# 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. 145-5920 Mfr. Part No.SN74LS33N BrandTexas Instruments Compare HK\$11.777 Each (In a Tube of 25) units NOR Through Hole 4 2 No PDIP 14 LS - 5.25 V -0.25mA 32 ns @ 5 V 4.75 V 24mA New RS Stock No. 775-7784 Mfr. Part No.74HCT1G32GW,125 BrandNexperia Compare HK\$2.039 Each (In a Bag of 30) units OR Surface Mount 1 2 No TSSOP 5 HCT TTL 5.5 V -2mA 27ns 4.5 V 2mA New RS Stock No. 510-201 Mfr. Part No.74LVC1G08GW,125 BrandNexperia Compare HK\$1.282 Each (In a Pack of 50) units AND Surface Mount 1 2 No TSSOP 5 LVC - 5.5 V -32mA - 1.65 V 32mA New RS Stock No. 178-4794 Mfr. Part No.MC14081BDG BrandON Semiconductor Compare HK\$3.85 Each (In a Tube of 55) units AND Surface Mount 4 2 No SOIC 14 4000 - 18 V -4.2mA 100 ns @ 15 V, 130 ns @ 10 V, 300 ns @ 5 V 3 V 4.2mA New RS Stock No. 178-7128 Mfr. Part No.74LVC1G08GW,125 BrandNexperia Compare HK\$0.315 Each (On a Reel of 3000) units AND Surface Mount 1 2 No TSSOP 5 LVC - 5.5 V -32mA - 1.65 V 32mA New RS Stock No. 305-181 Mfr. Part No.SN74LS33N BrandTexas Instruments Compare HK\$13.58 Each units NOR Through Hole 4 2 No PDIP 14 LS - 5.25 V -0.25mA 32 ns @ 5 V 4.75 V 24mA New RS Stock No. 170-3418 Mfr. Part No.MC14081BDR2G BrandON Semiconductor Compare HK\$0.958 Each (On a Reel of 2500) units AND Surface Mount 4 2 No SOIC 14 4000 - 18 V -4.2mA 100 ns @ 15 V, 130 ns @ 10 V, 300 ns @ 5 V 3 V 4.2mA New RS Stock No. 518-9164 Mfr. Part No.MC14081BDG BrandON Semiconductor Compare HK\$4.49 Each units AND Surface Mount 4 2 No SOIC 14 4000 - 18 V -4.2mA 100 ns @ 15 V, 130 ns @ 10 V, 300 ns @ 5 V 3 V 4.2mA New RS Stock No. 688-1521 Mfr. Part No.MC14081BDR2G BrandON Semiconductor Compare HK\$3.698 Each (In a Pack of 5) units AND Surface Mount 4 2 No SOIC 14 4000 - 18 V -4.2mA 100 ns @ 15 V, 130 ns @ 10 V, 300 ns @ 5 V 3 V 4.2mA New RS Stock No. 146-0843 Mfr. Part No.74HCT1G32GW,125 BrandNexperia Compare HK\$0.458 Each (On a Reel of 3000) units OR Surface Mount 1 2 No TSSOP 5 HCT TTL 5.5 V -2mA 27ns 4.5 V 2mA New RS Stock No. 526-537 Mfr. Part No.CD4011BE BrandTexas Instruments Compare HK\$4.252 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 New RS Stock No. 662-7550 Mfr. Part No.SN74AC08DR BrandTexas Instruments Compare HK\$3.05 Each (In a Pack of 10) units AND Surface Mount 4 2 No SOIC 14 AC - 6 V -24mA 7.5 ns @ 5 V, 9.5 ns @ 3.3 V 2 V 24mA New RS Stock No. 121-8348 Mfr. Part No.CD4011BE BrandTexas Instruments Compare HK\$4.252 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 New RS Stock No. 179-2125 Mfr. Part No.SN74AC08DR BrandTexas Instruments Compare HK\$3.08 Each (In a Tube of 50) units AND Surface Mount 4 2 No SOIC 14 AC - 6 V -24mA 7.5 ns @ 5 V, 9.5 ns @ 3.3 V 2 V 24mA New RS Stock No. 671-1848 Mfr. Part No.MM74HCT32MX BrandON Semiconductor Compare HK\$3.883 Each (In a Pack of 10) units OR Surface Mount 4 2 No SOIC 14 HCT - 5.5 V -4.8mA 20 ns @ 5 V 4.5 V 4.8mA New RS Stock No. 662-9666 Mfr. Part No.CD4077BE BrandTexas Instruments Compare HK\$4.534 Each (In a Pack of 5) units XNOR Through Hole 4 2 No PDIP 14 4000 - 18 V -4.2mA 100 ns @ 15 V, 130 ns @ 10 V, 280 ns @ 5 V 3 V 4.2mA New RS Stock No. 144-9938 Mfr. Part No.CD4077BE BrandTexas Instruments Compare HK\$2.621 Each (In a Tube of 25) units XNOR Through Hole 4 2 No PDIP 14 4000 - 18 V -4.2mA 100 ns @ 15 V, 130 ns @ 10 V, 280 ns @ 5 V 3 V 4.2mA New RS Stock No. 166-2397 Mfr. Part No.MM74HCT32MX BrandON Semiconductor Compare HK\$1.953 Each (On a Reel of 2500) units OR Surface Mount 4 2 No SOIC 14 HCT - 5.5 V -4.8mA 20 ns @ 5 V 4.5 V 4.8mA New RS Stock No. 923-6801 Mfr. Part No.CD4011UBE BrandTexas Instruments Compare HK\$4.158 Each (In a Tube of 25) units NAND Through Hole 4 2 No PDIP 14 4000 - 18 V -4.2mA 50 ns @ 15 V, 60 ns @ 10 V, 120 ns @ 5 V 3 V 4.2mA New RS Stock No. 162-6972 Mfr. Part No.CD74HCT21M96 BrandTexas Instruments Compare HK\$0.987 Each (On a Reel of 2500) units AND Surface Mount 2 4 No SOIC 14 HCT - 5.5 V -4mA 27 ns @ 4.5 V 4.5 V 4mA
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