# 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 £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 New RS Stock No. 368-5884 Mfr. Part No.SN74LS00N BrandTexas Instruments Compare £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 New RS Stock No. 527-384 Mfr. Part No.SN74HC00DR BrandTexas Instruments Compare £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 New RS Stock No. 526-234 Mfr. Part No.SN74HC00D BrandTexas Instruments Compare £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 New RS Stock No. 168-4861 Mfr. Part No.SN74HC00DR BrandTexas Instruments Compare £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 New RS Stock No. 526-537 Mfr. Part No.CD4011BE BrandTexas Instruments Compare £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 New RS Stock No. 121-8348 Mfr. Part No.CD4011BE BrandTexas Instruments Compare £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 New RS Stock No. 442-909 Mfr. Part No.SN74HC02N BrandTexas Instruments Compare £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 New RS Stock No. 923-2477 Mfr. Part No.SN74HC02N BrandTexas Instruments Compare £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 New RS Stock No. 923-2335 Mfr. Part No.SN74LS08N BrandTexas Instruments Compare £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 New RS Stock No. 122-1486 Mfr. