A multiplexer or mux is a device that has many inputs and a single output. Often referred to as a decoderdemultiplexer selection data input. Trinary encoder, decoder, multiplexer and demultiplexer using. By setting the input to true, the demux behaves as a decoder. Page 2 outline introduction multiplexers and demultiplexers. Request pdf trinary encoder, decoder, multiplexer and demultiplexer using savart plate and spatial light modulator optoelectronic processors have already been developed with the strong. Trinary encoder, decoder, multiplexer and demultiplexer.
It uses all and gates, and therefore, the outputs are active high. 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. Encoder adalah rangkaian yang memiliki fungsi berkebalikan dengan dekoder. Another key difference exists for mux and demux is that multiplexer is n to 1.
On the contrary, demultiplexer utilizes the control signal and allows us to have multiple outputs. Whereas a multiplexer or mux is a device which performs multiplexing or it takes information from more than one channels and outputs into a single channel. An encoder is the combinational circuit which performs a reverse function that of decoder. Multiplexing is defined as the process of feeding several independent signals to a common load, one at a time. The relation between the number of output lines and the number of select lines is the same as we saw in a.
Demultiplexer atau sering disingkat demux adalah rangkaian rangkain yang digunakan untuk memperbanyak jumlah outputkeluaran. It decodes four binary weighted address inputs a0 to a3 to sixteen mutually exclusive outputs y0 to y15. The 748 with three enable inputs has a flexible enabling system. A decoder performs the reverse function of an encoder. Pengertian multiplexer, demultiplexer, decoder dan encoder. The meaning of this is that any function of the selection bits can be constructed through logically orring the correct set of outputs. Encoders if the a decoders output code has fewer bits than the input code, the device is usually called an encoder. Encoder berfungsi sebagai rangakain untuk mengkodekan data input mejadi data bilangan dengan format tertentu. Multiplexer with the help of control signals selects the particular input that has to be transmitted at the output. Pada silabus sistem komputer tkj kurikulum 20 untuk kelas x terdapat materi multiplexer dan decoder, sebelum kita membahas pengertian dua materi tersebut, sebaiknya kita mengingat kembali bahwa manusia terbiasa menggunakan basis bilangan sepuluh decima yang sering kita sebut bilangan desimal, sedangkan komputer hanya mengerti bilangan digital yaitu biner, oktal. The demultiplexer is the inverse of the multiplexer, in that it takes a data input and n address inputs. In analog applications, multiplexers are made up of of. Combine two or more small decoders with enable inputs to form a larger decoder e.
Function of decoder and a demultiplexer decoder is the inverse function of an encoder, which is to translate coded digital input signals into equivalent coded output signals. 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. Doc laporan multiplexer dan demultiplexer wandha kartika. The multiplexer is used to perform highspeed switching and is constructed by electronic components multiplexers are capable of handling both analog and digital applications. Write short notes on a decoder b encoder c multiplexer. The simplest encoder is a 2nton binary encoder, where it has only one of 2n inputs 1 and the output is the nbit binary number corresponding to the active input. Some of the characteristics of combinational circuits are following the output of combinational circuit at any. Decoder demultiplexer decoders encoders product list at newark. Decoder demultiplexer decoders encoders farnell uk. Demultiplexers can be used to implement general purpose logic. An encoder refers to a device that is used to change a signal or data into a code.
Multiplexers and demultiplexers are often confused with one another by students. Design and simulation of decoders, encoders, multiplexer and. Using an noutput decoder use an noutput decoder to realize a logic circuit for a function with n minterms. A common example of a decoder demultiplexer ic is the 74ls148, which is a lowpower schottky ttl device that has 8 input lines and 3 output lines. In terms of d 5 construct the implementation of 18 demultiplexer. Every output will be low unless e1 and e2 are low and. The device inputs are compatible with standard cmos outputs. 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. A typical example of a 3to8 line decoderdemultiplexer, the 748, is shown in figure 5. Multiplexer and demultiplexer are two devices very important in data communications.
What is the difference between an encoderdecoder and a. Competitive prices from the leading 2to4 line decoder demultiplexer decoders encoders distributor. Design and simulation of decoders, encoders, multiplexer. An encoder, is a digital device that receives digitsdecimal, octal, etc. Each minterm of the function can be mapped to an output of the decoder. Sep 20, 2014 pada silabus sistem komputer tkj kurikulum 20 untuk kelas x terdapat materi multiplexer dan decoder, sebelum kita membahas pengertian dua materi tersebut, sebaiknya kita mengingat kembali bahwa manusia terbiasa menggunakan basis bilangan sepuluh decima yang sering kita sebut bilangan desimal, sedangkan komputer hanya mengerti bilangan digital yaitu biner, oktal dan hexadesimal. A multiplexer is a circuit used to select and route any one of the several input signals to a signal. Multiplexer is a combinational circuit that has maximum of 2 n data inputs, n selection lines and single output line. If the package is to be used as a demultiplexer then input lines g2a and g2b can be grounded and g1 can be used as the input line for data. Gate cmos the mc74hc9a is identical in pinout to the ls9. While on the music system, the selection of the input is made manually, the multiplexer chooses its input based on a binary number, the address input. A high on either of the input enables forces the outputs high. Gate cmos the mc74hc238a is identical in pinout to the ls238. Competitive prices from the leading decoder demultiplexer decoders encoders distributor.
