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
RS-artikelnummer 171-3153
Tillv. art.nrTC7WZ86FK
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0,66 kr
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XOR Surface Mount 2 2 - SOT-765 8 - CMOS 5.5 V -32mA 13.5 ns @ 15 pF 1.65 V 32mA
Nytt
RS-artikelnummer 213-8990
Tillv. art.nr74LVC1G04QW5-7
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0,89 kr
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Inverter Surface Mount 1 1 No SOT25 5 - - - - - - -
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Tillv. art.nr74LVC1G34QW5-7
VarumärkeDiodesZetex
0,64 kr
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Buffer Surface Mount 1 1 No SOT25 5 - - - - - - -
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RS-artikelnummer 218-4610
Tillv. art.nrSN74LVC1G08DBVR
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2,769 kr
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AND Surface Mount 1 2 No SOT-23 5 - - - - - - -
RS-artikelnummer 662-9749
Tillv. art.nrCD74AC08M
VarumärkeTexas Instruments
2,058 kr
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AND Surface Mount 4 2 No SOIC 14 AC - 5.5 V -24mA 8.7 ns @ 5 V, 12.2 ns @ 3.3 V, 109 ns @ 1.5 V 1.5 V 24mA
RS-artikelnummer 663-0010
Tillv. art.nrCD74HC11M
VarumärkeTexas Instruments
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AND Surface Mount 3 3 No SOIC 14 HC - 6 V -5.2mA 17 ns @ 6 V, 20 ns @ 4.5 V, 100 ns @ 2 V 2 V 5.2mA
RS-artikelnummer 163-0580
Tillv. art.nrMC74ACT08DR2G
VarumärkeON Semiconductor
0,778 kr
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AND Surface Mount 4 2 No SOIC 14 AC TTL 6 V -24mA 9.5 ns @ 50 pF 2 V 24mA
RS-artikelnummer 162-9995
Tillv. art.nrMC10EP01DG
VarumärkeON Semiconductor
27,871 kr
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OR/NOR Surface Mount 1 4 No SOIC 8 ECL ECL 5.5 V - 350ps 3 V -
RS-artikelnummer 163-0471
Tillv. art.nrMC100EP01DTG
VarumärkeON Semiconductor
57,41 kr
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OR/NOR Surface Mount 1 4 No TSSOP 8 EP ECL 5.5 V - 350ps -3 V 0.5µA
RS-artikelnummer 162-7049
Tillv. art.nrSN74AHC1G86DCKR
VarumärkeTexas Instruments
0,398 kr
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XOR Surface Mount 1 2 No SC-70 5 AHC - 5.5 V -8mA 8.8 ns @ 5 V, 14.5 ns @ 3.3 V 2 V 8mA
RS-artikelnummer 186-8263
Tillv. art.nr74LCX07MTCX
VarumärkeON Semiconductor
2,85 kr
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Buffer Surface Mount 6 - - TSSOP 14 LCX - 5.5 V - 3.7 ns @ 50 pF 2 V 32mA
RS-artikelnummer 796-7950
Tillv. art.nrCD4093BF
VarumärkeTexas Instruments
157,29 kr
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NAND Through Hole 4 2 Yes CDIP 14 4000 CMOS 18 V -4.2mA 380 ns @ 50 pF 3 V 4.2mA
RS-artikelnummer 806-4018
Tillv. art.nrMC74VHC1G32DTT1G
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OR Surface Mount 1 2 No TSOP 5 VHC CMOS 5.5 V -8mA 15.5 ns @ 50 pF 2 V 8mA
RS-artikelnummer 171-3308
Tillv. art.nr74LCX86FT
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XOR Surface Mount 4 2 - TSSOP 14 74LCX CMOS 3.6 V -24mA 38.5 ns @ 50 pF 1.65 V 24mA
RS-artikelnummer 186-8274
Tillv. art.nr74LVX14MTCX
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Inverter Surface Mount 6 - Yes TSSOP 14 LVX Schmitt Trigger 3.6 V -4mA 23 ns @ 50 pF 2 V 4mA
RS-artikelnummer 144-9999
Tillv. art.nrCD4023BE
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NAND Through Hole 3 3 No PDIP 14 4000 - 18 V -4.2mA 90 ns @ 15 V, 120 ns @ 10 V, 250 ns @ 5 V 3 V 4.2mA
RS-artikelnummer 739-5181
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AND Surface Mount 1 2 No SC-70 5 TinyLogic UHS CMOS 6 V -2.6mA 125ns 2 V 2.6mA
RS-artikelnummer 145-0165
Tillv. art.nrSN74AHC86D
VarumärkeTexas Instruments
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XOR Surface Mount 4 2 No SOIC 14 AHC - 5.5 V -8mA 8.8 ns @ 5 V, 14.5 ns @ 3.3 V 2 V 8mA
RS-artikelnummer 922-2892
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NOR Through Hole 4 2 No PDIP 14 4000 - 18 V -4.2mA 50 ns @ 15 V, 60 ns @ 10 V, 120 ns @ 5 V 3 V 4.2mA
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Tillv. art.nr74LVC1G11GW,125
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AND Surface Mount 1 3 - TSSOP 6 74LVC CMOS 5.5 V - 21.5 ns @ 50 pF 1.65 V -