Spring 2011 ece 331 digital system design 30 using a 2ninput multiplexer use a 2ninput multiplexer to realize a logic circuit for a function with 2n minterms. A digital device capable of selecting one input out of its multiple input lines and forwarding it on a common output line is called a multiplexer. In digital electronics the multiplexer also known as the data selector or mux is the multiple input and single output digital circuit. N number of input signals are simultaneously connected to the multiplexer and a specific input signal. Multiposition switches are widely used in many electronics circuits. If you would like the book as a word document and not a pdf, please contact the author at ckannatgettysburg. A mathematical model of the designed gene networks has been defined and simulations have been. A 4to1 multiplexer and its truth table, as discussed in example 4.
In electronics, a multiplexer also known as a data selector, is a device that selects between several analog or digital input. Multiplexers can select data input lines as per our requirement. A variety of practical electronic applications require multiplexing, where several input. 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 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. 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 to do just that is called a multiplexer the multiplexer, shortened to mux or mpx, is a combinational logic circuit designed to switch one of several input lines through to a. Flipflops and latches are fundamental building blocks of digital electronics systems used in computers, communications, and many other types of systems. Flipflops are formed from pairs of logic gates where the gate outputs are fed into one,of the inputs of the other gate in the pair. Digital electronicsasychronous devicedigital multiplexer. The single pole multiposition switch is a simple example of nonelectronic circuit of multiplexer, and it is widely used in many electronic circuits. A multiplexer also known as a mux or data selector is a circuit which can deliver single output from multiple inputs. A multiplexer of 2n inputs has n select lines, which are used to select which input line to send to the output. An simple example of an non electronic circuit of a multiplexer is a single pole multiposition switch.
Multiplexers are also known as data n selector, parallel to serial convertor, many to one circuit, universal logic circuit. A simple encoder or simply an encoder in digital electronics is a onehot to binary converter. Types of multiplexers fdm, tdm, wdm and dwlm etc with their applications. The multiplexer used for digital applications, also called digital multiplexer, is. Multiplexers are mainly used to increase the amount of data that can. For n input lines, log n base2 selection lines, or we can say that for 2 n input lines, n selection lines are required. A flip flop is an electronic circuit with two stable states that can be used to store binary data. A multiplexer mux is a device which selects one of many inputs to a single output. The illustrated gate level example implements the simple. Multiplexing and demultiplexing logic functions for computing. Multiplexer mux and multiplexing tutorial basic electronics. In electronics, a multiplexer or mux is a device that selects one of several analog or digital input signals and forwards the selected input into a single line. D3 surround sound system mux types n digital b a selected source. Digital electronics interview questions and answers.
The stored data can be changed by applying varying inputs. As against demultiplexer also known as demux simply reverses the operation of mux and operates on single input but transmits the data to multiple outputs. A multiplexer or mux is a device that has many inputs and a single output. Introduction to multiplexer projectiot123 technology. The value of the control inputs determines the data input that is selected. A demultiplexer of 2 n outputs has n select lines, which are used to select which output line to send the input. Electronicsmultiplexers wikibooks, open books for an. Since there are n selection lines, there will be 2 n possible combinations of zeros and ones.
Mux sends digital or analog signals at higher speed on a single line in one. This hybrid analogdigital device uses digital logic signals highlow to activate. For digital application, they are built from standard logic gates. Pdf multiplexers demultiplexers fajar widiawan academia. The multiplexer also known as a mux operates on several inputs but provide a single output. The inputs to a multiplexer circuit may be analog or digital. Introduction to electronic engineering 8 preface preface electronics is a science about the devices and processes that use electromagnetic energy conversion to transfer, process, and store energy, signals and data in energy, control, and computer systems. Spring 2011 ece 301 digital electronics 3 multiplexers a multiplexer has 2n data inputs n control inputs 1 output a multiplexer routes or connects the selected data input to the output. J hoolan, in telecommunications engineers reference book, 1993. Here, we have prepared important digital electronics interview questions and answers which will help you get success in your interview. A multiplexer is a device that brings the concept of a rotary switch in analog electronics to the digital side. A multiplexers mux is a device that allows digital information from several sources to be routed onto a single line for transmission over that line to a common destination. The major factor that differentiates multiplexer and demultiplexer is their ability to accept multiple input and single input respectively. In digital electronics we are treating basically with logics.
The demultiplexer converts a serial data signal at the input to a parallel data at its output. Kaushik and others published digital electronics find, read and cite all the research you need on. A demultiplexer or demux is a device that takes a single input line and routes it to one of several digital output lines. Physically, a multiplexer has n input pins, one output pin, and m control pins. Multiplexers in digital logic it is a combinational circuit which have many data inputs and single output depending on control or select inputs. The purpose of the multiplexer is to select one of the several input signals and forward it at the output.
