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A Profession Univers Unit 1: Review of Basics of Digital Electronics

Notes
Unit 1: Review of Basics of Digital Electronics

CONTENTS
Objectives
Introduction
1.1 Codes in Digital Electronics
1.1.1 Classification of Binary Codes
1.2 Logic Gates
1.3 Summary
1.4 Keywords
1.5 Self Assessment
1.6 Review Questions

1.7 Further Readings
Objectives

After studying this unit, you will be able to:
• Discuss the codes in digital electronics
• List the functions of different logic gates
• Discuss the truth table for all the logic gates
Introduction

Digital electronics is a field of computer science. It deals with devices that are used to carry out
computer applications.
In digital electronics, we use two-state or binary logic. The two logic states are “0” (low) and “1”
(high).
Computer uses binary number system for its operations. Digital electronics represents the two
binary numbers, 1 and 0, using two voltage levels in a device called a logic gate. Sometimes the
two states can also be represented using Boolean logic functions, “true” or “false” states, or using
an “on” or “off” state.
Logic gates are important components of a digital circuit. A logic gate takes two inputs and
generates a single output. In this unit we will discuss about the basic logic gates and their
corresponding truth tables.
1.1 Codes in Digital Electronics
Basically, digital data is represented, stored, and transmitted as groups of binary digits which are
called bits. The group of bits is known as binary code. Binary codes are used in computers as they
allow computers to perform complex calculations quickly and efficiently. Binary codes are used
in financial, commercial, and industrial applications. To understand how binary codes are applied
in these fields, we first have to understand the classification of binary codes.
1.1.1 Classification of Binary Codes
Binary codes can be represented as numbers and letters of the alphabets as well as many special
characters and control functions. They are classified as numeric or alphanumeric codes. Numeric
codes are used to represent numbers, whereas alphanumeric codes are used to represent alphabetic
letters and numerals.

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