Skip to main content

Multiplexers and De-multiplexers

Multiplexers and Demultiplexers Introduction

There are many applications where many devices or systems need to access a common transmission media.


Let us consider our cable TV system, in which multiple TV channels are received at home via a shared transmission media. Similarly, in computer networking, many computers need to access a common printer or other shared hardware.


In Smart instrumentation, a PC or microcontroller can acquire data gathered from many sensors through a single ADC. Our telephone exchanges utilize these multiplexers and demultiplexers extensively.


Multiplexers and demultiplexers are normally used for sharing resources. Multiplexers route the data from many sources to one destination and demultiplexers redistribute data back from one source to many destinations. In this module you will learn about the basic architecture of multiplexers and demultiplexers along with real life applications.


Principles of Multiplexing and Demultiplexing

Let us now begin with principles of multiplexing and demultiplexing. Let us consider a system with n-inputs. Multiplexing means sharing. It means many to one. A multiplexer (MUX) is a device that allows digital information from several inputs to be routed on to a single line for transmission.


The multiplexed data is transmitted over a single line to a common destination. Demultiplexer accepts this data and redistributes it to the n outputs.


Data select lines are used in many into one operation of multiplexer and one to many operation of demultiplexer. In short, multiplexers and demultiplexers are combinational circuits designed to provide sharing of resources. The keyword is sharing.


Multiplexer

Multiplexer means many to one. A multiplexer (MUX) is a combinational circuit which is often used when the information from many sources must be transmitted over long distances and it is less expensive to multiplex data onto a single wire for transmission.


A multiplexer can be considered as the semiconductor equivalent of a multi-position switch. It is a combinational logic circuit which has many input lines and a single output line. The basic operation is controlled by a selector line that routes one of many input signals to the output.


Multiplexers are also called a DATA Selector or router because it accepts several data inputs and allows only one of them to get through to the output at a time.


The basic multiplexer has n input lines and single output line. It also has m – select or control lines. The relation between number of select lines and number of data inputs are 2^m = n As the multiplexer selects one out of many, it is often called a 2^m to 1 line converter.


Applications of multiplexers

Multiplexer or data selectors are combinational circuits which transfer data from many sources to output under the control of data select lines.


Multiplexer has many applications right from data routing, time division multiplexing, function generator to parallel to serial converter etc. A single multiplexer can replace several logic gates ICs, saving PCB area, interconnections, design efforts and cost.


A list of popular applications is given below.

  • Data routing
  • Data bussing
  • Switch setting comparator
  • Multiplexer as a function generator
  • Parallel to serial converter
  • Cable TV signal distribution
  • Telephone network
  • Sharing printer /resources

Demultiplexer

Demultiplexer has a single input and n output lines. Demultiplexer can be visualized as reverse multi-position switch.


Demultiplex means one into many. A demultiplexer reverses the multiplexing operation. In other words, the demultiplexer takes one data input source and selectively distributes it to 1 of N output channels just like a multi-position switch. It also has ‘m’ select lines for selecting the desired output for the input data as shown in fig. 10. The mathematical relation between select lines and ‘n’ output are: 2^m = n


A demultiplexer takes data from one input line and distributes over a 2^m output line, hence it is often referred to as a 1 to 2m line converter. There are four basic types of demultiplexers: 1 to 2 demultiplexer, 1 to 4 demultiplexer, 1 to 8 demultiplexer and 1 to 16 demultiplexer as shown in fig. 11. Number of select lines decides this classification


Applications of Demultiplexers

Digital demultiplexers are combinational devices controlled by a selector address that routes input data to one of many outputs of the demultiplexers. These can be used in following applications.