Multiplexer and demultiplexer circuits and apllications. Since there are n selection lines, there will be 2 n possible combinations of zeros and ones. The device can be used as a 1to16 demultiplexer by. The single pole multiposition switch is a simple example of nonelectronic circuit of multiplexer, and it is widely used in many electronic circuits. A typical example of a 3to8 line decoder demultiplexer, the 748, is shown in figure 5. 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. Shown here is a multiplexer and a demultiplexer, each using a multipleposition switch symbol to indicate the selection functions inside the respective circuits. An encoder is a device which converts information from one format or code to other format or code. The decimal to bcd encoder has 10 inputs, one representing each decimal digit and four outputs. Apr 20, 2010 a multiplexer, selects one at an instance from a number of input signals. A multiplexer, selects one at an instance from a number of input signals. An encoder performs the inverse function of a decoder. Generally multiplexer and demultiplexer are used together, because of the communication systems are bi directional. Pdf makalah multiplexer dan demultiplexer nam mohamad.
Combinational circuits i adders, decoders, multiplexers cc. On the contrary, the decoder is a combinational circuit which can accept many inputs and generate the decoded output. The device features three enable inputs e1 and e2 and e3. Difference between demultiplexer and decoder with comparison. For each row in the truth table, for the function, where the output is 1, sum or or the corresponding outputs of the decoder. Mux directs one of the inputs to its output line by using a control bit word. Difference between multiplexer and demultiplexer with. The device features two input enable e0 and e1 inputs. One of these data inputs will be connected to the output based on the values of selection lines. These devices are used for sharing a device between two or more applications. An encoder is a digital circuit that performs the inverse operation of a decoder.
Demultiplexer, on the other hand, does exactly the opposite of what a multiplexer does, which is to consolidate several data streams into a single stream of media or. 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. Demultiplexer atau dapat disingkat demux merupakan suatu rangkaian elektronika yang mempunyai output dua atau lebih dan hanya mempunyai satu input jumlah input dapat bergantung dari jumlah keluarannya, didalam multiplexer terdapat suatu pemilih keluaranoutputnya, jadi demultiplexer merupakan rangkaian yang dapat dipilih outputnya untuk meneruskan data dari inputnya. 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. In a demux, we have n output lines, one input line, and m select lines. 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 relation between the number of output lines and the number of select lines is the same as we saw in a multiplexer. Q 1 consider the multiplexer based logic circuit shown in the figure. Decoder demultiplexer decoders encoders at farnell. Multiplexer logic and symbol, decoders logic and symbol, logic function implementation using a multiplexer. So, each combination will select only one data input.
Inputs outputs 1 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1. What is the difference between encoder and multiplexer. A demultiplexer is a combinational logic circuit that performs the opposite function as that of a multiplexer. As the name implies, their functions are opposite to each other similar to encoder and decoder. A demultiplexer, is just reverse of multiplexer which splits up multiplexed signal into several streams. The main difference between demultiplexer and decoder is that a demultiplexer is a combinational circuit which accepts only one input and directs it into one of the several outputs. A multiplexer has multiple signal inputs, one control input, and one output. Sep, 2011 multiplexer logic and symbol, decoders logic and symbol, logic function implementation using a multiplexer. Another key difference exists for mux and demux is that multiplexer is n to 1 device but demultiplexer is 1 to n device.
Demux basics of demultiplexer and designing a 3x8 decoder using multiple 2x4 demultiplexers. If a multiplexer or encoder has n output lines, then it has 2 n input lines. Encode inputs are decimal digits and or alphabetic characters and outputs are coded representation of these inputs. Decoder with enable input can function as demultiplexer. The reverse of the digital demultiplexer is the digital multiplexer. An encoder has or fewer input lines and output lines. There is one data input, whose value appears on one of the data outputs, depending on the value. Decoders, encoders, multiplexers, demultiplexers implementing. Oct 30, 2015 demux basics of demultiplexer and designing a 3x8 decoder using multiple 2x4 demultiplexers. Difference between decoder and demultiplexer difference.