# 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. 923-6699 Mfr. Part No.CD4001BE BrandTexas Instruments Compare \$0.721 Each (In a Tube of 25) units NOR 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 New RS Stock No. 739-0091 Mfr. Part No.NC7SZ32M5X BrandON Semiconductor Compare \$0.388 Each (In a Pack of 10) units OR Surface Mount 1 2 No SOT-23 5 TinyLogic UHS CMOS 5.5 V -32mA 5.5ns 1.65 V 32mA New RS Stock No. 709-1961 Mfr. Part No.CD4001BE BrandTexas Instruments Compare \$0.588 Each (In a Pack of 20) units NOR 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 New RS Stock No. 169-8554 Mfr. Part No.NC7SZ32M5X BrandON Semiconductor Compare \$0.099 Each (On a Reel of 3000) units OR Surface Mount 1 2 No SOT-23 5 TinyLogic UHS CMOS 5.5 V -32mA 5.5ns 1.65 V 32mA New RS Stock No. 709-2968 Mfr. Part No.CD4011UBE BrandTexas Instruments Compare \$0.703 Each (In a Pack of 10) units NAND Through Hole 4 2 No PDIP 14 4000 - 18 V -4.2mA 120 ns @ 5 V, 50 ns @ 15 V, 60 ns @ 10 V 3 V 4.2mA New RS Stock No. 923-6801 Mfr. Part No.CD4011UBE BrandTexas Instruments Compare \$0.703 Each (In a Tube of 25) units NAND Through Hole 4 2 No PDIP 14 4000 - 18 V -4.2mA 120 ns @ 5 V, 50 ns @ 15 V, 60 ns @ 10 V 3 V 4.2mA New RS Stock No. 100-0760 Mfr. Part No.SN74HC08N BrandTexas Instruments Compare \$0.693 Each (In a Tube of 25) units AND 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. 121-8309 Mfr. Part No.SN74HC86N BrandTexas Instruments Compare \$0.49 Each (In a Tube of 25) units XOR Through Hole 4 2 - 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. 442-993 Mfr. Part No.SN74HC86N BrandTexas Instruments Compare \$0.70 Each units XOR 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. 770-5327 Mfr. Part No.74LVC1G04Z-7 BrandDiodesZetex Compare \$0.506 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 New RS Stock No. 122-1486 Mfr. Part No.74LVC1G04Z-7 BrandDiodesZetex Compare \$0.109 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 New RS Stock No. 526-537 Mfr. Part No.CD4011BE BrandTexas Instruments Compare \$0.674 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 New RS Stock No. 739-0127 Mfr. Part No.NC7SZ00M5X BrandON Semiconductor Compare \$0.434 Each (In a Pack of 10) units NAND Surface Mount 1 2 No SOT-23 5 TinyLogic UHS CMOS 5.5 V -32mA 5.2ns 1.65 V 32mA New RS Stock No. 368-6203 Mfr. Part No.SN74LS21N BrandTexas Instruments Compare \$0.968 Each (In a Tube of 25) units AND Through Hole 2 4 No PDIP 14 LS - 5.25 V -0.4mA 20 ns @ 5 V 4.75 V 8mA New RS Stock No. 166-2410 Mfr. Part No.NC7SZ00M5X BrandON Semiconductor Compare \$0.111 Each (On a Reel of 3000) units NAND Surface Mount 1 2 No SOT-23 5 TinyLogic UHS CMOS 5.5 V -32mA 5.2ns 1.65 V 32mA New RS Stock No. 121-8348 Mfr. Part No.CD4011BE BrandTexas Instruments Compare \$0.674 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 New RS Stock No. 922-2892 Mfr. Part No.CD4001UBE BrandTexas Instruments Compare \$0.574 Each (In a Tube of 25) units NOR Through Hole 4 2 No PDIP 14 4000 - 18 V -4.2mA 120 ns @ 5 V, 50 ns @ 15 V, 60 ns @ 10 V 3 V 4.2mA New RS Stock No. 922-2909 Mfr. Part No.CD4093BM BrandTexas Instruments Compare \$0.588 Each (In a Tube of 50) units NAND Surface Mount 4 2 Yes SOIC 14 4000 Schmitt Trigger 18 V -4.2mA 130 ns @ 15 V, 180 ns @ 10 V, 380 ns @ 5 V 3 V 4.2mA New RS Stock No. 756-3031 Mfr. Part No.TC74VCX00FK(EL) BrandToshiba Compare \$1.006 Each (In a Pack of 5) units NAND Surface Mount 4 2 No VSSOP 14 VCX CMOS 3.6 V +24mA 7.4ns 1.2 V -24mA New RS Stock No. 166-0006 Mfr. Part No.74HC2G08DP,125 BrandNexperia Compare \$0.188 Each (On a Reel of 3000) units AND Surface Mount 2 2 No TSSOP 8 HC CMOS 6 V -5.2mA 110 ns @ 15 pF 2 V 5.2mA
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