected to said power supply, and inputting an internal clock signal separately to said master stage and said slave stage of said flip-flop.