Type number orderable part number ordering code 12nc package buy from distributors. 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. Multiplexer and demultiplexer electronics circuits elprocus. Increases the capacity of low level channels into high level channels.
In the following article we will discuss the construction and operataion of multiplexer and demultiplexer in detail. Physically, a multiplexer has n input pins, one output pin, and m control pins. The role of a multiplexer is to receive the information from different senders and deliver it to its output. There are three main ways of constructing a multiplexer. Gate lecture on designing of multiplexer part 3 digital electronics hindi language duration.
Multiplexer and demultiplexer are two devices very important in data communications. Since a multiplexer s job is to select one of the data input lines and send it to the output, it is also known as data selector. 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. Demultiplexers combinational logic functions electronics. Mar 11, 2017 gate lecture on designing of multiplexer part 3 digital electronics hindi language duration. Hef4051b all information provided in this document is subject to legal disclaimers. Cd74hc4051ep analog multiplexer and demultiplexer datasheet. Multiplexer handle two type of data that is analog and digital. The multiplexer component is used to select 1 of n inputs while the demultiplexer component is used to route 1 signal to n outputs. Multiplexer and demultiplexer free download as word doc. Apr, 2017 multiplexer in digital electronics multiplexer in dld cctv multiplexer. The multiplexer used for digital applications, also called digital multiplexer, is. This product has been qualified to the automotive electronics council aec standard q100. Q 1 consider the multiplexer based logic circuit shown in the figure.
Credits to the authors that have contributed in this lecture notes. 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. By setting the input to true, the demux behaves as a decoder. A demultiplexer is a combinational logic circuit that performs the opposite function as that of a multiplexer. Enables multiple analog signals or digital data streams to be transferred along the same channel over a shared medium. So, each combination will select only one data input. This description sounds similar to the description given for a decoder, but a decoder is used to select among many devices while a demultiplexer is used to send a. 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.
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. The device or switching circuitry used to select and connect one of these several signals to the load at any one time is known as a multiplexer the reverse function of multiplexing, known as demultiplexing, pertains to the process of feeding several. One the input signals is a selection signal which chooses which signal gets to go out. Its characteristics can be described in the following simplified truth table. Oct 09, 2018 a demultiplexer is a combinational logic circuit that performs the opposite function as that of a multiplexer. A multiplexer takes parallel information and routes or funnels them onto a single serial line. 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 are mainly used to increase the amount of data that can. By receiving a select data, a multiplexer is instructed from which sender to receive data.
Rig up the circuit as shown in the logic circuit diagram. It is used when a circuit intends to send a signal to one of many devices. Minimizes ic package count and logic design is simplified. The circuit basically consists of n and gates, one for each of the 2 m possible combinations of the m control inputs, with the single line input fed to all of. On the contrary, demultiplexer utilizes the control signal and allows us to have multiple outputs. The reverse of the digital multiplexer is the digital demultiplexer.
The multiplexer mux the operation of sending one or more analog or digital signals over a common transmission line at different times or speeds is known as multiplexing, and the device used to do this is known as multiplexer. Jul 23, 2015 the action or operation of a demultiplexer is opposite to that of the multiplexer. John crowe, barrie hayesgill, in introduction to digital electronics, 1998 4. In electronic devices, a demultiplexer is a logical circuit which takes a single input and sends out this input to one of several outputs. We can implement 1x8 demultiplexer using lower order multiplexers easily by considering the above truth table. The multiplexer used for digital applications, also called digital multiplexer, is a circuit with many input but only one output. Demultiplexer definition of demultiplexer by merriamwebster. A 4 to 1 multiplexer uses 2 select lines s0, s1 to determine which one of the 4 inputs i0 i3 is routed to the output z. A multiplexer of inputs has select lines, which are used to select which input line to send to the output. Difference between multiplexer and demultiplexer with. The multiplexer or data selector is a special combinational circuit that is one of the most widely used standard circuits in digital design.
