Clocked T Flip-flops
Some versions of the T flip-flop operate under clock pulse control, as shown in Fig. 6.35a. In this case, the flip-flop toggles if T = 1 when the clock makes a high-to-low transition and holds its present state if T = 0 when the flip-flop is clocked.
The operation of a clocked T flip-flop is described by the excitation table given in Fig. 6.36.
The equivalent circuit of the clocked T flip-flop, shown in Fig. 6.35b, is simply a JK flip-flop with inputs J = K = T, and its C input driven by the clock signal.
Another variation of the clocked T flip-flop is shown in Fig. 6.37a.