Question

In 4-bit up-down counter, how many flip-flops are required?

(a) 2

(b) 3

(c) 4

(d) 5

This question was addressed to me by my school principal while I was bunking the class.

My doubt stems from Up Down Counter topic in division Counters of Digital Circuits

Answer 1

The correct answer is (c) 4

To elaborate: An n-bit bit counter requires n number of FFs. In a 4-bit up-down counter, there are 4 J-K flip-flops required.