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Encyclopedia > AND gate

Media:Example.ogg{| class="wikitable" align=right |- bgcolor="#ddeeff" align="center" |colspan=2|INPUT || OUTPUT |- bgcolor="#ddeeff" align="center" | A || B || A AND B |- bgcolor="#ddffdd" align="center" |0 || 0 || 0 |- bgcolor="#dffff0000d" align="center" |0 || 1 || 0 |- bgcolor="#dde4000" align="center" |1 || 0 || 0 |- bgcolor="#ddf0000" align="center" |1 || 1 || 1 |}


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. A logic gate performs a logical operation on one or more logic inputs and produces a single logic output. ... AND Logic Gate In logic and mathematics, logical conjunction (usual symbol and) is a two-place logical operation that results in a value of true if both of its operands are true, otherwise a value of false. ...

Contents

Symbols

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 Symbolshi A logic gate performs a logical operation on one or more logic inputs and produces a single logic output. ...

'Military' AND Symbol
'Military' AND Symbol
'Rectangular' AND Symbol
'Rectangular' AND Symbol


Image File history File links And. ... Image File history File links And. ... Image File history File links IEC_AND.gif Summary Made in Smartdraw Licensing I, the creator of this work, hereby release it into the public domain. ...


Hardware Description and Pinout

AND Gates are basic logic gates, and as such they are recognised in TTL and CMOS ICs. The standard, 4000 series, CMOS IC is the 4081, which includes four independent, two-input, AND gates. The pinout diagram is as follows: A Motorola 68000-based computer with various TTL chips. ... Static CMOS Inverter Complementary-symmetry/metal-oxide semiconductor (CMOS) (see-moss, IPA:), is a major class of integrated circuits. ... Integrated circuit showing memory blocks, logic and input/output pads around the periphery A monolithic integrated circuit (also known as IC, microchip, silicon chip, computer chip or chip) is a miniaturized electronic circuit (consisting mainly of semiconductor devices, as well as passive components) that has been manufactured in the surface...

Pinout Diagram of a 4081 Quad AND DIL-format IC
Pinout Diagram of a 4081 Quad AND DIL-format IC
 1 Input A1 2 Input B1 3 Output Q1 4 Output Q2 5 Input B2 6 Input A2 7 Vss 8 Input A3 9 Input B3 10 Output Q3 11 Output Q4 12 Input B4 13 Input A4 14 Vdd 

This device is available from most semiconductor manufacturers such as Philips. It is usually available in both through-hole DIL and SOIC format. Datasheets are readily available in most Datasheet Databases. Image File history File links AND_Pinout. ... Image File history File links AND_Pinout. ... IC in a DIP14-Package In microelectronics, a dual in-line package (DIP), sometimes called a DIL package, is an electronic device package with a rectangular housing and a row of electrical connecting pins along each of two opposite sides, usually the longer sides of the rectangle. ... IC in a DIP14-Package In microelectronics, a dual in-line package (DIP), sometimes called a DIL package, is an electronic device package with a rectangular housing and a row of electrical connecting pins along each of two opposite sides, usually the longer sides of the rectangle. ... Small-Outline Integrated Circuit. ... A datasheet is a document summarizing the performance and other characteristics of a component (e. ...


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

Image:NMOS_AND.png Image:PMOS_AND.png 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

AND Gate Constructed Using Only NAND Gates
AND Gate Constructed Using Only NAND Gates

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"[1] which 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. Image File history File links NMOS_AND.png‎ NMOS AND gate I, the creator of this work, hereby grant the permission to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1. ... Image File history File links PMOS_AND.png‎ PMOS AND gate I, the creator of this work, hereby grant the permission to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1. ... The metal-oxide-semiconductor field-effect transistor (MOSFET, MOS-FET, or MOS FET), is by far the most common field-effect transistor in both digital and analog circuits. ... Image File history File links AND_from_NAND.svg‎ File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): AND gate Image:AND Using NAND.jpg Image:AND Using NAND.png ...

See also

// Function The OR gate is a digital logic gate that behaves according to the truth table to the right. ... The NOT gate is a digital logic gate that behaves according to the truth table to the right. ... // Function The NAND gate is a digital logic gate that behaves according to the truth table to the right. ... // Function The NOR gate is a digital logic gate that behaves according to the truth table to the right. ... In abstract algebra, a Boolean algebra is an algebraic structure (a collection of elements and operations on them obeying defining axioms) that captures essential properties of both set operations and logic operations. ... A logic gate is an arrangement of electronically-controlled switches used to calculate operations in Boolean algebra. ...

References

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

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