Question

An asynchronous binary up counter, made from a series of leading edge-triggered flip-flops, can be changed to a down counter by ________

(a) Taking the output on the other side of the flip-flops (instead of Q)

(b) Clocking of each succeeding flip-flop from the other side (instead of Q)

(c) Changing the flip-flops to trailing edge triggering

(d) All of the Mentioned

This question was posed to me in an interview for job.

I'm obligated to ask this question of Up Down Counter topic in portion Counters of Digital Circuits

Answer 1

Correct choice is (d) All of the Mentioned

The best explanation: By all of the mentioned ideas, an asynchronous binary up counter, made from a series of leading edge-triggered flip-flops, can be changed to a down counter. Edge-triggered FFs refer to FFs being triggered during a clock transition from LOW to HIGH or HIGH to LOW.