# Binary Up Counter Circuit with working animation and simulation video

Here we are going to discuss about an Asynchronous 4 Bit Binary Up Counter, a circuit made up of several J-K flip-flops cascaded to generate four bits counting sequence. An up counter is basically a digital counting circuit which counts up in an incremental mode. Here we have given the simple counting circuit setup using 4 flip flops and a simulation video for better understanding.

## Components Required For Counter Circuit Design

1. Power supply
2. 7473 JK flip flop IC x 2
3. Resistors (1kΩ x 4)
4. LEDs x 4
5. 1Hz clock of 1Hz Astable multivibrator

## Working Digital Logic Counter

• In this digital counter circuit set up, all flip flops are clocked by the Q outputs of previous flip flops. Thus it is called as an asynchronous counter.
• All the JK flip flops holds their J and K inputs at logic ‘1’. 7473 IC is a dual JK master slave flips flop with a clear pin.
• A ripple counter comprising of N flip flops can be used to count up to 2N pulses. That is, a circuit with 4 flip flops gives a maximum count 24=16.
• This counter gives a natural binary count from 0 to 15 and resets to initial condition on the 16th input pulse.
• Since J and K inputs of all the flip flops are connected to logic ‘1’, they act as a toggle flip flop.
• Here the output of each flip flop toggles at the negative transition of clock input.
• With the application of 1st clock pulse, Q0 changes from 0 to 1, whereas Q1, Q2 and Q2 remains unaffected.
• On 2nd clock pulse Q0 becomes 0 and Q1 becomes 1. This process occurs for other flip flops also.
• If we are taking output from Q’, we will get a down counter simultaneously.

## Counter Circuit Design Truth Table

0 to 15 binary counting sequence of Up Counter is shown below

## Output wave form of Up Counter

Status of each output in the counter is plotted on CRO Screen as