DemultiplexerPublished on 24/2/2012 & updated on 9/8/2018
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Since, the need of package count is least for demultiplexer. The function of this circuit is the reverse of the multiplexer.
The pin diagram of demultiplexer is in figure below.
1 to 4 DemultiplexerNow, we can select a 1 to 4 Demultiplexer. There are many other types like 1-to-2, 1-to-8, 1-to-16 demultiplexers etc. The details of this type are the following:
- Input 1 input bit is present. Here it is Data D.
- Outputs The number of outputs is four. They are Y0, Y1, Y2 and Y3.
- Control Bits Two control bits are used here. They are A and B. The input data bit is send to the data bit of the output lines depending on the value of the select input or control bit.
When the input is set as 0, Y1 will be low that is 0 and when input is 1 (high), Y1 will be 1(high). Thus, we can say that the Y1 value will directly depend on input D. The other three outputs are 0 (low state).
If the condition AB = 10, every other AND gates are disabled excluding the second AND gate from the bottom. So, input bit D is sent to Y2 output. Thus, Y2 = Data D. Truth Table
Applications of DemultiplexerDemultiplexers are implemented in several fields where there is a necessity of connecting single source to several destinations.
Communication System of DemultiplexerGenerally the communication system includes transmission and reception of the signals. For these purposes, the multiplexer in the transmitting end and the demultiplexer in the receiving end have to work simultaneously. Transmission is done with the implementation of multiplexer. The output of the multiplexer; which is the single output and it is given as the input of the demultiplexer. The demultiplexer in the receiver will change this given input to the original signals.
Arithmetic and Logic Unit (ALU) of DemultiplexerWith the implementation of demultiplexer, the output of the ALU can keep in storage units or multiple registers. Here, the ALU output is given to the demultiplexer as its input. The outputs of the demultiplexer are given to the multiple registers where the data is stored.
Serial to Parallel Converter of DemultiplexerThis converter can give (recreate) the parallel data from the received serial data. Here, the input serial data is set as the input of demultiplexer. This is done at regular intervals. At the control input of demultiplexer, a counter is attached. The data signal is directed to the demultiplexer output with the help of this counter. After every bit of data signals is stored, the demultiplexer output can be extracted. It can be read out in parallel.
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