# 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

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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
 New RS Stock No. 333-2748 Mfr. Part No.SN74HC00N BrandTexas Instruments Compare SGD0.47 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 New RS Stock No. 368-5884 Mfr. Part No.SN74LS00N BrandTexas Instruments Compare SGD0.781 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 New RS Stock No. 145-0402 Mfr. Part No.SN74HCT00N BrandTexas Instruments Compare SGD0.43 Each (In a Tube of 25) units NAND Through Hole 4 2 No PDIP 14 HCT - 5.5 V -4mA 18 ns @ 5.5 V, 20 ns @ 4.5 V 4.5 V 4mA New RS Stock No. 217-5702 Mfr. Part No.SN74HCT00N BrandTexas Instruments Compare SGD0.70 Each units NAND Through Hole 4 2 No PDIP 14 HCT - 5.5 V -4mA 18 ns @ 5.5 V, 20 ns @ 4.5 V 4.5 V 4mA New RS Stock No. 761-4498 Mfr. Part No.MM74HC32MX BrandON Semiconductor Compare SGD0.581 Each (In a Pack of 25) units OR Surface Mount 4 2 No SOIC 14 HC CMOS 6 V 5.2mA 125ns 2 V 5.2mA New RS Stock No. 166-2761 Mfr. Part No.MM74HC32MX BrandON Semiconductor Compare SGD0.289 Each (On a Reel of 2500) units OR Surface Mount 4 2 No SOIC 14 HC CMOS 6 V 5.2mA 125ns 2 V 5.2mA New RS Stock No. 806-3217 Mfr. Part No.MC14070BDG BrandON Semiconductor Compare SGD0.393 Each (In a Pack of 55) units XOR Surface Mount 4 2 No SOIC 14 4000 - 18 V -10mA 150ns 3 V 10mA New RS Stock No. 518-8650 Mfr. Part No.MC14011BDG BrandON Semiconductor Compare SGD0.56 Each units NAND Surface Mount 4 2 No SOIC 14 4000 - 18 V -4.2mA 100 ns @ 10 V, 250 ns @ 5 V, 80 ns @ 15 V 3 V 4.2mA New RS Stock No. 100-0761 Mfr. Part No.SN74HC32N BrandTexas Instruments Compare SGD0.419 Each (In a Tube of 25) units OR Through Hole 4 2 No PDIP 14 HC - 6 V -5.2mA 100 ns @ 2 V, 17 ns @ 6 V, 20 ns @ 4.5 V 2 V 5.2mA New RS Stock No. 796-8228 Mfr. Part No.SN74LVC1G00DCKR BrandTexas Instruments Compare SGD0.214 Each (On a Tape of 50) units NAND Surface Mount 1 2 No SC-70 5 LVC CMOS, TTL 5.5 V -32mA 4.3 ns @ 5 V 1.65 V 32mA New RS Stock No. 217-5645 Mfr. Part No.SN74HC32N BrandTexas Instruments Compare SGD0.58 Each units OR Through Hole 4 2 No PDIP 14 HC - 6 V -5.2mA 100 ns @ 2 V, 17 ns @ 6 V, 20 ns @ 4.5 V 2 V 5.2mA New RS Stock No. 806-3119 Mfr. Part No.MC14011BDR2G BrandON Semiconductor Compare SGD0.398 Each (On a Tape of 50) units NAND Surface Mount 4 2 No SOIC 14 4000 - 18 V -10mA 250 ns @ 50 pF 3 V 10mA New RS Stock No. 103-2710 Mfr. Part No.MC14011BDG BrandON Semiconductor Compare SGD0.427 Each (In a Tube of 55) units NAND Surface Mount 4 2 No SOIC 14 4000 - 18 V -4.2mA 100 ns @ 10 V, 250 ns @ 5 V, 80 ns @ 15 V 3 V 4.2mA New RS Stock No. 170-3567 Mfr. Part No.MC14011BDR2G BrandON Semiconductor Compare SGD0.172 Each (On a Reel of 2500) units NAND Surface Mount 4 2 No SOIC 14 4000 - 18 V -10mA 250 ns @ 50 pF 3 V 10mA New RS Stock No. 168-4235 Mfr. Part No.SN74LVC1G00DCKR BrandTexas Instruments Compare SGD0.059 Each (On a Reel of 3000) units NAND Surface Mount 1 2 No SC-70 5 LVC CMOS, TTL 5.5 V -32mA 4.3 ns @ 5 V 1.65 V 32mA New RS Stock No. 178-7127 Mfr. Part No.74LVC1G02GW,125 BrandNexperia Compare SGD0.046 Each (On a Reel of 3000) units NOR Surface Mount 1 2 No TSSOP 5 LVC - 5.5 V -32mA - 1.65 V 32mA New RS Stock No. 739-0098 Mfr. Part No.NC7WZ16P6X BrandON Semiconductor Compare SGD0.33 Each (In a Pack of 10) units - - - - - - - - - - - - - - New RS Stock No. 510-122 Mfr. Part No.74LVC1G02GW,125 BrandNexperia Compare SGD0.205 Each (In a Pack of 50) units NOR Surface Mount 1 2 No TSSOP 5 LVC - 5.5 V -32mA - 1.65 V 32mA New RS Stock No. 806-2365 Mfr. Part No.MC74HC00ADTR2G BrandON Semiconductor Compare SGD0.356 Each (On a Tape of 50) units NAND Surface Mount 4 2 No TSSOP 14 LS CMOS 6 V 5.2mA 110 ns @ 50 pF 2 V 5.2mA New RS Stock No. 368-5569 Mfr. Part No.SN7400N BrandTexas Instruments Compare SGD1.749 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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