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Beginner Combinational Circuits 7 composants

Half Subtractor

Subtracts one bit from another, producing a Difference bit and a Borrow bit. The complement of the half adder.

Fig. 1 — Half Subtractor INTERACTIVE
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Ce que tu apprendras

  • Derive Difference and Borrow from a truth table
  • Contrast the half subtractor with the half adder
  • Identify when a borrow is generated

Comment ça fonctionne

The Difference output is A XOR B; the Borrow output is high only when A=0 and B=1 (you can't take 1 from 0 without borrowing). It is the subtraction counterpart of the half adder.

Composants utilisés

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Applications concrètes

The least-significant stage of any subtractor, and a building block for ALUs and calculators.