Types of Multiplexer Applications, Uses, Circuit and Truth Table

There are mainly four types of multiplexers mostly used. Here you will find all types of the multiplexer truth tables and circuit diagrams. There are many important applications of Multiplexer are available which are given in this article. So let's know the Multiplexer Applications, uses.

The multiplexer is a device that takes no. of digital inputs at a time but gives only one output at a time. The multiplexer mainly used to transmit two more digital signals over a single transmission line.

Types of Multiplexer

Multiplexers are classified based on the no. of input. There are mainly four types of Multiplexer mostly used which are,

• 2 to 1 Multiplexer
• 4 to 1 Multiplexer
• 8 to 1 Multiplexer
• 16 to 1 Multiplexer

Multiplexer Truth Table and Circuit

There are different types of multiplexer that have different truth tables and circuit diagrams. The circuit diagram and truth table of each type of multiplexer are given below.

2 to 1 Multiplexer 

As you see in the below figure, 2 to 1 Multiplexer has two inputs pins(A, B), one output pin(Y), and one select pin(S). This multiplexer takes two digital input signal at a time but gives only one output. We control the output of that multiplexer using the select pin.

4 to 1 Multiplexer

As you see in the below figure, the 4 to 1 multiplexer has four input pins(A, B, C, D), one output pin(Y), and two select pins(S0, S1). This multiplexer takes four digital input signals at a time but gives only one output. The output behavior can be observed in the truth table.

8 to 1 Multiplexer

As you see in the below figure, the 8 to 1 multiplexer has eight input pins, one output pins, and three select pins. This multiplexer takes eight digital input signals at a time but gives only one output. The output behavior can be observed in the truth table.

16 to 1 Multiplexer

Here the 16 to 1 multiplexer is built using five 4 to 1 multiplexers. Each multiplexer has four input pins, so the four multiplexers are used for inputs. The output of the four multiplexers is given to another 4 to 1 multiplexer.

Multiplexer Applications and Uses

1. The main application of multiplexers in the communication system for data transmission purposes. The multiplexer is used to transmit a huge amount of data from different channels or multiple data packets through a signal transmission line which reduces the data transmission cost, increases efficiency, etc.

2. The multiplexer is used in computer and microcontroller peripherals. For example, a multiplexer in a multiplex keyboard takes different data from the keyboard and sends it to the computer through a single port and wire.

3. In the television broadcasting system, multiplexing is used. A lot of different channels come to the cable TV box in our home through a single cable. Television broadcasting system uses frequency division multiplexing system.

4. A multiplexing system is used to reduce the no. of pins of a microprocessor, microcontroller or CPU. We know that the 8085 microprocessor uses a multiplexing system to use the D0 to D7 pins for both address and data transmission.

5. Multiplexing system is also used in computer memory. Using the multiplexing system we can reduce the no of addresses and data pins of a memory chip.

6. In satellite communication, a GPS system multiplexer is used.

7. The multiplexer is used in Programmable Logic Control or PLC system to maintain a no. input and output devices.

8. The multiplexer is used analog circuit when a no. of sensors and transducers are connected in a circuit.

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