Half subtractors

Table of contents

  1. Introduction
  2. Truth table
  3. Circuit diagram
  4. Half subtractor from universal gates

Introduction

Half subtractor is a combination circuit with two inputs and two outputs (difference and borrow). It produces the difference between the two binary bits at the input and also produces an output (Borrow) to indicate if a 1 has been borrowed. In the subtraction (A-B), A is called a Minuend bit and B is called a Subtrahend bit.

Truth table

Circuit diagram

Half subtractor from universal gates