Q 1 consider the multiplexer based logic circuit shown in the figure. 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. A multiplexer takes parallel information and routes or funnels them onto a single serial line. As inverse to the mux, demux is a onetomany circuit.
Multiplexer and demultiplexer circuits and apllications. 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 these gates. Multiplexer demultiplexer 3 x analog inputsoutputs channel select inputs 14 15 12 1 5 2 4 11 10 9 6 x0 x1 x2 x3 x4 x5 x6 x7 a b c enable ordering information device. Another key difference exists for mux and demux is that multiplexer is n to 1 device but demultiplexer is 1 to n device.
A demultiplexer function exactly in the reverse of a multiplexer, that is a demultiplexer accepts only one input and gives. The value on the output of such a device is the value nth data input, where n is the binary number on. The term multiplexer which is also commonly called as mux or mpx refers to selecting one output of the many available inputs. The demultiplexer is a combinational logic circuit designed to switch one common input line to one of several seperate output line the data distributor, known more commonly as a demultiplexer or. In this animated object, learners examine how a multiplexer and a demultiplexer work together when their data select lines are connected to the same binary counter. A multiplexer encoder mux is a selector device that has 2i data inputs, and i select inputs. A multiplexer or mux is a device that has many inputs and a single output. Figure 1b gives a truth table for this multiplexer, and figure 1c shows its circuit symbol. Since only one and gate will ever be active this determines which output the input is fed to.
Multiplexers and demultiplexers are often confused with one another by students. T here are two data inputs d0 and d1, and a select input called s. Multiplexer mux and multiplexing tutorial electronicstutorials. A multiplexer is a circuit used to select and route any one of the several input signals to a signal. Set each oscillator at a different frequency, so you can more easily make sure that the circuit is working correctly when you test it with different combinations of enable inputs s 0 and s 1. Sep 04, 2015 a multiplexer is a circuit that accept many input but give only one output.
The relation between the number of output lines and the number of select lines is the same as we saw in a multiplexer. An simple example of an non electronic circuit of a. 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 schematic symbol for a multiplexer is an isosceles trapezoid with the longer parallel side containing the input pins and the short parallel side containing the output pin. June 23, 2003 basic circuit design and multiplexers 11 a 2to1 multiplexer here is the circuit analog of that printer switch. You will probably need a few more wires and a split to complete your classs 4. 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. The schematic symbol for a multiplexer is an isosceles. On the contrary, demultiplexer utilizes the control signal and allows us to have multiple outputs. A multiplexer is a circuit used to select and route any one of the several input signals to a signal output. To ensure the highimpedance offstate during powerup or powerdown, oe should be. Multiplexer and demultiplexer a multiplexer is a circuit that accept many input but give only one output. Since there are n selection lines, there will be 2 n possible combinations of zeros and ones.
In this lesson we will study digital multiplexing in. 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. The multiplexer routes one of its data inputs d0 or d1 to the output q. The demultiplexer is a combinational logic circuit designed to switch one common input line to one of several seperate output line 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. Mux directs one of the inputs to its output line by using. A multiplexers mux is a device that allows digital information from several sources to be routed onto a single line. A multiplexers mux is a combinational logic component that has several inputs and only one output. Demultiplexers are mainly used in boolean function generators and. 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. Ti defines green to mean the content of chlorine cl and bromine br based flame retardants meet js709b low halogen requirements of multiplexer circuit is. A multiplexer is a circuit that accept many input but give only one output. One the input signals is a selection signal which chooses which signal gets to go out. Multiplexers, exclusive or gates, and parity circuits.
The role of a multiplexer is to receive the information from different senders and deliver it to its output. Multiplexer and demultiplexer circuit diagrams and. The selected line decides which ip is connected to the op, and also increases the. Laboratory 3 design multibit multiplexer and programming a fpga. Jameco sells 1 to 8 demultiplexer and more with a lifetime guarantee and same day shipping. Electronics tutorial about the multiplexer mux and digital multiplexers used in combinational logic circuits for the multiplexing of data signals. Draw the circuit connection in both logic diagram and pin diagram. Ti defines green to mean the content of chlorine cl and bromine br based flame retardants meet js709b low halogen. A demultiplexer function exactly in the reverse of a multiplexer, that is a demultiplexer accepts only one input and gives many outputs. In analog applications, multiplexers are made up of of.
However, by using a multiplexer and a demultiplexer, one unit of a decoder can be shared between the four displays. With the use of a demultiplexer, the binary data can be. Cd74hc4051ep analog multiplexer and demultiplexer datasheet. Multiplexer demultiplexer 3 x analog inputsoutputs channel select inputs 14 15 12 1 5 2 4 11 10 9 6 x0 x1 x2 x3 x4 x5 x6 x7 a b c enable ordering information device package shipping mc74lvxt4051dg soic. The operation of a multiplexerdemultiplexer circuit wisc. The multiplexer is used to perform highspeed switching and is constructed by electronic components multiplexers are capable of handling both analog and digital applications. This analog multiplexer and demultiplexer controls. Enhanced diminishing manufacturing sources analog voltages that may vary across the. Jul 23, 2015 the action or operation of a demultiplexer is opposite to that of the multiplexer.
