# Binary Counter Sequential Circuit

Here, we will study Binary Counter Sequential Circuit with the help of a set of questions and answers. We hope that students who are interested to learn digital electronics and preparing for exams like GATE will find this post useful.

## Binary Counter Sequential Circuit

Here are the questions on the Binary counter sequential circuit with their answers.

### What is an asynchronous binary counter?

In a binary counter, if flip-flops do not change states in exact synchronism with the applied clock pulses then the counter is called an asynchronous binary counter. In this counter, each FF output drives the CLK input of the next FF.

### What is a mod-5 counter?

The mod-5 counter is a binary counter in which the mod number is equal to the number of states that the counter goes through in each complete cycle before it recycles back to its starting state.

### How many states will be there in a mod-5 counter?

There will be five states in a mod-5 counter. That means the counter goes through the counting sequence from 000 to 100 in each complete cycle before it recycles back to its starting state.

### What is a glitch in the asynchronous binary counter?

A glitch is an unwanted spike of the voltage appearing at the output waveform of the mod-N asynchronous counter where N<2 n, Here n=number of flip-flops required to design the counter.

### How do you make an asynchronous counter?

An asynchronous counter can be made by cascading the flip-flops in toggle mode. The clock pulses are applied only to the CLK input of the first flip-flop and then each FF output drives the CLK input of the next FF.

### Define the MOD number of any counter.

The MOD number of any counter is generally equal to the number of states that the counter goes through in each complete cycle before it recycles back to its starting state.

### How can the mod number of a counter be increased?

The MOD number of a counter can be increased simply by adding more FFs to the counter. To construct any MOD-N counter, we may use the equation below to find the number of flip-flops (n) required for counter design.

2n-1 <= N <=2n

### An asynchronous counter is often referred to as a ripple counter – Why?

An asynchronous counter is often referred to as a ripple counter because of the way the FFs respond one after another in a kind of rippling effect.

### A MOD-8 counter is known as a divide-by-8 counter – Why?

In a MOD-8 counter, the signal output from the last FF (i.e., the MSB) will have a frequency of 1/8 the input clock frequency; so it is known as a divide-by-8 counter.

### A MOD-N counter is known as a divide-by-N counter – Why?

In any MOD-N counter, the signal at the output of the last FF (i.e., the MSB) will have a frequency equal to the input clock frequency divided by the MOD – number of the counter. For example, in a MOD-16 counter, the output from the last FF will have a frequency of 1/16 of the input clock frequency. Thus, it can also be called a divide-by-16 counter.

## Related posts (for further study) on Binary Counter

Asynchronous Counter – study & revision notes

Synchronous Counter – Study & Revision Notes

How to design a Synchronous counter – step by step guide

2-bit Synchronous Binary Counter using J-K flip-flops

A 3-Bit Asynchronous Binary Counter – Up Counter

Asynchronous Up counter for Positive & Negative edge-triggered flip-flops

Binary Counter Sequential Circuit – FAQs

Frequently Asked Questions on Flip-Flops Sequential Circuit

Numerical problems on asynchronous counter & synchronous counter

J-K flip-flop – Frequently asked questions for semester & GATE exam

Modulus-M (MOD-M) asynchronous counter – Study and revision notes

Digital Electronics – Hub page

Author of this post

This post is co-authored by Professor Saraswati Saha, who is an assistant professor at RCCIIT, a renowned degree engineering college in India. Professor Saha teaches subjects related to digital electronics & microprocessors.

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