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CMOS Toggle Flip-Flop Disclosure Number: IPCOM000059728D
Original Publication Date: 1986-Jan-01
Included in the Prior Art Database: 2005-Mar-08

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Downey, JH [+details]


This CMOS (Complementary Metal Oxide Semiconductor) Toggle Flip-Flop (TFF) circuit features fewer field-effect transistor devices to perform the function of toggle control for a master/slave latch. The TFF circuit illustrated consists of three parts: a switching circuit 3 which controls a master latch 1, and a slave latch 2, both latches being positive-edge triggered by the switching circuit. Four devices (3 N-type and 1 P-type) control the input to the TFF, and the circuit operation overview is shown in the state diagram. The TFF operates as follows: .IN 5 1) The clear line (CLR), which is independent of the clock (CLK), is pulsed high, "1". The output goes low, "0". The TFF is now primed for operation.