Half Subtractor.pptx

This PPT explains Half Subtractor

1. HALF SUBTRACTOR III PHYSICS – 10.03.2022 Dr.R.Hepzi Pramila Devamani, Assistant Professor of Physics, V.V.Vanniaperumal College for Women, Virudhunagar.

2. Half Subtractor The half subtractor is a combinational circuit which is used to perform subtraction of two bits. It has two inputs X (minuend) and Y (subtrahend) and two outputs D(difference) and Bout (borrow out). The symbol and truth table for half subtractor is shown in figure. The difference output is 0 if X = Y and 1 if X ≠ Y. The borrow output Bout is 1 whenever X is less than Y, then subtraction is done by borrowing 1 from the next higher order bit.

3. Half Subtractor

4. Half Subtractor The Boolean expression for difference (D) and borrow out (Bout) can be written as

5. Full Subtractor The full subtractor is a combinational circuit which is used to perform subtraction involving three bits. It has two inputs X (minuend) and Y (subtrahend) and the borrow from the previous stage and two outputs D(difference) and Bout (borrow out). The symbol and truth table for half subtractor is shown in figure . The full subtractor can be implemented using two subtractors and an OR gate shown in figure.

6. Full Subtractor

7. Full Subtractor

8. Full Subtractor

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