The other selection line, s 3 is applied to 1x2 demultiplexer. A 4to1 mux designed with small scale integration ssi. This circuit element is usually referred to as a 1ofn demultiplexer. Nov 14, 2016 for the love of physics walter lewin may 16, 2011 duration. The outputs of upper 1x8 demultiplexer are y 15 to y 8 and the outputs of lower 1x8 demultiplexer are y 7 to y 0. A multiplexerencoder mux is a selector device that has 2i data inputs, and i select inputs. A multiplexer needs a dmux demultiplexer to finish the process which means to separate multiplex signals carried by the single shared medium or device. These devices are used for sharing a device between two or more applications. Oct 09, 2018 a demultiplexer is a combinational logic circuit that performs the opposite function as that of a multiplexer.
It is not necessary to use only discrete gates and, or, nand, nor, exor, exnor in the design of the combinational logic circuit, with the. The action or operation of a demultiplexer is opposite to that of the multiplexer. Demultiplexers combinational logic functions electronics. It is used when a circuit intends to send a signal to one of many devices. Hef4051b all information provided in this document is subject to legal disclaimers. 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. Professor shankar balachandran iitm explains multiplexing. Multiplexer is a combinational circuit that has maximum of 2 n data inputs, n selection lines and single output line. Digital circuits multiplexers multiplexer is a combinational circuit that has maximum of 2n data inputs, a. To demonstrate a basic multiplexer demultiplexer system, and become familiar with different types of multiplexer and demultiplexer. Difference between multiplexer and demultiplexer with. A demultiplexer function exactly in the reverse of a multiplexer, that is a demultiplexer accepts only one. The single pole multiposition switch is a simple example of nonelectronic circuit of multiplexer, and it is widely used in many electronic circuits.
Multiplexer and demultiplexer circuit diagrams and applications. With the use of a demultiplexer, the binary data can be bypassed to one of its many output data lines. 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. The value on the output of such a device is the value nth data input, where n is the binary number on the select inputs. 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. Demultiplexer takes one single input data line, and then switches it to any one of the output line. Laboratory 3 design multibit multiplexer and programming a. The inputs to a multiplexer circuit may be analog or digital. Pdf minimizing power of digital circuits is always the first priority for vlsi designers. One of these data inputs will be connected to the output based on the values of selection. Design a 2 to one multiplexer using nand gates only. The role of a multiplexer is to receive the information from different senders. Its characteristics can be described in the following simplified 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.
Reversible realization of quaternary decoder, multiplexer, and demultiplexer circuits article pdf available in proceedings of the international symposium on multiplevalued logic 152. The multiplexer is used to perform highspeed switching and is constructed by electronic components. Write down truth table and boolean expression for the output. 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.
Both demultiplexers and multiplexers have similar names, abbreviations, schematic symbols and circuits, so confusion is easy. To ensure the highimpedance offstate during powerup or. Dandamudi, fundamentals of computer organization and design, springer, 2003. For the love of physics walter lewin may 16, 2011 duration. In order to supply two universal devices that can detect any kind of input signal and that can express any protein as output, mux and demux circuits have been. A demultiplexer is a combinational logic circuit that performs the opposite function as that of a multiplexer. On the contrary, demultiplexer utilizes the control signal and allows us to have multiple. By receiving a select data, a multiplexer is instructed from which sender to receive data. Reversible realization of quaternary decoder, multiplexer. Use the symbols for the two inputs as i 0, and i 1, and the selection line as s, and the output as y. An electronic multiplexer can be considered as a multipleinput, singleoutput switch, and a demultiplexer as a singleinput, multipleoutput switch. A demultiplexer, sometimes abbreviated dmux, is a circuit that has one input and more than one output. If s 0 the multiplexers output m is equal to the input x, and if s 1 the output is equal to y.
Page 2 outline introduction multiplexers and demultiplexers. A demultiplexer is a circuit with one input and many output. The reverse of the digital demultiplexer is the digital multiplexer. As the name implies, their functions are opposite to each other similar to encoder and decoder. In a demux, we have n output lines, one input line, and m select lines.
Multiplexer with the help of control signals selects the particular input that has to be transmitted at the output. A general overview of multiplexer and demultiplexer. Demultiplexers the demultiplexer is a combinational logic circuit that performs the reverse operation of multiplexer several output lines, one input. The demultiplexer converts a serial data signal at the input to a parallel data at its output lines as shown below. Schmitt trigger action at control input makes t he circuit tolerant to slower input rise and fall times across the entire v cc range from 2. Multiplexers combinational logic functions electronics. Multiplexer demultiplexer this presentation will demonstrate the basic function of the multiplexer mux. In figure 1a shows a sumofproducts circuit that implements a 2to1 multiplexer with a select input s. Multiplexing and demultiplexing logic functions for computing. Although they appear similar, they certainly perform di. One of these data inputs will be connected to the output based on the values of selection lines. Multiplexer and demultiplexer are two devices very important in data communications.