Logic Diagram Of 3 To 8 Decoder

S0 s1 and s2 are three different inputs and d0 d1 d2 d3. Let us see diagram of 3 8 decoder which decodes a 3 bit information and there is only one output line which gets the value 1 or in other words out of 2 3 8 lines only 1 output line is selected. Using the above expressions the circuit of a 3 to 8 decoder can be implemented using three not gates and eight 3 input and gates as shown in fig 1.

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3 to 8 line decoder has a memory of 8 stages.

Logic diagram of 3 to 8 decoder. The circuit is designed with and and nand combinations. The complement of input a3 is connected to enable e of lower 3 to 8 decoder in order to get the outputs y 7 to y 0. In the below diagram given input represented as i2 i1 and i0 all. This decoder circuit gives 8 logic outputs for 3 inputs.

3 to 8 line decoder block diagram. The parallel inputs a 2 a 1 a 0 are applied to each 3 to 8 decoder. Description of each and every pin in 74138. Decoder converts one type of coded information to another form.

Pin diagram of 3 8 decoder. 3 to 8 decoder logic diagram the logical diagram of the 3 8 line decoder is given below. Why 74138 has 3 enable pins is also discussed. Mumbai university comps sem 3 digital logic design and analysis.

It takes 3 binary inputs and activates one of the eight outputs. How to implement boolean functions using decoder is also explained. Truth table of 3 to 8 decoder. 3 to 8 decoder with truth table and logic gates we know possible outputs for 3 inputs so construct 3 to 8 decoder having 3 input lines a enable input and 8 output lines.

A decoder has n inputs and an enable line a sort of selection line and 2 n output lines. The decoder circuit works only when the enable pin e is high. The block diagram of 4 to 16 decoder using 3 to 8 decoders is shown in the following figure. The three inputs a b and c are decoded into eight outputs each output representing one of the midterms of the 3 input variables.

D7 are the eight outputs. It is convenient to use an and gate as the basic decoding element for the output because it produces a high or logic 1 output only when all of its inputs are logic 1. Decoder block diagram 3 to 8 decoder.