Q. Draw a circuit diagram for 3-bit asynchronous binary down counter using master-slave JK flip-flops. Show the output of each flip-flop with reference to the clock & justify that the down counting action. Also prove from the timing diagram that the counters is "divide by 8" counter.

Some counters count upwards from zero. So they can be called as up counters. But the counters which can count in the downward direction i.e. from the maximum count to zero are called down counters.

The countdown sequence for a 3-bit asynchronous down counter is as follows:

Thus counting takes …