Draw the truth table for full adder and realize using 3:8 decoder

Subject: Logic Design

Topic: Design and Analysis of Combinational Circuits

Difficulty: Medium

1 Answer

The truth table of a full adder is shown in Table1


  1. The A, B and Cin inputs are applied to 3:8 decoder as an input.
  2. The outputs of decoder m1, m2, m4 and m7 are applied to OR gate as shown in the figure to obtain the sum output.
  3. Similarly output m3, m5, m6 and m7 are applied to another OR gate to obtain the carry output.
  4. The implement of the full adder is shown in figure1.


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