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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Tillv. art.nr74HC00D
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Tillv. art.nr74AHC1G04W5-7
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Inverter Surface Mount 1 - - SOT-25 5 AHC CMOS 5.5 V -8mA 9.5 ns @ 50 pF 2 V 8mA
RS-artikelnummer 186-7336
Tillv. art.nrNL7SZ97DFT2G
VarumärkeON Semiconductor
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Multifunction Surface Mount 1 2 Yes SC 88 NL Schmitt Trigger 5.5 V -32mA 14.4 ns @ 50 pF 1.65 V 32mA
RS-artikelnummer 170-7993
Tillv. art.nrHEF4011BT,653
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NAND Surface Mount 4 2 - SO 14 HEF CMOS 15 V -4.2mA 110 ns @ 50 pF 3 V 4.2mA
RS-artikelnummer 195-2643
Tillv. art.nrMC74VHC1G32P5T5G
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OR Surface Mount 1 2 - SOT 5 - CMOS 5.5 V ±20mA - 2 V -
RS-artikelnummer 145-3977
Tillv. art.nrM74VHC1GT00DFT1G
VarumärkeON Semiconductor
0,279 kr
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NAND Surface Mount 1 2 No SC-88A 5 VHC TTL 5.5 V -8mA 17.5 ns @ 50 pF 3 V 8mA
RS-artikelnummer 179-2158
Tillv. art.nrSN74ACT08D
VarumärkeTexas Instruments
4,624 kr
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AND Surface Mount 4 2 No SOIC 14 ACT - 5.5 V -24mA 9 ns @ 5 V 4.5 V 24mA
RS-artikelnummer 169-8532
Tillv. art.nrNC7SZ08M5X
VarumärkeON Semiconductor
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AND Surface Mount 1 2 No SOT-23 5 TinyLogic UHS - 5.5 V -32mA 4.5 ns @ 5 V, 5.2 ns @ 3.3 V 1.65 V 32mA
RS-artikelnummer 663-1871
Tillv. art.nrSN74HC03D
VarumärkeTexas Instruments
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NAND Surface Mount 4 2 No SOIC 14 HC - 6 V -0.005mA 23 ns @ 6 V, 25 ns @ 4.5 V, 105 ns @ 2 V 2 V 5.2mA
RS-artikelnummer 145-0768
Tillv. art.nrCD4075BPW
VarumärkeTexas Instruments
1,178 kr
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OR Surface Mount 3 3 No TSSOP 14 4000 Differential 18 V -4.2mA 250 ns @ 50 pF 3 V 4.2mA
RS-artikelnummer 166-0415
Tillv. art.nr74LVC1G32W5-7
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OR Surface Mount 1 2 No SOT-25 5 LVC - 5.5 V -32mA 5.5ns 1.65 V 32mA
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Tillv. art.nrM74VHC1G132DTT1G
VarumärkeON Semiconductor
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NAND Surface Mount 1 1 Yes TSOP 5 74VHC Schmitt Trigger 5.5 V - 19.6ns 2 V -
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Tillv. art.nrTISSN74AHC1G32DCKR
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OR Surface Mount 1 2 No SC-70 5 AHC - 5.5 V -8mA 7.5 ns @ 5 V, 11.4 ns @ 3.3 V 2 V 8mA
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Tillv. art.nr74AC08SCX
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1,965 kr
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AND Surface Mount 4 2 No SOIC 14 AC - 6 V -24mA 10ns 2 V 24mA
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Tillv. art.nr74LVC1G86SE-7
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XOR Surface Mount 1 2 No SOT-353 5 LVC - 5.5 V -32mA 5.5ns 1.65 V 32mA
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AND Surface Mount 1 2 No SC-70 5 TinyLogic UHS - 5.5 V -32mA 4.5 ns @ 5 V, 5.2 ns @ 3.3 V 1.65 V 32mA
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Tillv. art.nrULN2003F12FN-7
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- Surface Mount - - - DFN3030 10 - CMOS 5 V - 140ns 3.3 V 140mA
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AND Surface Mount 4 2 No SOIC 16 AC Differential 5.5 V -24mA 10.2 ns @ 50 pF 3 V 24mA
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NAND Surface Mount 1 8 No SOIC 14 HC CMOS 6 V -5.2mA 195ns 2 V 5.2mA
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Tillv. art.nrM74VHC1G132DTT1G
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NAND Surface Mount 1 1 Yes TSOP 5 74VHC Schmitt Trigger 5.5 V - 19.6ns 2 V -