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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Description Price 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 Stock No. 670-9794
Mfr. Part No.NC7SZ08P5X
TWD8.00
Each (In a Pack of 10)
units
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
RS Stock No. 805-1497
Mfr. Part No.M74VHC1G132DFT1G
TWD3.00
Each (In a Pack of 100)
units
NAND Surface Mount 1 2 Yes SC-88A 5 VHC Schmitt Trigger 5.5 V -8mA 19.6 ns @ 50 pF 2 V 8mA
RS Stock No. 145-5225
Mfr. Part No.M74VHC1G132DFT1G
TWD1.60
Each (On a Reel of 3000)
units
NAND Surface Mount 1 2 Yes SC-88A 5 VHC Schmitt Trigger 5.5 V -8mA 19.6 ns @ 50 pF 2 V 8mA
RS Stock No. 518-9164
Mfr. Part No.MC14081BDG
TWD16.00
Each
units
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
RS Stock No. 166-2758
Mfr. Part No.74VHC00MTCX
TWD4.20
Each (On a Reel of 2500)
units
NAND Surface Mount 4 2 No TSSOP 14 VHC - 5.5 V -8mA 7.5 ns @ 5 V, 11.4 ns @ 3.3 V 2 V 8mA
RS Stock No. 184-4286
Mfr. Part No.MC74HC86ADG
TWD8.90
Each (In a Tube of 55)
units
XOR Surface Mount 1 1 - SOIC 14 74HC - 6 V - 150ns 2 V -
RS Stock No. 170-3418
Mfr. Part No.MC14081BDR2G
TWD3.90
Each (On a Reel of 2500)
units
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
RS Stock No. 688-1521
Mfr. Part No.MC14081BDR2G
TWD14.60
Each (In a Pack of 5)
units
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
RS Stock No. 761-4375
Mfr. Part No.74VHC00MTCX
TWD12.10
Each (In a Pack of 25)
units
NAND Surface Mount 4 2 No TSSOP 14 VHC CMOS 5.5 V -8mA 13ns 2 V 8mA
RS Stock No. 739-0091
Mfr. Part No.NC7SZ32M5X
TWD9.20
Each (In a Pack of 10)
units
OR Surface Mount 1 2 No SOT-23 5 TinyLogic UHS CMOS 5.5 V -32mA 5.5ns 1.65 V 32mA
RS Stock No. 145-4504
Mfr. Part No.74VHC00MTC
TWD3.50
Each (In a Tube of 94)
units
NAND Surface Mount 4 2 No TSSOP 14 VHC - 5.5 V -8mA 7.5 ns @ 5 V, 11.4 ns @ 3.3 V 2 V 8mA
RS Stock No. 178-4794
Mfr. Part No.MC14081BDG
TWD12.60
Each (In a Tube of 55)
units
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
RS Stock No. 169-8554
Mfr. Part No.NC7SZ32M5X
TWD2.40
Each (On a Reel of 3000)
units
OR Surface Mount 1 2 No SOT-23 5 TinyLogic UHS CMOS 5.5 V -32mA 5.5ns 1.65 V 32mA
RS Stock No. 739-5181
Mfr. Part No.NC7S08P5X
TWD7.00
Each (In a Pack of 10)
units
AND Surface Mount 1 2 No SC-70 5 TinyLogic UHS CMOS 6 V -2.6mA 125ns 2 V 2.6mA
RS Stock No. 739-5188
Mfr. Part No.NC7SZ57P6X
TWD9.10
Each (In a Pack of 10)
units
Multifunction Surface Mount 2 2 Yes SC-70 6 TinyLogic UHS Schmitt Trigger 5.5 V -32mA 6.5ns 1.65 V 32mA
RS Stock No. 163-0586
Mfr. Part No.MC74HC00ADR2G
TWD3.10
Each (On a Reel of 2500)
units
NAND Surface Mount 4 2 No SOIC 14 LS CMOS 6 V 5.2mA 110 ns @ 50 pF 2 V 5.2mA
RS Stock No. 806-4005
Mfr. Part No.MC74VHC1G32DFT1G
TWD2.80
Each (On a Tape of 100)
units
OR Surface Mount 1 2 No SC-88A 5 VHC CMOS 5.5 V -8mA 15.5 ns @ 50 pF 2 V 8mA
RS Stock No. 163-0587
Mfr. Part No.MC74HC00ADTR2G
TWD3.10
Each (On a Reel of 2500)
units
NAND Surface Mount 4 2 No TSSOP 14 LS CMOS 6 V 5.2mA 110 ns @ 50 pF 2 V 5.2mA
RS Stock No. 163-0627
Mfr. Part No.MC74VHC1G08DTT1G
TWD1.90
Each (On a Reel of 3000)
units
AND Surface Mount 1 2 No TSOP 5 VHC CMOS 5.5 V -8mA 16.5 ns @ 50 pF 2 V 8mA
RS Stock No. 806-2356
Mfr. Part No.MC74HC00ADR2G
TWD9.90
Each (In a Pack of 50)
units
NAND Surface Mount 4 2 No SOIC 14 LS CMOS 6 V 5.2mA 110 ns @ 50 pF 2 V 5.2mA