We can implement the above two Boolean functions by using two input OR gates. Inputsįrom Truth table, we can write the Boolean functions for each output as The Truth table of 4 to 2 encoder is shown below. The block diagram of 4 to 2 Encoder is shown in the following figure.Īt any time, only one of these 4 inputs can be ‘1’ in order to get the respective binary code at the output. Let 4 to 2 Encoder has four inputs Y 3, Y 2, Y 1 & Y 0 and two outputs A 1 & A 0. It is optional to represent the enable signal in encoders. Therefore, the encoder encodes 2 n input lines with ‘n’ bits. It will produce a binary code equivalent to the input, which is active High. It has maximum of 2 n input lines and ‘n’ output lines. An Encoder is a combinational circuit that performs the reverse operation of Decoder.
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