Question
Download Solution PDFFor a binary half subtractor having two inputs A and B, the correct set of logical expressions for the outputs D (difference) and X (borrow) is
This question was previously asked in
UPSC ESE (Prelims) Electronics and Telecommunication Engineering 19 Feb 2023 Official Paper
Answer (Detailed Solution Below)
Option 3 : D = A̅B + AB̅, X = A̅B
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ST 1: UPSC ESE (IES) Civil - Building Materials
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Detailed Solution
Download Solution PDFThe correct option is 3
Concept:
Truth Table for half subtractor:
| A | B | Difference | Borrow |
|---|---|---|---|
| 0 | 0 | 0 | 0 |
| 0 | 1 | 1 | 1 |
| 1 | 0 | 1 | 0 |
| 1 | 1 | 0 | 0 |
\( Difference = A⊕B = A\bar B + \bar AB \)
\(Borrow = X=\bar AB\)
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