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. 333-2748
Mfr. Part No.SN74HC00N
£0.301
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. 368-5884
Mfr. Part No.SN74LS00N
£0.41
Each (In a Tube of 25)
Units
NAND Through Hole 4 2 No PDIP 14 LS - 5.25 V -0.4mA 15 ns @ 5 V 4.75 V 8mA
RS Stock No. 527-384
Mfr. Part No.SN74HC00DR
£0.202
Each (In a Pack of 25)
Units
NAND Surface Mount 4 2 No SOIC 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. 526-234
Mfr. Part No.SN74HC00D
£0.257
Each (In a Tube of 50)
Units
NAND Surface Mount 4 2 No SOIC 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. 168-4861
Mfr. Part No.SN74HC00DR
£0.062
Each (On a Reel of 2500)
Units
NAND Surface Mount 4 2 No SOIC 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. 526-537
Mfr. Part No.CD4011BE
£0.326
Each (In a Tube of 25)
Units
NAND Through Hole 4 2 No PDIP 14 4000 - 18 V -4.2mA 120 ns @ 10 V, 250 ns @ 5 V, 90 ns @ 15 V 3 V 4.2mA
RS Stock No. 121-8348
Mfr. Part No.CD4011BE
£0.326
Each (In a Tube of 25)
Units
NAND Through Hole 4 2 - PDIP 14 4000 - 18 V -4.2mA 120 ns @ 10 V, 250 ns @ 5 V, 90 ns @ 15 V 3 V 4.2mA
RS Stock No. 442-909
Mfr. Part No.SN74HC02N
£0.41
Each
Units
NOR 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. 923-2477
Mfr. Part No.SN74HC02N
£0.238
Each (In a Tube of 25)
Units
NOR 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. 923-2335
Mfr. Part No.SN74LS08N
£0.419
Each (In a Tube of 25)
Units
AND Through Hole 4 2 No PDIP 14 LS - 5.25 V -0.4mA 20 ns @ 5 V 4.75 V 8mA
RS Stock No. 122-1486
Mfr. Part No.74LVC1G04Z-7
£0.06
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. 770-5327
Mfr. Part No.74LVC1G04Z-7
£0.081
Each (In a Pack of 50)
Units
NOT Surface Mount 1 - - SOT-553 5 LVC CMOS 5.5 V -32mA 7 ns @ 2.7 V 1.65 V 32mA
RS Stock No. 923-2341
Mfr. Part No.SN74LS32N
£0.39
Each (In a Tube of 25)
Units
OR Through Hole 4 2 No PDIP 14 LS - 5.25 V -0.4mA 22 ns @ 5 V 4.75 V 8mA
RS Stock No. 541-9673
Mfr. Part No.TC4081BP(F)
BrandToshiba
£0.286
Each (In a Pack of 5)
Units
AND Through Hole 4 2 No PDIP 14 4000 - 18 V -4mA 100 ns @ 10 V, 200 ns @ 5 V, 80 ns @ 15 V 3 V 4mA
RS Stock No. 580-878
Mfr. Part No.TC4093BP(N,F)
BrandToshiba
£0.484
Each (In a Pack of 5)
Units
NAND Through Hole 4 2 Yes PDIP 14 4000 Schmitt Trigger 18 V -4mA 120 ns @ 10 V, 260 ns @ 5 V, 80 ns @ 15 V 3 V 4mA
RS Stock No. 178-7128
Mfr. Part No.74LVC1G08GW,125
BrandNexperia
£0.023
Each (On a Reel of 3000)
Units
AND Surface Mount 1 2 No TSSOP 5 LVC - 5.5 V -32mA - 1.65 V 32mA
RS Stock No. 510-201
Mfr. Part No.74LVC1G08GW,125
BrandNexperia
£0.106
Each (In a Pack of 50)
Units
AND Surface Mount 1 2 No TSSOP 5 LVC - 5.5 V -32mA - 1.65 V 32mA
RS Stock No. 124-2313
Mfr. Part No.HEF4093BT,652
BrandNexperia
£0.263
Each (In a Tube of 57)
Units
NAND Surface Mount 4 2 Yes SOIC 14 4000 Schmitt Trigger 15 V -4.2mA 185 ns @ 5 V, 60 ns @ 15 V, 80 ns @ 10 V 3 V 4.2mA
RS Stock No. 355-9167
Mfr. Part No.HEF4093BT,652
BrandNexperia
£0.36
Each
Units
NAND Surface Mount 4 2 Yes SOIC 14 4000 Schmitt Trigger 15 V -4.2mA 185 ns @ 5 V, 60 ns @ 15 V, 80 ns @ 10 V 3 V 4.2mA
RS Stock No. 170-7964
Mfr. Part No.HEF4093BT,653
BrandNexperia
£0.078
Each (On a Reel of 2500)
Units
NAND Surface Mount 4 2 Yes SO 14 HEF Schmitt Trigger 15 V -4.2mA 185 ns @ 50 pF 3 V 4.2mA
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