Question

A modulus 10 counter must have
1. 10 flip flops
2. 4 flip flops
3. 2 flip flops
4. synchronous clocking

Answer 1

Correct Answer - Option 2 : 4 flip flops

Concept:

For a counter with ‘n’ flip flops:

• The total number of states = 2n (0 to 2n – 1)
• The largest number that can be stored in the counter = 2n – 1

 

To construct a counter with any MOD number, the minimum number flip flops required must satisfy:

Modulus ≤ 2n

Where n is the number of flip-flops.

Calculation:

Number no. of flip–flops are required to construct a mod-10 counter, must satisfy:

2n ≥ 10 i.e.

n = 4