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. 308-203
Mfr. Part No.SN74LS11N
MYR3.07
Each
units
AND Through Hole 3 3 No PDIP 14 LS - 5.25 V -0.4mA 20 ns @ 5 V 4.75 V 8mA
RS Stock No. 145-0094
Mfr. Part No.SN74LS11N
MYR1.579
Each (In a Tube of 25)
units
AND Through Hole 3 3 No PDIP 14 LS - 5.25 V -0.4mA 20 ns @ 5 V 4.75 V 8mA
RS Stock No. 368-5884
Mfr. Part No.SN74LS00N
MYR3.738
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. 305-232
Mfr. Part No.SN74LS09N
MYR3.81
Each
units
AND Through Hole 4 2 No PDIP 14 LS - 5.25 V -0.1mA 35 ns @ 5 V 4.75 V 8mA
RS Stock No. 145-0382
Mfr. Part No.SN74LS09N
MYR2.234
Each (In a Tube of 25)
units
AND Through Hole 4 2 No PDIP 14 LS - 5.25 V -0.1mA 35 ns @ 5 V 4.75 V 8mA
RS Stock No. 145-0384
Mfr. Part No.SN74LS20N
MYR2.234
Each (In a Tube of 25)
units
NAND Through Hole 2 4 No PDIP 14 LS - 5.25 V -0.4mA 15 ns @ 5 V 4.75 V 8mA
RS Stock No. 307-553
Mfr. Part No.SN74LS20N
MYR3.81
Each
units
NAND Through Hole 2 4 No PDIP 14 LS - 5.25 V -0.4mA 15 ns @ 5 V 4.75 V 8mA
RS Stock No. 309-060
Mfr. Part No.SN74LS27N
MYR4.27
Each
units
NOR Through Hole 3 3 No PDIP 14 LS - 5.25 V -0.4mA 15 ns @ 5 V 4.75 V 8mA
RS Stock No. 442-909
Mfr. Part No.SN74HC02N
MYR1.86
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
MYR1.381
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. 309-048
Mfr. Part No.SN74LS03N
MYR3.60
Each
units
NAND Through Hole 4 2 No PDIP 14 LS - 5.25 V -0.1mA 32 ns @ 5 V 4.75 V 8mA
RS Stock No. 923-2335
Mfr. Part No.SN74LS08N
MYR2.10
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. 145-0385
Mfr. Part No.SN74LS03N
MYR2.234
Each (In a Tube of 25)
units
NAND Through Hole 4 2 No PDIP 14 LS - 5.25 V -0.1mA 32 ns @ 5 V 4.75 V 8mA
RS Stock No. 527-514
Mfr. Part No.SN74HCT08N
MYR1.048
Each (In a Tube of 25)
units
AND Through Hole 4 2 No PDIP 14 HCT - 5.5 V -4mA 22 ns @ 5.5 V, 24 ns @ 4.5 V 4.5 V 4mA
RS Stock No. 662-8711
Mfr. Part No.SN74LVC1G08DCKT
MYR3.116
Each (In a Pack of 5)
units
AND Surface Mount 1 2 No SC-70 5 LVC - 5.5 V -32mA 4 ns @ 5 V, 4.5 ns @ 3.3 V 1.65 V 32mA
RS Stock No. 796-8231
Mfr. Part No.SN74LVC1G08DCKR
MYR0.458
Each (In a Pack of 25)
units
AND Surface Mount 1 2 No SC-70 5 LVC CMOS, TTL 5.5 V -32mA 5 ns @ 5 V 1.65 V 32mA
RS Stock No. 526-537
Mfr. Part No.CD4011BE
MYR1.03
Each (In a Tube of 25)
units
NAND Through Hole 4 2 No PDIP 14 4000 - 18 V -4.2mA 90 ns @ 15 V, 120 ns @ 10 V, 250 ns @ 5 V 3 V 4.2mA
RS Stock No. 121-9324
Mfr. Part No.SN74LVC1G08DCKR
MYR0.15
Each (On a Reel of 3000)
units
AND Surface Mount 1 2 - SC-70 5 LVC - 5.5 V -32mA 5 ns @ 5 V 1.65 V 32mA
RS Stock No. 121-8348
Mfr. Part No.CD4011BE
MYR1.598
Each (In a Tube of 25)
units
NAND Through Hole 4 2 - PDIP 14 4000 - 18 V -4.2mA 90 ns @ 15 V, 120 ns @ 10 V, 250 ns @ 5 V 3 V 4.2mA
RS Stock No. 368-5569
Mfr. Part No.SN7400N
MYR4.173
Each (In a Tube of 25)
units
NAND Through Hole 4 2 No PDIP 14 74 - 5.25 V -0.4mA 22 ns @ 5 V 4.75 V 16mA
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