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. 305-181
Mfr. Part No.SN74LS33N
HK$14.55
Each
units
NOR Through Hole 4 2 No PDIP 14 LS - 5.25 V -0.25mA 32 ns @ 5 V 4.75 V 24mA
RS Stock No. 145-5920
Mfr. Part No.SN74LS33N
HK$13.209
Each (In a Tube of 25)
units
NOR Through Hole 4 2 No PDIP 14 LS - 5.25 V -0.25mA 32 ns @ 5 V 4.75 V 24mA
RS Stock No. 526-537
Mfr. Part No.CD4011BE
HK$4.652
Each (In a Tube of 25)
units
NAND Through Hole 4 2 No PDIP 14 4000 - 18 V -4.2mA 90 ns @ 15 V, 120 ns @ 10 V, 250 ns @ 5 V 3 V 4.2mA
RS Stock No. 662-7550
Mfr. Part No.SN74AC08DR
HK$3.08
Each (In a Pack of 10)
units
AND Surface Mount 4 2 No SOIC 14 AC - 6 V -24mA 7.5 ns @ 5 V, 9.5 ns @ 3.3 V 2 V 24mA
RS Stock No. 144-9938
Mfr. Part No.CD4077BE
HK$2.70
Each (In a Tube of 25)
units
XNOR Through Hole 4 2 No PDIP 14 4000 - 18 V -4.2mA 100 ns @ 15 V, 130 ns @ 10 V, 280 ns @ 5 V 3 V 4.2mA
RS Stock No. 179-2125
Mfr. Part No.SN74AC08DR
HK$3.08
Each (In a Tube of 50)
units
AND Surface Mount 4 2 No SOIC 14 AC - 6 V -24mA 7.5 ns @ 5 V, 9.5 ns @ 3.3 V 2 V 24mA
RS Stock No. 662-9666
Mfr. Part No.CD4077BE
HK$4.88
Each (In a Pack of 5)
units
XNOR Through Hole 4 2 No PDIP 14 4000 - 18 V -4.2mA 100 ns @ 15 V, 130 ns @ 10 V, 280 ns @ 5 V 3 V 4.2mA
RS Stock No. 121-8348
Mfr. Part No.CD4011BE
HK$4.652
Each (In a Tube of 25)
units
NAND Through Hole 4 2 - PDIP 14 4000 - 18 V -4.2mA 90 ns @ 15 V, 120 ns @ 10 V, 250 ns @ 5 V 3 V 4.2mA
RS Stock No. 709-2968
Mfr. Part No.CD4011UBE
HK$3.687
Each (In a Pack of 10)
units
NAND Through Hole 4 2 No PDIP 14 4000 - 18 V -4.2mA 50 ns @ 15 V, 60 ns @ 10 V, 120 ns @ 5 V 3 V 4.2mA
RS Stock No. 145-0875
Mfr. Part No.CD74HCT21M
HK$1.922
Each (In a Tube of 50)
units
AND Surface Mount 2 4 No SOIC 14 HCT - 5.5 V -4mA 27 ns @ 4.5 V 4.5 V 4mA
RS Stock No. 662-7282
Mfr. Part No.CD74HCT21M96
HK$2.772
Each (In a Pack of 10)
units
AND Surface Mount 2 4 No SOIC 14 HCT - 5.5 V -4mA 27 ns @ 4.5 V 4.5 V 4mA
RS Stock No. 923-6801
Mfr. Part No.CD4011UBE
HK$3.615
Each (In a Tube of 25)
units
NAND Through Hole 4 2 No PDIP 14 4000 - 18 V -4.2mA 50 ns @ 15 V, 60 ns @ 10 V, 120 ns @ 5 V 3 V 4.2mA
RS Stock No. 162-6972
Mfr. Part No.CD74HCT21M96
HK$0.859
Each (On a Reel of 2500)
units
AND Surface Mount 2 4 No SOIC 14 HCT - 5.5 V -4mA 27 ns @ 4.5 V 4.5 V 4mA
RS Stock No. 162-7416
Mfr. Part No.SN74LS38NE4
HK$5.638
Each (In a Tube of 25)
units
NAND Through Hole 4 2 No PDIP 14 LS - 5.25 V -0.25mA 32 ns @ 5 V 4.75 V 24mA
RS Stock No. 633-953
Mfr. Part No.CD74HCT32E
HK$5.50
Each
units
OR Through Hole 4 2 No PDIP 14 HCT - 5.5 V -4mA 24 ns @ 4.5 V 4.5 V 4mA
RS Stock No. 663-1221
Mfr. Part No.SN74AHCT08D
HK$2.699
Each (In a Pack of 10)
units
AND Surface Mount 4 2 No SOIC 14 AHCT - 5.5 V -8mA 7.9 ns @ 5 V 4.5 V 8mA
RS Stock No. 527-924
Mfr. Part No.CD40107BE
HK$4.767
Each (In a Tube of 50)
units
NAND Through Hole 2 2 No PDIP 8 4000 - 18 V - 100 ns @ 15 V, 120 ns @ 10 V, 200 ns @ 5 V 3 V 89mA
RS Stock No. 442-993
Mfr. Part No.SN74HC86N
HK$4.35
Each
units
XOR Through Hole 4 2 No PDIP 14 HC - 6 V -5.2mA 17 ns @ 6 V, 20 ns @ 4.5 V, 100 ns @ 2 V 2 V 5.2mA
RS Stock No. 162-6719
Mfr. Part No.SN74LVC1G86DCKR
HK$0.37
Each (On a Reel of 3000)
units
XOR 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. 709-2292
Mfr. Part No.SN74LS38NE4
HK$9.166
Each (In a Pack of 5)
units
NAND Through Hole 4 2 No PDIP 14 LS - 5.25 V -0.25mA 32 ns @ 5 V 4.75 V 24mA