As mentioned earlier, when the output of the sequential circuit depends only on the present state of the flip-flop, the sequential circuit is referred to as Moore Circuit. Let us see one example of Moore circuits. Fig. 3.37 shows a sequential circuit which consists of two JK flip-flops and AND gate. The circuit has one input X and one output Y.
As shown in the Fig. 3.38, input is used to determine the inputs of the flip-flops. It is not used to determine the output. The output is derived using only present states of the flip-flops or combination of it (in this case Y=QAQB).
In general form the Moore circuit can `be represented with its block schematic as shown in Fig. 3.38 (a) and (b).
In the Moore circuit, as output depends only on present state of flip-flops, it appears only after the clock pulse is applied, i.e. it varies in synchronism with the clock input.