Half subtractor.

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Half subtractor is a combinational logic circuit. It is used for the purpose of subtracting two signal bit numbers. It has two inputs(A & B) & two outputs  difference (D) & borrow (b).
Half subtractor.

Boolean expressions are
D=AB'+A'B    (i.e D is the XOR of A & B)
b=A'B.   (i.e b is the AND of A' & B)

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