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The Info List - AND Gate



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The AND GATE is a basic 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. In another sense, the function of AND effectively finds the _minimum_ between two binary digits, just as the OR function finds the _maximum_ between two binary digits. Therefore, the output is always 0, except when all the inputs are 1.

CONTENTS

* 1 Symbols

* 2 Implementations

* 2.1 Alternatives

* 3 IC package * 4 See also * 5 References

SYMBOLS

There are three symbols for AND gates: the American (ANSI or 'military') symbol and the IEC ('European' or 'rectangular') symbol, as well as the deprecated DIN symbol. For more information see Logic Gate Symbols .

_

MIL/ANSI Symbol_ _IEC Symbol_ _DIN Symbol_

The AND gate with inputs _A_ and _B_ and output _C_ implements the logical expression C = A B {displaystyle C=Acdot B} .

IMPLEMENTATIONS

AND gate using diodes AND gate using transistors NMOS AND gate

An AND gate is usually designed using N-channel (pictured) or P-channel MOSFETs . 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," meaning that they can be used to make all the others.

DESIRED GATE NAND CONSTRUCTION NOR CONSTRUCTION

IC PACKAGE

AND gates are available in IC packages. 7408 IC is a famous QUAD 2-Input AND GATES and contains four independent gates each of which performs the logic AND function. IC 7408

SEE ALSO

_ Wikimedia Commons has media related to AND GATES _.

* OR gate * NOT gate * NAND gate * N OR gate * X OR gate * XN OR gate * IMPLY gate * Boolean algebra * Logic gate

* v * t * e

Logical connectives

* Tautology {displaystyle top }

* NAND {displaystyle uparrow } * Converse implication {displaystyle leftarrow } * Implication {displaystyle rightarrow } * OR {displaystyle lor }

* Negation {displaystyle neg } * XOR {displaystyle oplus } * Biconditional {displaystyle leftrightarrow } * Statement

* NOR {displaystyle downarrow } * Nonimplication {displaystyle nrightarrow } * Converse nonimplication {displaystyle nleftarrow } * AND {displaystyle land }

* Contradiction {displaystyle bot }

REFERENCES

* ^ Mano, M. Morris and Charles R. Kime. _Logic and Computer Design Fundamentals, Third Edition._ Prentice Hall, 2004. p. 73.

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