﻿

# AND gate

The AND gate is a digital logic gate that implements logical conjunction - it behaves according to the truth table to the right. A HIGH output (1) results only if both the inputs to the AND gate are HIGH (1). If neither or only one input to the AND gate is HIGH, a LOW output results.

ymbols

There are two symbols for AND gates: the 'military' symbol and the 'rectangular' symbol. These are also known as the 'American' and 'British' symbols. For more information see logic gate symbols

Equation:- output(C) = i/p(A)+ i/p(B).

Hardware description and pinout

AND Gates are basic logic gates, and are implemented in both TTL and CMOS technology ICs. The '4000 series' CMOS IC AND gate device is designated the 4081, which includes four independent, two-input, AND gates.

This d

As well as the standard 2-Input AND Gate, 3-, 4- and 8-Input AND Gates are also available:

* 4073: Triple 3-Input AND Gate
* 4082: Dual 4-Input AND Gate
* An 8-Input NAND Gate exists (4068), and this is easily made into an 8-Input AND gate by inversion of the output.

Implementations

An AND gate is usually designed using NMOS or PMOS MOSFETs as shown in the schematics to the left. The digital inputs a and b cause the output F to have the same result as the AND function.

Alternatives

If no specific AND gates are available, one can be made from NAND or NOR gates, because NAND and NOR gates are considered the "universal gates," [Mano, M. Morris and Charles R. Kime. "Logic and Computer Design Fundamentals, Third Edition." Prentice Hall, 2004. p. 73.] meaning that they can be used to make all the others. The configuration shown on the right shows how to use NAND gates to create the effect of an AND gate.

*OR gate
*NOT gate
*NAND gate
*NOR gate
*XOR gate
*Boolean algebra (logic)
*Logic gates

References

Wikimedia Foundation. 2010.

### Look at other dictionaries:

• And Gate —   [dt. »Und Gatter«], Gatter …   Universal-Lexikon

• AND-Gate —   [ ændgeɪt], Digitaltechnik, Informatik: englische Bezeichnung für das UND Glied …   Universal-Lexikon

• AND gate — loginis IR elementas statusas T sritis automatika atitikmenys: angl. AND gate; AND logic element vok. logisches UND Gatter, n; logisches UND Glied, n rus. логический элемент И, m pranc. élément de logique ET, m; élément ET, m; porte ET, m ryšiai …   Automatikos terminų žodynas

• AND gate — noun a circuit in a computer that fires only when all of its inputs fire • Syn: ↑and circuit • Hypernyms: ↑gate, ↑logic gate …   Useful english dictionary

• AND-AND gate — loginis konjunkcijų elementas statusas T sritis automatika atitikmenys: angl. AND AND gate; AND to AND gate vok. UND UND Gatter, n rus. вентиль И И, m pranc. circuit ET, m; porte ET, f …   Automatikos terminų žodynas

• AND-to-AND gate — loginis konjunkcijų elementas statusas T sritis automatika atitikmenys: angl. AND AND gate; AND to AND gate vok. UND UND Gatter, n rus. вентиль И И, m pranc. circuit ET, m; porte ET, f …   Automatikos terminų žodynas

• Negated AND gate — This article is about NAND in the sense of an electronic logic gate. For NAND in the purely logical sense, see Sheffer stroke. For other uses of NAND or Nand, see Nand (disambiguation). INPUT A   B OUTPUT A NAND B 0 0 1 0 1 1 1 0 …   Wikipedia

• NOT-AND gate — loginis IR NE elementas statusas T sritis automatika atitikmenys: angl. NAND gate; negative AND gate; NOT AND gate vok. logisches NAND Gatter, n rus. логический элемент И НЕ, m pranc. élément ET NON, m; porte ET NON, f ryšiai: sinonimas – loginis …   Automatikos terminų žodynas

• negative AND gate — loginis IR NE elementas statusas T sritis automatika atitikmenys: angl. NAND gate; negative AND gate; NOT AND gate vok. logisches NAND Gatter, n rus. логический элемент И НЕ, m pranc. élément ET NON, m; porte ET NON, f ryšiai: sinonimas – loginis …   Automatikos terminų žodynas

• Cow and Gate™ — [Cow and Gate] a company producing milk products and food for babies …   Useful english dictionary