The demultiplexer converts a serial data signal at the input to a parallel data at its output lines as shown below. Another key difference exists for mux and demux is that multiplexer is n to 1. A demultiplexer, sometimes abbreviated dmux, is a circuit that has one input and more than one output. As inverse to the mux, demux is a onetomany circuit. A demultiplexer is very much like a decoder with an enable. The demultiplexer converts a serial data signal at the input to a parallel data at its output. Demultiplexer definition is an electronic device that separates a multiplex signal into its component parts. Demultiplexers provide the reverse operation of multiplexers since they allow a single input to be routed to one of n outputs, selected via m control lines n 2 m. Cd74hc4051ep analog multiplexer and demultiplexer 1 features 3 description the cd74hc4051ep is a digitally controlled analog 1 controlled baseline switch that uses silicon gate cmos technology to one assembly and test site, one fabrication achieve operating speeds similar to lsttl, with the site low power consumption of standard cmos. The simplest type of multiplexer is the two line to one line data multiplexer.
As the name implies, their functions are opposite to each other similar to encoder and decoder. The output to which the input signal is to be passed is decided by the control logic. It is not necessary to use only discrete gates and, or, nand, nor. Multiplexer in digital electronics pdf digital electronics basics chapter 5. It is a combinational digital circuit and generally called a data selector as well. The relation between the number of output lines and the number of select lines is the same as we saw in a. The action or operation of a demultiplexer is opposite to that of the multiplexer. The idea is that you select one of the outputs and route an input signal to it. Let a be one of the inputs and b is the other input and y is the. 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. We can refer to a multiplexer with the terms mux and mpx too. In a demux, we have n output lines, one input line, and m select lines.
In fact the 749 1of4 decoder in the previous section is also known as a 1of4 demultiplexer. Multiplexer is a combinational circuit that has maximum of 2 n data inputs, n selection lines and single output line. 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. Digital electronics multiplexer demultiplexer this presentation will demonstrate the basic function of the multiplexer mux. When the e input is high, the selected output is high ok, they all are but thats not the. Multiplexer with the help of control signals selects the particular input that has to be transmitted at the output. Multiplexer demultiplexer multiplexer demultiplexer 2 this presentation will demonstrate the basic function of the multiplexer mux. A 1 to 4 multiplexer uses 2 select lines s0, s1 to determine which one of the 4 outputs y0 y3 is routed from the input d. Another key difference exists for mux and demux is that multiplexer is n to 1 device but demultiplexer is 1 to n device. Multiplexing is defined as the process of feeding several independent signals to a common load, one at a time. A multiplexer of 2n inputs has n select lines, which are used to select which input line to send to the output. Gate lecture on introduction to multiplexer part1 digital.
The relation between the number of output lines and the number of select lines is the same as we saw in a multiplexer. A multiplexer is a network that has many inputs and one output, and the value of the output will be the value of one of inputs which will be decided by some select lines. Think of it like a railroad switch but without moving parts. 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. For analog application, multiplexer are built of relays and transistor switches. The single pole multiposition switch is a simple example of nonelectronic circuit of multiplexer, and it is widely used in many electronic circuits.
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. The multiplexer component implements a 216 input mux providing a single output, based on hardware control signals. The reverse of the digital demultiplexer is the digital multiplexer. The control logic can be manipulated by changing the.
The multiplexer is used to perform highspeed switching and is constructed by electronic components multiplexers are capable of handling both analog and digital applications. Product images shown are for illustrative purposes only and may differ from the actual product. This circuit element is usually referred to as a 1ofn demultiplexer. In analog applications, multiplexers are made up of of. A multiplexer or mux is a device that has many inputs and a single output. Demultiplexers are mainly used in boolean function generators and. However, by using a multiplexer and a demultiplexer, one unit of a decoder can be shared between the four displays. Digital electronics circuits 2017 4 realization using nor gates 2 for the given truth table, realize a logical circuit using basic gates and nand gates procedure. One of these data inputs will be connected to the output based on the values of selection lines. A 4to1 mux designed with small scale integration ssi. Demultiplexers can be used to implement general purpose logic. With the use of a demultiplexer, the binary data can be bypassed to one of its many output data lines. To demonstrate a basic multiplexer demultiplexer system, and become familiar with different types of multiplexer and demultiplexer.
Buy 16channel analogdigital multiplexerdemultiplexer. This enables the use of current limiting resistors to interface inputs to voltages in excess of vcc. Demultiplexer performs the reverse operation of the multiplexer i. These devices are used for sharing a device between two or more applications. In simple words, it is the reverse of demultiplexer demux.
24 531 735 670 128 339 1196 148 941 126 1148 844 1276 1180 1229 1087 691 1044 1242 756 1508 802 788 1072 600 1237 889 675 1053 33 824