Logic Gates

Logic gates are physical components in a circuit that control the flow of a signal by implementing a Boolean function, processing a signal to binary information. Logic gates are foundational in logic circuits, or in any electronic circuit process that involves digital to analogue signal conversion, or the flow of digital information. Logic gates are primarily implemented using diodes or transistors as electrical switches, but can also be constructed using electromagnetic relays (relay logic), vacuum tubes, optics, molecules, fluidic logic, pneumatic logic, or even mechanical elements.

Types of Logic Gate

Logic gates have distinct logic functions. The most common of these are known as basic gates. These include:

  • AND Gates - these gates have multiple inputs that are processed into a single signal output depending on the positive combination of high signals in the inputs. It will only produce a high signal if both inputs register as high (e.g. two ones will result in a one, otherwise, it will have an output of zero).
  • OR Gates - similar to the AND gate, an OR gate has multiple inputs and a single output. In this case, it does not require a positive combination of one signals but will implement logical produce a high signal if one or all of the inputs are high. (e.g a one and a zero, or two ones, may produce a high signal, but two zeros will produce zeros.)
  • NOT Gates -also known as inverters, the NOT gates will process the signal as the opposite of its value (eg. a one will invert as a zero, and a zero will invert as a 1.)

There are also combined function logic gates that modify typical functions with an inversion.

  • NAND Gate - unlike an AND gate, NAND will process two high signals as a zero and all other combinations as a one.
  • NOR Gate - unlike an OR gate, this will produce a one if the inputs register a zero signal in any combination, rather than a high signal.
  • Buffer Gate - a buffer logic gate behaves in the opposite manner of a NOT gate, in that it passes a signal unchanged from input to output.

Applications

As CPUs employ binary logic, logic gates are essentially the building blocks of computers. As such, they can be found in many kinds of digital circuits such as:

  • Encoders & Decoders
  • Multiplexers & Demultiplexers
  • Full and half adders

...
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Beskrivning Pris Logic Function Mounting Type Number of Elements Number of Inputs per Gate Schmitt Trigger Input Package Type Pin Count Logic Family Input Type Maximum Operating Supply Voltage Maximum High Level Output Current Maximum Propagation Delay Time @ Maximum CL Minimum Operating Supply Voltage Maximum Low Level Output Current
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Tillv. art.nrMC14081BDG
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AND Surface Mount 4 2 No SOIC 14 4000 - 18 V -4.2mA 100 ns @ 15 V, 130 ns @ 10 V, 300 ns @ 5 V 3 V 4.2mA
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Tillv. art.nr74LV132AS14-13
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NAND Surface Mount 4 2 Yes SOIC 14 LV Schmitt Trigger 5.5 V -12mA 11 ns @ 50 pF 2 V 12mA
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Tillv. art.nrMC74HC1G32DFT1G
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OR Surface Mount 1 2 No SC-70 5 HC CMOS 6 V -2.6mA 155ns 2 V 2.6mA
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Tillv. art.nrNL7SZ57DFT2G
VarumärkeON Semiconductor
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Multifunction Surface Mount 1 3 - SC-88 6 NL Schmitt Trigger 5.5 V -32mA 14.4ns 1.65 V 32mA
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Tillv. art.nrSN74LS08D
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AND Surface Mount 4 2 No SOIC 14 LS - 5.25 V -0.4mA 20 ns @ 5 V 4.75 V 8mA
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Tillv. art.nr74LV00PW,112
VarumärkeNexperia
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NAND Surface Mount 4 2 No TSSOP 14 LV CMOS 5.5 V -12mA 31 ns @ 15 pF 1 V 12mA
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Tillv. art.nr74ACT08SC
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4,782 kr
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AND Surface Mount 4 2 - SOIC 14 ACT - 5.5 V -24mA 10 ns @ 50 pF 4.5 V 24mA
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Tillv. art.nr74VHC03FT
VarumärkeToshiba
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NAND Surface Mount 4 2 - TSSOP 14 74VHC CMOS, TTL 5.5 V - 14.5 ns @ 50 pF 2 V 8mA
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Tillv. art.nrMM74HC08M
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AND Surface Mount - 2 - SOIC 14 HC CMOS 6 V 5.2mA 20 ns @ 15 pF 2 V 5.2mA
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Tillv. art.nrMC14011BDG
VarumärkeON Semiconductor
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NAND Surface Mount 4 2 No SOIC 14 4000 - 18 V -4.2mA 80 ns @ 15 V, 100 ns @ 10 V, 250 ns @ 5 V 3 V 4.2mA
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Tillv. art.nrCD74HCT02E
VarumärkeTexas Instruments
5,76 kr
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NOR Through Hole 4 2 No PDIP 14 HCT - 5.5 V -4mA 21 ns @ 4.5 V 4.5 V 4mA
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Tillv. art.nrMC14011BDR2G
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NAND Surface Mount 4 2 No SOIC 14 4000 - 18 V -10mA 250 ns @ 50 pF 3 V 10mA
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Tillv. art.nrMC74VHC1GT00P5T5G
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Tillv. art.nrM74HC132YTTR
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NAND Surface Mount 4 2 Yes TSSOP 14 HC Schmitt Trigger 6 V -5.2mA 160 ns @ 50 pF 2 V -5.2mA
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Tillv. art.nr74HCT10D,652
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NAND Surface Mount 3 3 No SOIC 14 HCT CMOS 6 V - 36 ns @ 4.5 V 2 V -
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OR Surface Mount 4 2 - TSSOP 14 74VHC CMOS, TTL 5.5 V -8mA 14.5 ns @ 50 pF 2 V 8mA
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XOR Surface Mount 4 2 Yes TSSOP 14 LV Schmitt Trigger 5.5 V -12mA 11 ns @ 50 pF 2 V 12mA
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OR Surface Mount 4 2 - TSSOP 14 ACT TTL 5.5 V -24mA 10 ns @ 50 pF 4.5 V 24mA
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Tillv. art.nrSN74AHCT02PWR
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NOR Surface Mount 4 2 No TSSOP 14 AHCT - 5.5 V -8mA 7.5 ns @ 5 V 4.5 V 8mA
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Tillv. art.nrNL27WZU04DFT2G
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