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Full-Subtractor

Date: 29 Apr 2015

Full subtractor is a combinational circuit capable of performing subtraction on two bits namely minuend and subtrahend. It accepts three inputs: minuend, subtrahend and a borrow bit. It produces two outputs: difference and borrow. The borrow output tells whether the minuend bit needs to borrow a binary bit 1 from the next higher minuend bit or not.

Graphic symbol of full-subtractor

Graphic symbol of full-subtractor

Inputs Outputs
A B Bin BD Bout
0 0 0 0 0
0 0 1 1 1
0 1 0 1 1
0 1 1 0 1
1 0 0 1 0
1 0 1 0 0
1 1 0 0 0
1 1 1 1 1
Truth table for full-subtractor