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. 169-7221
Mfr. Part No.74AHC86T14-13
HK$0.685
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. 798-8910
Mfr. Part No.74AHC86T14-13
HK$1.594
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. 921-0815
Mfr. Part No.ULN2003V12T16-13
HK$1.724
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
HK$1.093
Each (On a Reel of 2500)
units
- Surface Mount - - - TSSOP 16 - CMOS 5 V - 140ns 3.3 V 140mA
RS Stock No. 165-8332
Mfr. Part No.ZXGD3009DYTA
HK$0.736
Each (On a Reel of 3000)
units
Non-Inverting Surface Mount 2 - - SOT-363 6 - Single 40 V - - - -
RS Stock No. 121-9578
Mfr. Part No.74LVC1G86Z-7
HK$0.517
Each (On a Reel of 4000)
units
XOR Surface Mount 1 3 - SOT-553 5 LVC CMOS 5.5 V -32mA 7.5 ns @ 2.7 V 1.65 V 32mA
RS Stock No. 169-7243
Mfr. Part No.74HCT08S14-13
HK$0.759
Each (On a Reel of 2500)
units
AND Surface Mount 4 2 Yes SOIC 14 HCT Schmitt Trigger 5.5 V -4mA 36 ns @ 50 pF 4.5 V 4mA
RS Stock No. 751-2783
Mfr. Part No.74LVC1G02SE-7
HK$0.812
Each (In a Pack of 100)
units
NOR Surface Mount 1 2 No SOT-353 5 LVC - 5.5 V -32mA 5.5ns 1.65 V 32mA
RS Stock No. 921-0281
Mfr. Part No.74LVC1G11W6-7
HK$0.714
Each (In a Pack of 100)
units
AND Surface Mount 1 3 No SOT-26 5 LVC CMOS 5.5 V -32mA 3.7 ns @ 15 pF 1.65 V 32mA
RS Stock No. 122-0341
Mfr. Part No.74LVC1G00SE-7
HK$0.253
Each (On a Reel of 3000)
units
NAND Surface Mount 1 2 - SOT-353 5 LVC - 5.5 V -32mA 5.5ns 1.65 V 32mA
RS Stock No. 770-5351
Mfr. Part No.74LVC1G14FZ4-7
HK$2.138
Each (In a Pack of 25)
units
NOT Surface Mount 1 - - DFN 6 LVC Schmitt Trigger 5.5 V -32mA 14 ns @ 1.8 V 1.65 V 32mA
RS Stock No. 798-9048
Mfr. Part No.74HC86S14-13
HK$1.784
Each (In a Pack of 25)
units
XOR Surface Mount 4 2 Yes SOIC 14 HC Schmitt Trigger 6 V -4mA 135 ns @ 50 pF 2 V 5.2mA
RS Stock No. 146-0942
Mfr. Part No.74LVC1G11W6-7
HK$0.364
Each (On a Reel of 3000)
units
AND Surface Mount 1 3 No SOT-26 5 LVC CMOS 5.5 V -32mA 3.7 ns @ 15 pF 1.65 V 32mA
RS Stock No. 169-7483
Mfr. Part No.74LV86AS14-13
HK$0.864
Each (On a Reel of 2500)
units
XOR Surface Mount 4 2 Yes SOIC 14 LV Schmitt Trigger 5.5 V -12mA 11 ns @ 50 pF 2 V 12mA
RS Stock No. 751-2800
Mfr. Part No.74LVC1G08W5-7
HK$0.698
Each (In a Pack of 100)
units
AND Surface Mount 1 2 No SOT-25 5 LVC - 5.5 V -32mA 5.5ns 1.65 V 32mA
RS Stock No. 921-1265
Mfr. Part No.ZXGD3009DYTA
HK$2.216
Each (In a Pack of 50)
units
Non-Inverting Surface Mount 2 - - SOT-363 6 - Single 40 V - - - -
RS Stock No. 166-0415
Mfr. Part No.74LVC1G32W5-7
HK$0.254
Each (On a Reel of 3000)
units
OR Surface Mount 1 2 No SOT-25 5 LVC - 5.5 V -32mA 5.5ns 1.65 V 32mA
RS Stock No. 770-5294
Mfr. Part No.74LVC00AT14-13
HK$1.585
Each (In a Pack of 25)
units
NAND Surface Mount 4 2 No TSSOP 14 LVC CMOS 5.5 V -24mA 6.5 ns @ 2.7 V 1.65 V 24mA
RS Stock No. 169-7126
Mfr. Part No.74LVC1G08Z-7
HK$0.533
Each (On a Reel of 4000)
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. 146-0935
Mfr. Part No.74AHC1G32W5-7
HK$0.276
Each (On a Reel of 3000)
units
OR Surface Mount 1 2 No SOT-25 5 AHC CMOS 5.5 V -8mA 9.5 ns @ 50 pF 2 V 8mA