Decoders:- Decoders are another type of Digital Logic device that has inputs of 2-bit, 3-bit or 4-bit codes depending upon
the number of data input lines, so a decoder that has a set of two or more bits will be defined as having an n-bit
code, and therefore it will be possible to represent 2n possible values. Thus, a decoder generally decodes a
binary value into a non-binary one by setting exactly one of its n outputs to logic “1”.
A 2 to 4 line Decoder:-In this circuit the two input lines can be set to any one of four binary values, 00, 01, 10 or 11. Resulting from this
input, the output line corresponding to the binary value at inputs A and B changes to logic 1. The other output
lines remain at logic 0. Circuit Diagram:-