# 3 Bit Asynchronous Up Counter With Circuit Diagram And Truth Table

Asynchronous counters are an important component of digital electronics and are used in a variety of applications. A 3-bit asynchronous up counter is a basic type of digital circuit that can count from 0 to 7 in binary. This counter takes two inputs, a clock signal (CLK) and a reset signal (RST), and has three binary outputs; QA, QB, and QC. In this article, we will discuss the circuit diagram and truth table of the 3-bit asynchronous up counter and go over some of the wiring diagrams related to this particular circuit.

The 3-bit asynchronous up counter is built using flip-flops and logic gates. Flip-flops are used to store values and count up or down depending on the input signals. Logic gates are used to process the inputs and generate the appropriate output. The 3-bit counter is one of the simplest digital counters and can be used as a building block for larger and more complex circuits.

## Circuit Diagram

The circuit diagram of the 3-bit asynchronous up counter is shown below. It consists of three J-K flip-flops connected in series, along with the reset (RST) and clock (CLK) inputs. The outputs of each flip-flop are fed back into the clock (CLK) input of the next flip-flop.

![circuit diagram](https://i.stack.imgur.com/mjxU6.jpg)

When the CLK input is low, all the flip-flops are reset to their initial states and the outputs are set to zero. When the CLK input is high, the first flip-flop is triggered, which then triggers the second flip-flop, and so on. The output of each flip-flop is used as the input to the next flip-flop. This process continues until all three flip-flops have been triggered and the output of the last flip-flop (QC) is high.

## Truth Table

The truth table of the 3-bit asynchronous up counter is given below:

| RST | CLK | QA | QB | QC |
|:---------:|:---------:|:--------:|:--------:|:--------:|
| 0 | 0 | 0 | 0 | 0 |
| 0 | 1 | 0 | 0 | 1 |
| 0 | X | X | X | Count |
| 1 | 0 | 0 | 0 | 0 |
| 1 | 1 | 0 | 0 | 0 |

As can be seen from the truth table, the 3-bit asynchronous up counter counts up each time the clock (CLK) input goes high. When the reset (RST) input is high, the counter is reset to its initial state, with all outputs set to zero. This means that the 3-bit up counter counts from 0 to 7 in binary every time the clock input goes high.

## Wiring Diagrams

The wiring diagrams for the 3-bit asynchronous up counter are relatively simple. Each flip-flop needs to be connected to the clock input and the reset input. The outputs of each flip-flop need to be connected to the clock input of the next flip-flop. The following diagram shows the wiring diagram of the 3-bit up counter.

![wiring diagram](https://i.stack.imgur.com/6X2fM.jpg)

The clock input is connected to all the flip-flops and the reset input is connected to the first flip-flop. The outputs of the first flip-flop are connected to the clock input of the second flip-flop, and so on. The outputs of the third flip-flop are the counter outputs, which can be used for various purposes.

In conclusion, the 3-bit asynchronous up counter is a simple and useful digital circuit that can be used in a variety of applications. It takes two inputs, a clock signal (CLK) and a reset signal (RST), and has three binary outputs. The circuit diagram and truth table of the 3-bit asynchronous up counter have been discussed in this article, along with the wiring diagrams related to this particular circuit.

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