CONSTRUCTIONS OF TERNARY FLIP-FLOP CIRCUITS.

Tri-value logic circuits consisting of 3-value fundamental flip-flop circuits employing CMOS IC's considered to be useful in integration are discussed. The authors propose construction methods for tri-value tri-stable flip-flops by using these tri-value fundamental circuits. 3-value RS-FF, 3-value RSS-FF, 3-value RSR-FF, 3-value D-FF, 3-Value T-FF, and 3-value JK-FF are defined as tri-value tri-stable FF's; thus their characteristic equations are found. Input equations are introduced by defining application equations. There are addition, substraction, and addition/subtraction types among tri-value T-FF and tri-value JK-FF whose outputs are fed back to their control gates. The normal operation cannot be ensured if these are not edge-triggered or of 2-stage structures. Therefore, concerning tri-value T-FF and tri-value JK-FF, 2-stage circuit constructions are relayed by use of partially fed back characteristic equations.