Digital Logic Design - Research Article from Macmillan Science Library: Computer Sciences

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Gates

Gates are used to regulate electronic flow and to construct devices to process data, as well as to build memory devices. There are three fundamental gates—"And," "Or," and "Not"—as well as some "hybrid" gates such as "Nand" (Not-And) and "Nor" (Not-Or).

Not

Consider the logical statement: "The porch light is on (Z 1) when I am not home (A 0)." Z is the output; A is the input (I am home). A corresponding binary function, of one variable, which is also binary, is called "Complement" or "Not." "Not" is represented by "Z ~A" and its behavior is:

A Not-A (Z)
0 1 1 0

The electronic implementation of Not is the inverter, a one-transistor current amplifier with one input and one output. A high (binary-1) input voltage, typically about 5 Volts, forces current into the amplifier's input. So, the amplifier draws current from its output, pulling its output voltage...

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This section contains 1,492 words
(approx. 5 pages at 300 words per page)
Buy the Digital Logic Design Encyclopedia Article
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Macmillan Science Library: Computer Sciences
Digital Logic Design from Macmillan Science Library: Computer Sciences. Copyright © 2001-2006 by Macmillan Reference USA, an imprint of the Gale Group. All rights reserved.
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