Multiplexer and demultiplexer is a combinational of digital logic switching. Its central function, from the network managers viewpoint, is to concentrate many users or information channels on to a single transmission channel in order to maximise the efficiency of that channel. Circuits and systems is written according to th e ugc p rescribed cbcs syllabus core coursevii for ph ysics honours students. These find application in various realms of digital and as well as analogue electronics. We can have n control bits to select from 2n input bits. The multiplexer is one of the most important components in communications networking. If you are looking for a job which is related to digital electronics then you need to prepare for digital electronics interview questions. The multiplexer is used to perform highspeed switching and is constructed by electronic components multiplexers are capable of handling both analog and digital applications. There are three main ways of constructing a multiplexer. Multiplexer in digital electronics pdf digital electronics basics chapter 5. It is a combinational digital circuit and generally called a data selector as well.
Design and simulation of decoders, encoders, multiplexer. For someone who is interested in digital circuits, this book is worth downloading. The outputs of upper 1x4 demultiplexer are y 7 to y 4 and the outputs of lower 1x4 demultiplexer are y 3 to y 0. In this lesson we will study digital multiplexing in which the number of inputs is a power of two 2, 4, 8, 16, and there is one output. In other words, the rotary switch is a manual switch that you can use to select. A multiplexer is a circuit used to select and route any one of the several input signals to a signal output. A multiplexer of inputs has select lines, which are used to select which input line to send to the output. An electronic multiplexer is a multipleinput, singleoutput switch. Multiplexer is a combinational circuit that has maximum of 2 n data inputs, n selection lines and single output line. We can implement 1x8 demultiplexer using lower order multiplexers easily by considering the above truth table.
The selected line decides which ip is connected to the op, and also increases the amount of data that can be sent over an nw within a certain time. The term multiplexing can have multiple interpretations. It is a combinational circuit which have many data inputs and single output depending on control or select inputs. An simple example of an non electronic circuit of a multiplexer is a single pole multiposition. Multiplexer is a crucial combinational circuit which is used in various significant application. We can refer to a multiplexer with the terms mux and mpx too. Simply put, digital circuits have become a ubiquitous and indispensable part of modern life. Often it is easier to use a ms word file rather than a pdf file. Multiplexer and demultiplexer circuits and apllications. Multiplexer handle two type of data that is analog and digital.
For analog application, multiplexer are built of relays and transistor switches. Since a multiplexers job is to select one of the data input lines and send it to the output, it is also known as data selector. A multiplexer is useful for sending large amounts of data over a network with a lower bandwidth and time than an equivalent circuit without a multiplexer. In analog applications, multiplexers are made up of of. Chapter 6 registers and counter nthe filpflops are essential component in clocked sequential circuits.
Ee4512 analog and digital communications chapter 7 if the data sources have different rates a multiplexer scheme must reconcile the disparate rates. After identifying which is which, provide definitions for multiplexer and. Spring 2011 ece 301 digital electronics 21 using a 2ninput multiplexer use a 2ninput multiplexer to realize a logic circuit for a function with 2n minterms. Frequently additional gates are added for control of the. Multiplexer meaning in the cambridge english dictionary. Digital circuits multiplexers multiplexer is a combinational circuit that has maximum of 2n data inputs, a na selection lines and single output line. An important class of electronic circuits is made of digital.
The single pole multiposition switch is a simple example of non electronic circuit of multiplexer, and it is widely used in many electronic circuits. It is a device which, based on some input, will change the connection of its other inputs to its outputs. The book digital electronics contains twelve chapters with comprehensive. John crowe, barrie hayesgill, in introduction to digital electronics, 1998. So what exactly are digital circuits and why should we care about them. That is, if there are 2 n input lines, and at most only one of them will ever be high, the binary code of this hot line is produced on the nbit output lines for example, a 4to2 simple encoder takes 4 input bits and produces 2 output bits. So, each combination will select only one data input. A 2nto1 multiplexer sends one of 2n input lines to a single output line. This is the reason multiplexers are often termed as data selectors. On the basis of decimal number system discussed above one may define very. Multiplexers and demultiplexers this worksheet and all. Electronics tutorial about the multiplexer mux and digital multiplexers used in.
When the enable input is active, the circuit mux in this case works normally when the enable input has the inactive value, the circuits outputs are all inactive. Chapter 7 multiplexing techniques temple university. Conceptually a digital multiplexers functionality is the same as an analog one, only it handles everything digitally. In most cases a digital multiplexer is a digital selector. Multiplexer definition, having many parts or aspects. A multiplexer, like many other circuits, can have additional enable inputs. The multiplexer used for digital applications, also called digital multiplexer, is a circuit with many input but only one output.