Electronics Tutorials Home Page


Valid XHTML Web Page

Do you like our Site?
Help us to Share It

Bookmark to: Google Bookmark to: Yahoo Bookmark to: Digg Bookmark to: Del.icio.us Bookmark to: Technorati
Bookmark to: Facebook Bookmark to: Reddit Bookmark to: StumbleUpon Bookmark to: Slashdot Bookmark to: Newsvine
Bookmark to: Propeller Bookmark to: Blinklist Bookmark to: Simpy


Electronics Tutorial about the Logic NOT Function
 

The Logic NOT Function

Navigation
Page: 3 of 7

The Logic NOT Function

The Logic NOT Function is simply a single input inverter that changes the input of a logic level "1" to an output of logic level "0" and vice versa. It is generally denoted by a bar or overline ( ¯ ) over its input symbol which denotes the inversion operation. As NOT gates perform the logic INVERT or COMPLEMENTATION function they are more commonly known as Inverters. In logic circuits this negation can be represented by a normally closed switch.

Switch Representation of the NOT Function


logic not gate

If A means that the switch is closed, then NOT A or simply A says that the switch is NOT closed or in other words, it is open.

Truth Table


Switch Output
10
01
Boolean ExpressionA or A
 
inverter

NOT gates or Inverters can be used with standard AND and OR gates to produce NAND and NOR gates. Inverters can also be used to produce "Complementary" signals in more complex decoder/logic circuits for example, the complement of logic A is A.

When designing logic circuits and you need only one or two inverters, but do not have the space or the money for a dedicated Inverter chip such as the 74LS04, you can easily make inverter functions using any spare NAND or NOR gates by simply connecting their inputs together as shown below.

NAND or NOR Gate Inverter

Goto Page:  1 2 3 4 5 6 7

 External Links about Boolean Algebra NOT Function  
DM74ALS04B Datasheet - DM74ALS04B 6-independent Gates HEX Inverter Datasheet.
 Fairchild Semiconductor
NOT Function - Tutorial Explaining the NOT Gate Function.
 University of Sydney - School of Electrical and Information Engineering
NOT Gate - Basic Tutorial about the NOT Gate.
 Tennessee Tech University - Dept. of Computer Science
Logical NOT Operator - Tutorial about the NOT Operator.
 XCProd Website

Link to us : 
Add this Boolean NOT Function Tutorial to your Favourites

Advertisement


Page Designed and Written by Wayne Storr.   Last updated  ,
Copyright © 1998 − 2010, Electronics-Tutorials.ws, All Right Reserved.