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.

The RS components range offers semiconductor logic gates from leading brands, with input/output configurations to suit the demands of your digital circuit.

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.

There are also logic gates referred to as Exclusive Gates.

• XNOR (EX-NOR) Gate. These gates process a high signal if all input signals are true, e.g: if there are two one signals or two zero signals.

• XOR Gate. Unlike an XNOR, XOR performs exclusive dis-junction, which means it will only output a true signal if exactly one of the inputs are true.

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. Though their essential functions remain unchanged, their implementations are many.

• Encoders
• Decoders
• Multiplexers
• Demultiplexers
• Full adders
• 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. 662-7282
Mfr. Part No.CD74HCT21M96
HK$2.73
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. 145-0875
Mfr. Part No.CD74HCT21M
HK$3.265
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. 169-5704
Mfr. Part No.SN74LVC32ADR
HK$0.851
Each (On a Reel of 2500)
units
OR Surface Mount 4 2 No SOIC 14 LVC - 3.6 V -24mA 3.6 ns @ 3.3 V, 4.2 ns @ 2.7 V 1.65 V 24mA
RS Stock No. 528-107
Mfr. Part No.SN74LVC32AD
HK$2.683
Each (In a Tube of 50)
units
OR Surface Mount 4 2 No SOIC 14 LVC - 3.6 V -24mA 3.6 ns @ 3.3 V, 4.2 ns @ 2.7 V 1.65 V 24mA
RS Stock No. 169-7221
Mfr. Part No.74AHC86T14-13
HK$0.993
Each (On a Reel of 2500)
units
XOR Surface Mount 4 2 Yes TSSOP 14 AHC Schmitt Trigger 5.5 V -4mA 18.5 ns @ 50 pF 2 V 8mA
RS Stock No. 124-2273
Mfr. Part No.74LVC2G32DP,125
BrandNexperia
HK$1.35
Each (On a Reel of 3000)
units
OR Surface Mount 2 2 - TSSOP 8 LVC TTL 5.5 V -32mA 6 ns @ 50 pF 1.65 V 32mA
RS Stock No. 663-0543
Mfr. Part No.CD74HCT21M
HK$2.392
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. 816-8839
Mfr. Part No.74LVC2G32DP,125
BrandNexperia
HK$3.36
Each (In a Pack of 30)
units
OR Surface Mount 2 2 No TSSOP 8 LVC TTL 5.5 V -32mA 6 ns @ 50 pF 1.65 V 32mA
RS Stock No. 923-6801
Mfr. Part No.CD4011UBE
HK$3.62
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. 709-2968
Mfr. Part No.CD4011UBE
HK$3.729
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. 662-8994
Mfr. Part No.SN74LVC32ADR
HK$2.338
Each (In a Pack of 10)
units
OR Surface Mount 4 2 No SOIC 14 LVC - 3.6 V -24mA 3.6 ns @ 3.3 V, 4.2 ns @ 2.7 V 1.65 V 24mA
RS Stock No. 162-6972
Mfr. Part No.CD74HCT21M96
HK$0.958
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. 798-8910
Mfr. Part No.74AHC86T14-13
HK$1.292
Each (On a Tape of 25)
units
XOR Surface Mount 4 2 Yes TSSOP 14 AHC Schmitt Trigger 5.5 V -4mA 18.5 ns @ 50 pF 2 V 8mA
RS Stock No. 510-403
Mfr. Part No.74LVC1G32GW,125
BrandNexperia
HK$1.267
Each (In a Pack of 50)
units
OR Surface Mount 1 2 No TSSOP 5 LVC - 5.5 V -32mA - 1.65 V 32mA
RS Stock No. 527-277
Mfr. Part No.CD74HC00E
HK$4.244
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. 633-953
Mfr. Part No.CD74HCT32E
HK$4.96
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. 663-0468
Mfr. Part No.CD74HCT11M
HK$3.451
Each (In a Pack of 10)
units
AND Surface Mount 3 3 No SOIC 14 HCT - 5.5 V -4mA 28 ns @ 4.5 V 4.5 V 4mA
RS Stock No. 662-8815
Mfr. Part No.SN74LVC1G86DCKT
HK$7.27
Each (In a Pack of 5)
units
XOR Surface Mount 1 2 No SC-70 5 LVC - 5.5 V -32mA 4 ns @ 5 V, 5 ns @ 3.3 V 1.65 V 32mA
RS Stock No. 333-2748
Mfr. Part No.SN74HC00N
HK$3.409
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. 145-0438
Mfr. Part No.CD74HCT11M
HK$3.451
Each (In a Tube of 50)
units
AND Surface Mount 3 3 No SOIC 14 HCT - 5.5 V -4mA 28 ns @ 4.5 V 4.5 V 4mA
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