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. 921-0811
Mfr. Part No.ULN2003V12S16-13
SGD0.599
Each (In a Pack of 30)
units
- Surface Mount - - - SOIC 16 - CMOS 5 V - 140ns 3.3 V 140mA
RS Stock No. 165-8350
Mfr. Part No.ULN2003V12S16-13
SGD0.265
Each (On a Reel of 2500)
units
- Surface Mount - - - SOIC 16 - CMOS 5 V - 140ns 3.3 V 140mA
RS Stock No. 770-5327
Mfr. Part No.74LVC1G04Z-7
SGD0.477
Each (In a Pack of 50)
units
NOT Surface Mount 1 - - SOT-553 5 LVC CMOS 5.5 V -32mA 7 ns @ 2.7 V 1.65 V 32mA
RS Stock No. 122-1486
Mfr. Part No.74LVC1G04Z-7
SGD0.121
Each (On a Reel of 4000)
units
Inverter Surface Mount - - No SOT-553 5 LVC CMOS 5.5 V -32mA 7 ns @ 2.7 V 1.65 V 32mA
RS Stock No. 921-0815
Mfr. Part No.ULN2003V12T16-13
SGD0.58
Each (In a Pack of 30)
units
- Surface Mount - - - TSSOP 16 - CMOS 5 V - 140ns 3.3 V 140mA
RS Stock No. 146-0953
Mfr. Part No.ULN2003V12T16-13
SGD0.236
Each (On a Reel of 2500)
units
- Surface Mount - - - TSSOP 16 - CMOS 5 V - 140ns 3.3 V 140mA
RS Stock No. 146-0932
Mfr. Part No.74AHC1G02W5-7
SGD0.07
Each (On a Reel of 3000)
units
NOR Surface Mount 1 2 No SOT-25 5 AHC CMOS 5.5 V -8mA 9.5 ns @ 50 pF 2 V 8mA
RS Stock No. 122-0339
Mfr. Part No.74AHC1G08W5-7
SGD0.067
Each (On a Reel of 3000)
units
AND Surface Mount 1 2 - SOT-25 5 AHC Schmitt Trigger 5.5 V -8mA 10.5ns 2 V 4mA
RS Stock No. 122-0343
Mfr. Part No.74LVC1G02SE-7
SGD0.08
Each (On a Reel of 3000)
units
NOR Surface Mount 1 2 - SOT-353 5 LVC - 5.5 V -32mA 5.5ns 1.65 V 32mA
RS Stock No. 798-9102
Mfr. Part No.74HCT86S14-13
SGD0.499
Each (On a Tape of 25)
units
XOR Surface Mount 4 2 Yes SOIC 14 HCT Schmitt Trigger 5.5 V -4mA 48 ns @ 50 pF 4.5 V 4mA
RS Stock No. 770-5333
Mfr. Part No.74LVC1G08Z-7
SGD0.476
Each (On a Tape of 50)
units
AND Surface Mount 1 2 No SOT-553 5 LVC CMOS 5.5 V -32mA 7 ns @ 2.7 V 1.65 V 32mA
RS Stock No. 770-5339
Mfr. Part No.74LVC1G07Z-7
SGD0.476
Each (In a Pack of 50)
units
Non-Inverting Surface Mount 1 - - SOT-553 5 LVC CMOS 5.5 V -32mA 6 ns @ 2.7 V 1.65 V 32mA
RS Stock No. 921-0290
Mfr. Part No.74LVC1G57DW-7
SGD0.136
Each (In a Pack of 100)
units
Multifunction Surface Mount 1 2 No SOT-363 6 LVC CMOS 5.5 V -32mA 6.4 ns @ 50 pF 1.65 V 32mA
RS Stock No. 751-2787
Mfr. Part No.74LVC1G02W5-7
SGD0.18
Each (In a Pack of 100)
units
NOR Surface Mount 1 2 No SOT-25 5 LVC - 5.5 V -32mA 5.5ns 1.65 V 32mA
RS Stock No. 169-7125
Mfr. Part No.74LVC1G02Z-7
SGD0.115
Each (On a Reel of 4000)
units
NOR Surface Mount 1 2 No SOT-553 5 LVC CMOS 5.5 V -32mA 7 ns @ 2.7 V 1.65 V 32mA
RS Stock No. 169-7238
Mfr. Part No.74HC32T14-13
SGD0.16
Each (On a Reel of 2500)
units
OR Surface Mount 4 2 Yes TSSOP 14 HC Schmitt Trigger 6 V -4mA 135 ns @ 50 pF 2 V 5.2mA
RS Stock No. 169-7231
Mfr. Part No.74HC00T14-13
SGD0.16
Each (On a Reel of 2500)
units
NAND Surface Mount 4 2 Yes TSSOP 14 HC Schmitt Trigger 6 V -4mA 135 ns @ 50 pF 2 V 5.2mA
RS Stock No. 122-0350
Mfr. Part No.74LVC1G32SE-7
SGD0.062
Each (On a Reel of 3000)
units
OR Surface Mount 1 2 - SOT-353 5 LVC - 5.5 V -32mA 5.5ns 1.65 V 32mA
RS Stock No. 921-0271
Mfr. Part No.74AHCT1G32SE-7
SGD0.109
Each (In a Pack of 100)
units
OR Surface Mount 1 2 No SOT-353 5 AHCT CMOS 5.5 V -8mA 10 ns @ 50 pF 4.5 V 8mA
RS Stock No. 169-7251
Mfr. Part No.74HCT86S14-13
SGD0.178
Each (On a Reel of 2500)
units
XOR Surface Mount 4 2 Yes SOIC 14 HCT Schmitt Trigger 5.5 V -4mA 48 ns @ 50 pF 4.5 V 4mA