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. 518-9164
Mfr. Part No.MC14081BDG
HK$11.74
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. 178-4794
Mfr. Part No.MC14081BDG
HK$2.161
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. 688-1521
Mfr. Part No.MC14081BDR2G
HK$4.44
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. 170-3418
Mfr. Part No.MC14081BDR2G
HK$1.18
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. 166-2397
Mfr. Part No.MM74HCT32MX
HK$1.469
Each (On a Reel of 2500)
units
OR Surface Mount 4 2 No SOIC 14 HCT - 5.5 V -4.8mA 20 ns @ 5 V 4.5 V 4.8mA
RS Stock No. 671-1848
Mfr. Part No.MM74HCT32MX
HK$3.199
Each (In a Pack of 10)
units
OR Surface Mount 4 2 No SOIC 14 HCT - 5.5 V -4.8mA 20 ns @ 5 V 4.5 V 4.8mA
RS Stock No. 163-0594
Mfr. Part No.MC74HC1G32DTT1G
HK$0.415
Each (On a Reel of 3000)
units
OR Surface Mount 1 2 No TSOP 5 HC CMOS 6 V -2.6mA 155ns 2 V 2.6mA
RS Stock No. 806-1491
Mfr. Part No.MC74HC1G32DTT1G
HK$0.805
Each (On a Tape of 100)
units
OR Surface Mount 1 2 No TSOP 5 HC CMOS 6 V -2.6mA 155ns 2 V 2.6mA
RS Stock No. 518-9192
Mfr. Part No.MC14093BDG
HK$10.86
Each
units
NAND Surface Mount 4 2 Yes SOIC 14 4000 Schmitt Trigger 18 V -4.2mA 80 ns @ 15 V, 100 ns @ 10 V, 250 ns @ 5 V 3 V 4.2mA
RS Stock No. 518-8616
Mfr. Part No.MC14001BDG
HK$11.74
Each
units
NOR Surface Mount 4 2 No SOIC 14 4000 - 18 V -4.2mA 80 ns @ 15 V, 100 ns @ 10 V, 250 ns @ 5 V 3 V 4.2mA
RS Stock No. 169-8532
Mfr. Part No.NC7SZ08M5X
HK$0.536
Each (On a Reel of 3000)
units
AND Surface Mount 1 2 No SOT-23 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. 791-6072
Mfr. Part No.MC14001BDR2G
HK$1.564
Each (On a Tape of 25)
units
NOR Surface Mount 4 2 No SOIC 14 4000 CMOS 18 V -4.2mA 350ns 0.5 V 4.2mA
RS Stock No. 163-0572
Mfr. Part No.MC74AC11DR2G
HK$1.219
Each (On a Reel of 2500)
units
AND Surface Mount 3 3 No SOIC 14 AC TTL 6 V -24mA 10 ns @ 50 pF 2 V 24mA
RS Stock No. 761-4568
Mfr. Part No.NC7WZ08K8X
HK$1.882
Each (On a Tape of 25)
units
AND Surface Mount 2 2 No US 8 - CMOS 5.5 V -32mA 5.2ns 1.65 V 32mA
RS Stock No. 166-3071
Mfr. Part No.NC7WZ08K8X
HK$1.142
Each (On a Reel of 3000)
units
AND Surface Mount 2 2 No US 8 - CMOS 5.5 V -32mA 5.2ns 1.65 V 32mA
RS Stock No. 670-9790
Mfr. Part No.NC7SZ08M5X
HK$2.011
Each (In a Pack of 10)
units
AND Surface Mount 1 2 No SOT-23 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. 807-0704
Mfr. Part No.MC10EL04DG
HK$50.62
Each (In a Pack of 2)
units
AND/NAND Surface Mount 1 2 No SOIC 8 ECL ECL 5.7 V - 395ps -4.2 V 0.3µA
RS Stock No. 162-9388
Mfr. Part No.MC14001BDR2G
HK$1.082
Each (On a Reel of 2500)
units
NOR Surface Mount 4 2 No SOIC 14 4000 CMOS 18 V -4.2mA 350ns 0.5 V 4.2mA
RS Stock No. 806-2157
Mfr. Part No.MC74AC11DR2G
HK$1.915
Each (On a Tape of 50)
units
AND Surface Mount 3 3 No SOIC 14 AC TTL 6 V -24mA 10 ns @ 50 pF 2 V 24mA
RS Stock No. 759-6696
Mfr. Part No.74AC86SC
HK$3.47
Each (In a Pack of 55)
units
XOR Surface Mount 4 2 No SOIC 14 AC - 6 V -75mA 12.5ns 2 V 75mA