Digital Electronics. 8. Multiplexer & Demultiplexer. Module Multiplexers and Demultiplexers. 1 Introduction. 2 Principles of Multiplexing and Demultiplexing. 4 Sep The multiplexer used for digital applications, also called digital multiplexer, is a A demultiplexer is a circuit with one input and many output. 27 Mar The Digital Electronics Basics series present the fundamental theories and concepts taught at entry level electronics courses at both 2 year and.

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Multiplexer allows the process of transmitting different type of data such as audio, video at the same time using a single transmission line.

The IC requires a supply voltage of 5V which can be tolerated up to 5. The minimized boolean expression is then converted into logic gate diagram which is built on a breadboard using series ICs.

Digital Electronics – Multiplexer and Demultiplexer Circuits

You will notice that the resulting output is indicated by the illumination of the respective LED on the right hand side as shown below:. Let them know that this is important for them to grasp, but do not simply provide ready-made answers for them! For example, can it select an analog waveform, such as human speech from a microphone? Learn more about our privacy policy. Retrieved from ” https: Demultipleder multiplexer and demultiplexer circuits are constructed as follow.


Digital Electronics: Principles, Devices and Applications by Anil K. Maini

What terminal s do we use for the signal input, if using this chip as a demultiplexer and not just a decoder? It takes information from one line and distributes it to a given number of output lines. The analog multiplexer selects one of the eight potentiometer signals at a time, stepping from one to the next at the pace of the clock pulse: The IC has the following pin configuration.

Latest Blogs Web Browsers: In addition to the input and output lines, the multiplexer has data select lines through which the data passed from an input line to the output line is determined [1] as shown below:. What if it was 40 kHz?

Take for example this Boolean SOP expression, shown beside a symbol for a channel multiplexer: Since there are two select pins and data from each input is routed through one AND gate, 3-input AND gates are required for the circuit.


Larger Multiplexers can be constructed by using smaller multiplexers by chaining them together. Thankfully, digitap is such a device commonly and inexpensively produced, called a CMOS bilateral switch: The image to the right demonstrates this benefit.

They forward the data input to one of the outputs depending on the values of the selection inputs.

The series has several ICs that contain multiplexer s:. It has the following truth table.

A multiplexer is a circuit that accepts many inputs and channelize digital data to only one output. You May Also Like: If your students will be working with real circuits, then they should learn on real circuits whenever possible. Also, identify which mlutiplexer of these digital functions are usually performed by the same integrated circuit.


I highly recommend CMOS logic circuitry for at-home experiments, where students may not have access to a 5-volt regulated power supply. Electroonics will find digtal circuit below: The output of the OR gates has a voltage of 3.

It is like having four low-current solid-state relays in a single integrated circuit. While this approach makes students proficient in circuit theory, it fails to fully educate them.

Similarly, if you chose 0 1 for the data select lines which refer to the 2 nd input line the output will be high If TTL, the power supply must be a 5-volt regulated supply, adjusted to a value as close to 5. It must be noted that the selected ICs have compatible input, output and supply voltage levels as they are taken from a common family 74XX series of digital ICs.

The data select lines amd only one gate at a time and the data on the data input line passes through the selected gate to the associated data output line.