2:4 Decoder. A decoder is a combinational logic circuit that has 'n' input signal lines and 2 n output lines. In the 2:4 decoder, we have 2 input lines and 4 output lines. In addition, we provide 'enable' to the input to ensure the decoder is functioning whenever enable is 1 and it is turned off when enable is 0. The truth table, logic.. Step 1. Now we know possible outputs for 2 inputs, so construct 2 to 4 decoder , having 2 input lines, a enable input and 4 output lines. In the below diagram, given input represented as I 1 and I 0 , all possible outputs named as O 0, O 1, O 2, & O 3 and a E were represented by Enable input.
The functional block diagram of the 2 to 4 decoder is shown in Figure-2. When this decoder is enabled with the help of enable input E, then its one of the four outputs will be active for each combination of inputs. The operation of this 2-line to 4-line decoder can be analyzed with the help of its truth table which is given below.. 2:4 Decoder [Detailed Explanation with logic expression and logic circuit diagram]Digital Electronic Circuit -DecoderYou can watch my all other videos here-h.