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.

Types of Logic Gate

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

  • AND Gates. This gate has multiple inputs that are processed to a single signal 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. Like 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

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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. 809-9607
Mfr. Part No.SN74AUP2G08DCUR
TWD14.10
Each (On a Tape of 10)
units
AND Surface Mount 2 2 No US 8 AUP Differential 3.6 V -4mA 27 ns @ 30 pF 0.8 V 4mA
RS Stock No. 796-8231
Mfr. Part No.SN74LVC1G08DCKR
TWD6.00
Each (In a Pack of 25)
units
AND Surface Mount 1 2 No SC-70 5 LVC CMOS, TTL 5.5 V -32mA 5 ns @ 5 V 1.65 V 32mA
RS Stock No. 162-6670
Mfr. Part No.SN74AUP2G08DCUR
TWD6.30
Each (On a Reel of 3000)
units
AND Surface Mount 2 2 No US 8 AUP Differential 3.6 V -4mA 27 ns @ 30 pF 0.8 V 4mA
RS Stock No. 527-643
Mfr. Part No.SN74AHC1G86DBVR
TWD6.60
Each (In a Pack of 25)
units
XOR Surface Mount 1 2 No SOT-23 5 AHC - 5.5 V -8mA 8.8 ns @ 5 V, 14.5 ns @ 3.3 V 2 V 8mA
RS Stock No. 121-9324
Mfr. Part No.SN74LVC1G08DCKR
TWD1.30
Each (On a Reel of 3000)
units
AND Surface Mount 1 2 - SC-70 5 LVC - 5.5 V -32mA 5 ns @ 5 V 1.65 V 32mA
RS Stock No. 333-2748
Mfr. Part No.SN74HC00N
TWD11.40
Each (In a Tube of 25)
units
NAND Through Hole 4 2 No PDIP 14 HC - 6 V -5.2mA 15 ns @ 6 V, 18 ns @ 4.5 V, 90 ns @ 2 V 2 V 5.2mA
RS Stock No. 813-9250
Mfr. Part No.74AUP1G32GW,125
BrandNexperia
TWD9.80
Each (On a Tape of 40)
units
OR Surface Mount 1 2 Yes TSSOP 5 AUP Schmitt Trigger 3.6 V -4mA 23.7 ns @ 30 pF 0.8 V 4mA
RS Stock No. 165-9930
Mfr. Part No.74AUP1G32GW,125
BrandNexperia
TWD2.60
Each (On a Reel of 3000)
units
OR Surface Mount 1 2 Yes TSSOP 5 AUP Schmitt Trigger 3.6 V -4mA 23.7 ns @ 30 pF 0.8 V 4mA
RS Stock No. 662-8976
Mfr. Part No.SN74LVC2G86DCUR
TWD18.60
Each (In a Pack of 5)
units
XOR Surface Mount 2 2 No VSSOP 8 LVC - 5.5 V -32mA 3.6 ns @ 5 V, 4.7 ns @ 3.3 V 1.65 V 32mA
RS Stock No. 168-4296
Mfr. Part No.SN74LVC2G86DCUT
TWD18.10
Each (On a Reel of 250)
units
OR Surface Mount 2 2 No US 8 LVC Differential 5.5 V -4mA 4.2 ns @ 50 pF 1.65 V 32mA
RS Stock No. 922-2868
Mfr. Part No.SN74LVC2G86DCUR
TWD6.70
Each (On a Reel of 3000)
units
XOR Surface Mount 2 2 No VSSOP 8 LVC - 5.5 V -32mA 3.6 ns @ 5 V, 4.7 ns @ 3.3 V 1.65 V 32mA
RS Stock No. 809-6071
Mfr. Part No.SN74LVC2G86DCUT
TWD23.60
Each (On a Tape of 10)
units
OR Surface Mount 2 2 No US 8 LVC Differential 5.5 V -4mA 4.2 ns @ 50 pF 1.65 V 32mA
RS Stock No. 670-9794
Mfr. Part No.NC7SZ08P5X
TWD7.50
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. 822-8657
Mfr. Part No.74AHC1G08SE-7
TWD2.50
Each (In a Pack of 200)
units
AND Surface Mount 1 2 Yes SOT-353 5 AHC Schmitt Trigger 5.5 V -8mA - 2 V 8mA
RS Stock No. 162-5264
Mfr. Part No.TISSN74AHC1G32DCKR
TWD1.40
Each (On a Reel of 3000)
units
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
RS Stock No. 165-8851
Mfr. Part No.74AHC1G08SE-7
TWD1.30
Each (On a Reel of 3000)
units
AND Surface Mount 1 2 Yes SOT-353 5 AHC Schmitt Trigger 5.5 V -8mA - 2 V 8mA
RS Stock No. 652-5066
Mfr. Part No.SN74AHC1G32DCKR
TWD7.70
Each (In a Pack of 10)
units
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
RS Stock No. 145-0895
Mfr. Part No.SN74LS26N
TWD27.80
Each (In a Tube of 25)
units
NAND Through Hole 4 2 No PDIP 14 LS - 5.25 V -1mA 32 ns @ 5 V 4.75 V 8mA
RS Stock No. 663-2495
Mfr. Part No.SN74LS26N
TWD33.00
Each (In a Pack of 5)
units
NAND Through Hole 4 2 No PDIP 14 LS - 5.25 V -1mA 32 ns @ 5 V 4.75 V 8mA
RS Stock No. 307-496
Mfr. Part No.SN74LS02N
TWD23.00
Each
units
NOR Through Hole 4 2 No PDIP 14 LS - 5.25 V -0.4mA 15 ns @ 5 V 4.75 V 8mA