ENGR 2720 Chapter 01

# ENGR 2720 Chapter 01 - ENGR 2720 Chapter 1 Basic Principles...

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1 ENGR 2720 Chapter 1 Basic Principles of Digital Systems

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2 Chapter 1 Homework 1.3(a,b&c), 1.5, 1.7, 1.9, 1.13(a&f), 1.15, 1.17(a&g), 1.18a, 1.19a, 1.21, 1.23, 1.25
3 Analog vs. Digital Analog: A way of representing a physical quantity by a proportional continuous voltage or current. Digital: A way of representing a physical quantity in discrete voltage steps.

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4 Analog Electronics Values are continuously variable between defined values. Can have any value within a defined range.
5 Analog Electronics

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6 Digital Electronics Values can vary only by distinct, or discrete, steps. Can only have two values.
7 Digital Logic Levels Logic HIGH is the higher voltage and represented by binary digit ‘1’. Logic LOW is the lower voltage and represented by binary digit ‘0’.

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8 Digital Logic Levels 0.8 V
9 Binary Number System Uses two digits, 0 and 1. Represents any number using the positional notation.

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10 Positional Notation The value of a digit depends on its placement within a number. In base 10, the positional values are (starting to the left of the decimal) – 1 (10 0 ), 10 (10 1 ), 100 (10 2 ), 1000 (10 3 ), etc. In base 2, the positional values are 1 (2 0 ), 2 (2 1 ), 4 (2 2 ), 8 (2 3 ), etc.
11 Decimal Equivalence of Binary Numbers 13 1 0 4 8 1) (1 2) 0 4) (1 8) (1 ) 2 (1 ) 2 (0 ) 2 (1 ) 2 (1 1101 0 1 2 3 = + + + = × + × + × + × = × + × + × + × = (

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12 Bit Shorthand for binary digit, a logic 0 or 1. The most significant bit (MSB) is the leftmost bit of a binary number. The least significant bit (LSB) is the rightmost bit of a binary number.
13 Binary Inputs Digital circuits operate by accepting logic levels (0,1) at their input(s). The corresponding output(s) logic level will change (0,1).

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14 Binary Inputs
Truth Table A list of output logic levels corresponding to all possible input combinations. The number of input combinations is 2

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## This note was uploaded on 04/15/2008 for the course ETEC ENGR 2720 taught by Professor Grubbs during the Spring '08 term at North Texas.

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ENGR 2720 Chapter 01 - ENGR 2720 Chapter 1 Basic Principles...

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