The demultiplexer takes one single input data line and then switches it to any one of a number of individual output lines one at a time. Multiplexers and demultiplexers columbia gorge community college. E electrical and electronics engineering, second year 3rd semester ee6301 digital. Lecture notes for digital electronics university of oregon. By setting the input to true, the demux behaves as a decoder. Electronics tutorial about the demultiplexer demux used for data distribution in combinational logic circuits including digital decoders. Click here to return to the toolbox page the multiplexer and demultiplexer library of the toolbox contains blocks for multiplexing or demultiplexing signals in various ways. As an example, a device that passes one set of two signals among four signals is a twobit 1to2 demultiplexer. The input will be connected to one of these outputs based on the values of selection lines. Demultiplexer demux digital decoder tutorial electronics tutorials. An encoder is a digital circuit that performs the inverse operation of.
Ee6301 digital logic circuits previous year question papers. Demultiplexer demux digital decoder tutorial electronics. Electronics tutorial about the multiplexer mux and digital multiplexers used in. Though it may be hard for you to believe, there was. For analog application, multiplexer are built of relays and transistor switches. A demultiplexer or demux is a device that takes a single input line and routes it to one of several digital output lines. This article explains different types of demultiplexers. It is a process of taking information from one input and transmitting over one of many outputs. While using multisim to simulate circuits and deploy them to the fpga on the dsdb. A demultiplexer function exactly in the reverse of a multiplexer, that is a demultiplexer accepts only one input and gives many outputs. The book digital electronics contains twelve chapters with comprehensive. Digital electronics and logic design tutorials geeksforgeeks.
A basic idea regarding the initial concepts of digital electronics is enough to understand the topics covered in this tutorial. Digital electronics part i combinational and sequential. Multiplexers are capable of handling both analog and digital applications. In analog applications, multiplexers are made up of of relays and transistor switches, whereas in digital applications, the multiplexers are built from standard logic gates. A demultiplexer is a data distributor read as demux. A basic and gate consists of two inputs and an output. The multiplexer used for digital applications, also called digital multiplexer. Both demultiplexers and multiplexers have similar names, are often used to also mean a demultiplexer, or a multiplexer and a demultiplexer pdf version, one use for multiplexers is economizing connections over a single channel, by connecting the multiplexers single output to the demultiplexers. Demultiplexers can be used to implement general purpose logic. Digital design with an introduction to the verilog hdl by m. The states of a digital computer typically involve. While using multisim and ni elvis to simulate circuits and deploy them to the fpga on. Demultiplexers are mainly used in boolean function generators and decoder circuits. Its interesting to note that the enabledata input is immediately inverted and that nand gates are used to generate the outputs.
Digital electronics principles devices and applications about the book. In digital circuitry, however, there are only two states. Its circuit is or by expressing the circuit as shows that it could be two onebit 1to2 demultiplexers without changing its expected behavior. With analog representation, the quantity is symbolized in a way that is in.
If the two inputs are a and b, the output often called q is on only if both a and b are also on. Pdf multiplexers demultiplexers fajar widiawan academia. The action or operation of a demultiplexer is opposite to that of the multiplexer. The decoder is an electronic device that is used to convert digital signal to an. The data distributor, known more commonly as a demultiplexer or demux for short, is the exact opposite of the multiplexer we saw in the previous tutorial. Basic electronics chapter 2, 3a test t5, t6 basic electrical principles and the functions of components figures in this course book are reproduced with the permission of the american radio relay league. A 2nto1 multiplexer sends one of 2n input lines to a single output line. Aims to familiarise students with combinational logic circuits sequential logic circuits how digital logic gates are built using transistors design and build of digital. When the multiplexer is used for digital applications, it is called a digital multiplexer. This tutorial is meant for all the readers who are aspiring to learn the concepts of digital circuits.
To understand electronic circuits it is normal to draw a circuit diagram or schematic. The multiplexer or data selector is a special combinational circuit that is one of the most widely used standard circuits in digital. Multiplexer in digital electronics pdf digital electronics basics chapter 5. The world of electronics was initially dominated by analogue signalsthat is, signals representing a continuous range of values. Pdf version a demultiplexer, sometimes abbreviated dmux, is a circuit that has one input and more than one output. The multiplexer used for digital applications, also called digital. Digital circuits contain a set of logic gates and these can be operated with binary values, 0 and 1. Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.
Electronics tutorial about the multiplexer mux and digital multiplexers used in combinational logic circuits for the multiplexing of data signals. Practice problems on digital electronics and logic design. In other words, the rotary switch is a manual switch that you can use to select. With the use of a demultiplexer, the binary data can be bypassed to one of its many output data lines. A multiplexers mux is a combinational logic component that has several inputs and only one. Multiplexing is the generic term used to describe the operation of sending one or more analogue or digital signals over a common transmission line at different times or speeds and as such, the device we use. Download digital electronics principles devices and. This diagram is like the london underground map it shows how. In this lesson we will study digital multiplexing in. For n input lines, log n base2 selection lines, or. For digital application, they are built from standard logic gates. Digital electronics handwritten notes pdf free download. Different inputoutput configuration demultiplexers are.
Multiplexers a multiplexers mux is a combinational logic component that has several. Thus we have confirmed the functionality of this multiplexer circuit according to the theory of operation we studied at the beginning of this tutorial. Digital electronics part i combinational and sequential logic dr. Multiplexers and demultiplexers national instruments. Generally multiplexer and demultiplexer are used together, because of the communication systems are bi directional. With digital representation, the quantity is symbolized in a way that is discretely packaged.
Digital circuits demultiplexers demultiplexer is a combinational circuit that performs the reverse operation of multiplexer. Multiplexers in digital logic it is a combinational circuit which have many data inputs and single output depending on control or select inputs. A demultiplexer demux performs the inverse operation, taking one input and sending it to one of many possible outputs. The multiplexer acts like an electronic switch that selects one from different. A 1to4 demultiplexer can easily be built from 1to2 demultiplexers as follows. It has single input, n selection lines and maximum of 2 n outputs. Download free book analog and digital electronics first edition by daniel adam steck pdf. Whats happening is that the logic is done in an activehigh. Demultiplexers and multiplexers digital circuits 3. While using multisim to simulate circuits and deploy them to the fpga on the dsdb board, students will reflect on the similarities and differences between encoders and multiplexers, examine the function of a basic 2to1 multiplexer using logic gates, and observe the behavior.
An simple example of an non electronic circuit of a multiplexer is a single pole. Demultiplexer is a combinational circuit that performs the reverse operation of multiplexer. Digital circuits multiplexers multiplexer is a combinational circuit that has maximum of 2n data inputs, a. It is used when a circuit wishes to send a signal to one of many devices. Ee6301 digital logic circuits previous year question papers february 26, 2018 may 25, 2019 syed afrith b. Multiplexer handle two type of data that is analog and digital. A demultiplexer of 2 n outputs has n select lines, which are used to select which output line to send the input. In this lab, students will learn how multiplexers and demultiplexers work, as well as the basics of clock multiplexing.
Bistable devices popularly called flipflops described in modules 5. The multiplexer used for digital applications, also called digital multiplexer, is a circuit with many input but only one output. Demultiplexers a demultiplexer is a combinational digital. A multiplexer is a circuit that accept many input but give only one output. Multiplexer mux and multiplexing tutorial electronicstutorials. As inverse to the mux, demux is a onetomany circuit. Digital electronics is essential to understanding the design and working of a wide range of applications, from consumer and industrial electronics. Digital logic design introduction a digital computer stores data in terms of digits numbers and proceeds in discrete steps from one state to the next.