PPT: Basic Logic Gates | Digital Electronics - Electrical Engineering (EE) PDF Download

 Page 1


Basic Logic Gates
Page 2


Basic Logic Gates
Logic Gates
Goal:
n To understand how digital a computer can
work, at the lowest level.
n To understand what is possible and the
limitations of what is possible for a digital
computer.
Page 3


Basic Logic Gates
Logic Gates
Goal:
n To understand how digital a computer can
work, at the lowest level.
n To understand what is possible and the
limitations of what is possible for a digital
computer.
Logic Gates
All digital computers for the past 50 years have
been constructed using the same type of
components.
These components are called logic gates.
Logic gates have been implemented in many
different ways.
Currently, logic gates are most commonly
implemented using electronic VLSI transistor
logic.
Page 4


Basic Logic Gates
Logic Gates
Goal:
n To understand how digital a computer can
work, at the lowest level.
n To understand what is possible and the
limitations of what is possible for a digital
computer.
Logic Gates
All digital computers for the past 50 years have
been constructed using the same type of
components.
These components are called logic gates.
Logic gates have been implemented in many
different ways.
Currently, logic gates are most commonly
implemented using electronic VLSI transistor
logic.
Logic Gates
All basic logic gates have the ability to
accept either one or two input signals
(depending upon the type of gate) and
generate one output signal.
Page 5


Basic Logic Gates
Logic Gates
Goal:
n To understand how digital a computer can
work, at the lowest level.
n To understand what is possible and the
limitations of what is possible for a digital
computer.
Logic Gates
All digital computers for the past 50 years have
been constructed using the same type of
components.
These components are called logic gates.
Logic gates have been implemented in many
different ways.
Currently, logic gates are most commonly
implemented using electronic VLSI transistor
logic.
Logic Gates
All basic logic gates have the ability to
accept either one or two input signals
(depending upon the type of gate) and
generate one output signal.
Logic Gates
Input and Output signals are binary.
n binary:
n always in one of two possible states;
n typically treated as:
 On / Off (electrically)
 1   /  0
 True / False
There is a delay between when a change happens
at a logic gates inputs and when the output
changes, called gate switching time.
The True or False view is most useful for thinking
about the meaning of the basic logic gates.