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. 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. 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. 751-2761
Mfr. Part No.74AHC1G08W5-7
HK$0.561
Each (In a Pack of 100)
units
AND Surface Mount 1 2 Yes SOT-25 5 AHC Schmitt Trigger 5.5 V -8mA 10.5ns 2 V 4mA
RS Stock No. 122-1486
Mfr. Part No.74LVC1G04Z-7
HK$0.568
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. 122-0343
Mfr. Part No.74LVC1G02SE-7
HK$0.361
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. 921-0253
Mfr. Part No.74AHCT1G02SE-7
HK$0.493
Each (In a Pack of 100)
units
NOR Surface Mount 1 2 No SOT-353 5 AHCT CMOS 5.5 V -8mA 9.5 ns @ 50 pF 4.5 V 8mA
RS Stock No. 169-7240
Mfr. Part No.74HC86S14-13
HK$0.685
Each (On a Reel of 2500)
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. 798-9102
Mfr. Part No.74HCT86S14-13
HK$2.196
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. 751-2777
Mfr. Part No.74AHC1G86W5-7
HK$0.58
Each (In a Pack of 100)
units
XOR Surface Mount 1 2 Yes SOT-25 5 AHC Schmitt Trigger 5.5 V -8mA 11.5ns 2 V 4mA
RS Stock No. 921-0818
Mfr. Part No.ULN2003F12FN-7
HK$2.11
Each (In a Pack of 50)
units
- Surface Mount - - - DFN3030 10 - CMOS 5 V - 140ns 3.3 V 140mA
RS Stock No. 798-9054
Mfr. Part No.74HCT00T14-13
HK$1.393
Each (On a Tape of 25)
units
NAND Surface Mount 4 2 Yes TSSOP 14 HCT Schmitt Trigger 5.5 V -4mA 29 ns @ 50 pF 4.5 V 4mA
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. 169-7241
Mfr. Part No.74HCT00S14-13
HK$0.759
Each (On a Reel of 2500)
units
NAND Surface Mount 4 2 Yes SOIC 14 HCT Schmitt Trigger 5.5 V -4mA 29 ns @ 50 pF 4.5 V 4mA
RS Stock No. 169-7130
Mfr. Part No.74LVC32AT14-13
HK$0.785
Each (On a Reel of 2500)
units
OR Surface Mount 4 2 No TSSOP 14 LVC CMOS 5.5 V -24mA 5.5 ns @ 2.7 V 1.65 V 24mA
RS Stock No. 165-8859
Mfr. Part No.74LVC1G58W6-7
HK$0.303
Each (On a Reel of 3000)
units
Multifunction Surface Mount 1 3 No SOT-26 6 LVC CMOS 5.5 V -32mA - 1.65 V 32mA
RS Stock No. 166-0413
Mfr. Part No.74LVC1G02W5-7
HK$0.287
Each (On a Reel of 3000)
units
NOR Surface Mount 1 2 No SOT-25 5 LVC - 5.5 V -32mA 5.5ns 1.65 V 32mA
RS Stock No. 798-8853
Mfr. Part No.74AHC00S14-13
HK$1.837
Each (In a Pack of 25)
units
NAND Surface Mount 4 2 Yes SOIC 14 AHC Schmitt Trigger 5.5 V -4mA 14.5 ns @ 50 pF 2 V 8mA
RS Stock No. 822-8650
Mfr. Part No.74AHC1G00W5-7
HK$0.606
Each (In a Pack of 100)
units
NAND Surface Mount 1 2 Yes SOT-25 5 AHC Schmitt Trigger 5.5 V -8mA - 2 V 8mA