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Encyclopedia > OR gate

Contents


Function

INPUT OUTPUT
A B A OR B
0 0 0
0 1 1
1 0 1
1 1 1

The OR gate is a digital logic gate that behaves according to the truth table to the right. A HIGH output results if one or both the inputs to the gate are HIGH. If neither input is HIGH, a LOW output results.





Symbols

There are two symbols for OR gates: the 'military' symbol and the 'rectangular' symbol. For more information see Logic Gate Symbols A logic gate is an arrangement of controlled switches used to calculate operations using Boolean logic in digital circuits. ...

'Military' OR Symbol
'Military' OR Symbol
'Rectangular' OR Symbol
'Rectangular' OR Symbol



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


Hardware Description and Pinout

OR Gates are basic logic gates, and as such they are recognised in TTL and CMOS ICs. The standard, 4000 series, CMOS IC is the 4071, which includes four independent, two-input, OR gates. The pinout diagram is as follows: TTL is an elite band of men and boys that originate, live or are involved in the tadley bmx scene. ... Static CMOS Inverter Complementary-symmetry/metal-oxide semiconductor (CMOS) (see-moss, IPA:), is a major class of integrated circuits. ... IC or ic may stand for: -ic suffix The IATA airline designator for Indian Airlines In chatting terms, it stands for I See. Also see Internet Slang Identity card Illinois Central Railroad (AAR reporting mark IC) Immediate constituent (IC), in morphology Imperial College London - The famous science university is often...

Pinout Diagram of a 4071 Quad OR DIL-format IC
Enlarge
Pinout Diagram of a 4071 Quad OR 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. 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 OR Gate, 3- and 4-Input OR Gates are also available:

  • 4075: Triple 3-Input OR Gate
  • 4072: Dual 4-Input OR Gate

Alternatives

If no specific OR gates are available, one can be made from NAND gates in the configuration shown below. Interestingly, any logic gate can be made from a combination of NAND gates NAND gates have the property, along with NOR gates, to be able to be combined to form any other kind of logic gate. ...

OR Gate Constructed Using Only NAND Gates
OR Gate Constructed Using Only NAND Gates

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