  • Data demultiplexing
  • Clock demultiplexing
  • Memory addressing
  • Four phase clock generator
  • Function generation using DEMUX
  • Switch encoding
  • Serial to parallel converter

Labels:

Comments

Post a Comment

Please give us feedback through comments

Trending⚡

Happy birthday Hardik Pandya | In C programming

  Happy birthday Hardik Pandya . Now you are  28 years old. Great achievement you have. Let's we want to talk more about Hardik pandya. He is great cricketer. Pandya is awesome. In this Blog Post we are going to wish pandya " Happy birthday using C program". Let's tune with us till end. Now we have to wish pandya, so we are going to use printf () function printing message to pandya as " Happy birthday Hardik pandya Now you are 28 years old". Hardik pandya was born on 11 October in 1993. Now we are going to declare a variable called as current_age = 2021 - 1993. It calculate current age Of Hardik pandya. See the "Happy birthday pandya" using c programming. If you liked this Blog Post then don't forget to share with your computer science learning friends. Once again " Happy birthday Hardik Pandya sir". Read also Happy Rakshabandhan wish using C program Friendship day 2021 greetings in C
Post a Comment
Read more

What is programming explained in simple words

Hi my dear friends today in this blog post we are going to know what programming is? In simple words I will explain to you programming. Nowadays we are watching real life use of programming. How computers learn to speak, talk and do the specified complex task for us. We are all keen to know what is exactly programming? Programming is the process of creating instructions that a computer can understand and execute. These instructions, also known as code, are written in a programming language that is specific to the task at hand. The history of programming can be traced back to the mid-20th century, with the development of the first electronic computers. The first programming languages were known as machine languages, which were specific to a particular type of computer. As computers became more sophisticated, high-level programming languages were developed, such as FORTRAN and COBOL, which were easier for humans to read and write. These languages allow programmers to write code t
Post a Comment
Read more

check number is prime or odd or even using c program

Here is the c program to check if the user entered number is prime ,even and odd. These few lines of code solve three problems. In the above program we used integer type num variable for storing user entered numbers. Then we used the IF condition statement. That's all. IF condition for even number In the First IF statement we have a logic. If the number is divided by two then the reminder should be 0 then the number is an even number else not an even number. That simple logic is implemented in the first if statement. IF condition for odd number In the second IF statement we Implemented odd number logic. We identify odd numbers just by making little change in even number logic. If the number is divided by two then the reminder should not be a zero. Then the number is odd. That's simple logic used to identify whether a number is odd or not an odd number. IF condition for prime number In the third IF condition we implemented the logic of the prime number. In this IF
Post a Comment
Read more

Graph Data Structure

Graph A graph can be defined as a group of vertices and edges that are used to connect these vertices. A graph can be seen as a cyclic tree, where the vertices (Nodes) maintain any complex relationship among them instead of having parent child relationship. A graph G can be defined as an ordered set G(V, E) where V(G) represents the set of vertices and E(G) represents the set of edges which are used to connect these vertices. A Graph G(V, E) with 5 vertices (A, B, C, D, E) and six edges ((A,B), (B,C), (C,E), (E,D), (D,B), (D,A)) is shown in the following figure. Directed and undirected graph Graph terminology Graph Representation Directed Graph Adjancency Matrix Graph Traversal Depth first search algorithm Directed and undirected graph A graph can be directed or undirected. However, in an undirected graph, edges are not associated with the directions with them. An undirected graph does not have any edges in directions. If an edge exists between ver
Post a Comment
Read more

How to write programs in Bhai language

Bhai Language Bhai language is fun Programming language , with this language you can makes jokes in hindi. Bhai language written in typescript. It's very funny , easy and amazing language. Keywords of this language written in Hindi . Starting and ending of the program Start program with keyword " hi bhai " and end with " bye bhai ". It's compulsory to add this keyword before starting and end on the program. You write your programming logic inside this hi bhai and bye bhai . How to declare variables in Bhai language We use " bhai ye hai variable_name" keyword for declaring variables. In javascript we use var keyword for declaring variables but here you have to use " bhai ye hai " keyword. If you are declaring string then use " " double quotes. You can use Boolean variable like sahi and galat for true and false . How to print output in Bhai language You have to use " bol bhai " keyword for
Post a Comment
Read more