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 186-8592
Tillv. art.nr74ACT00SC
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3,644 kr
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NAND Surface Mount 4 2 - SOIC 14 ACT TTL 5.5 V -24mA 9.5 ns @ 50 pF 4.5 V 24mA
RS-artikelnummer 171-3317
Tillv. art.nr74VHC132FT
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NAND Surface Mount 4 2 Yes TSSOP 14 74VHC CMOS, Schmitt Trigger 5.5 V -8mA 19.5 ns @ 50 pF 2 V 8mA
RS-artikelnummer 145-7004
Tillv. art.nrCD4023BMT
VarumärkeTexas Instruments
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NAND Surface Mount 3 3 No SOIC 14 4000 Differential 18 V -4.2mA 250 ns @ 50 pF 3 V 4.2mA
RS-artikelnummer 171-3400
Tillv. art.nr74VHC32FT
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2,568 kr
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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
RS-artikelnummer 663-1127
Tillv. art.nrSN74AHC08D
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AND Surface Mount 4 2 No SOIC 14 AHC - 5.5 V -8mA 7.9 ns @ 5 V, 12.3 ns @ 3.3 V 2 V 8mA
RS-artikelnummer 171-3181
Tillv. art.nrTC7SZ02FE
VarumärkeToshiba
0,90 kr
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NOR Surface Mount 1 2 - SOT-553 5 - CMOS 5.5 V -32mA 11 ns @ 15 pF 1.65 V 32mA
RS-artikelnummer 709-2217
Tillv. art.nrSN74HC20NE4
VarumärkeTexas Instruments
3,232 kr
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NAND Through Hole 2 4 No PDIP 14 HC - 6 V -5.2mA 19 ns @ 6 V, 22 ns @ 4.5 V, 110 ns @ 2 V 2 V 5.2mA
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Tillv. art.nrSN74LVC1G332DCKRG4
VarumärkeTexas Instruments
0,899 kr
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OR Surface Mount 1 3 No SC-70 6 LVC - 5.5 V -32mA 3.5 ns @ 5 V, 4.8 ns @ 3.3 V 1.65 V 32mA
RS-artikelnummer 670-9731
Tillv. art.nrMM74HC00MX
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3,754 kr
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NAND Surface Mount 4 2 No SOIC 14 HC - 6 V -5.2mA 15 ns @ 6 V, 18 ns @ 4.5 V, 90 ns @ 2 V 2 V 5.2mA
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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
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Tillv. art.nrSN74HCT00N
VarumärkeTexas Instruments
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NAND Through Hole 4 2 No PDIP 14 HCT - 5.5 V -4mA 18 ns @ 5.5 V, 20 ns @ 4.5 V 4.5 V 4mA
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Tillv. art.nrMC74VHC1G01DFT1G
VarumärkeON Semiconductor
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NAND Surface Mount 1 2 No SC-88A 5 VHC CMOS 5.5 V - 15.5 ns @ 50 pF 2 V 8mA
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Tillv. art.nrSN74AHCT08PWR
VarumärkeTexas Instruments
0,55 kr
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AND Surface Mount 4 2 No TSSOP 14 AHCT - 5.5 V -8mA 7.9 ns @ 5 V 4.5 V 8mA
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NAND Through Hole 2 4 No PDIP 14 LS - 5.25 V -0.4mA 15 ns @ 5 V 4.75 V 8mA
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Tillv. art.nrCD4081BE
VarumärkeTexas Instruments
4,104 kr
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AND Through Hole 4 2 No PDIP 14 - - - - - - -
RS-artikelnummer 171-3443
Tillv. art.nr74HC02D
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NOR Surface Mount 4 2 - SOIC 14 74HC - 6 V -5.2mA 95 ns @ 50 pF 2 V 5.2mA
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NAND Surface Mount 4 2 Yes TSSOP14 14 - - - - - - -
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NOR Surface Mount 1 2 No SC-70 5 TinyLogic ULP CMOS 3.6 V -2.6mA 43 ns @ 30 pF 0.9 V 2.6mA
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Tillv. art.nrMC100EP05DTG
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AND/NAND Surface Mount 1 2 No TSSOP 8 EP ECL 5.5 V - 320ps -3 V 0.5µA
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Tillv. art.nr74LCX08M
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AND Surface Mount 4 2 No SOIC 14 LCX - 3.6 V -24mA 5.5 ns @ 3.3 V, 6.2 ns @ 2.7 V 2 V 24mA