![]() If enable is zero, afterward all the decoder’s outputs will be equivalent to zero. Thus, this decoder’s output is nothing but the minterms of inputs and enable is equivalent to 1. The 2 to 4 decoder logic diagram is shown below. So the four product terms can be implemented through 4 AND gates where each gate includes 3 inputs as well as 2 inverters. The boolean expression for every output isĮvery output of this decoder includes one product term. The main difference between a decoder and a demultiplexer is a combinational circuit that is used to allow only one input as well as direct it into one of the outputs, whereas a decoder allows several inputs and generates the decoded output. ![]() The main function of a decoder is to change a code into a set of signals because it is opposite to an encoder, but the designing decoders is simple. The circuit shows the 1 to 2 demultiplexer schematic. The below is the truth table for 1 to 2 demultiplexer with “I” as input data, D0 and D1 are the output data line and A is the selection line. A decoder is used to select among many devices whereas a demultiplexer is used to send the signal to many devices. DemuxĭEMUX is used when the circuit wishes to send the data signal to one of the many devices. A DEMUX gives ‘2n’ outputs for ‘n’ selection lines with a single input. A DEMUX converts the input serial data line into output parallel data. It is also called as a DEMUX or a data distributor. ![]() It is the reverse process of a multiplexer. A demultiplexer takes one single input data and then selects any one of the single output lines one at a time. 1 to 2 Decoder CircuitĪ demultiplexer is a device that takes a single input and gives one of the several output lines. The circuit shows the 1 to 2 decoder logic.
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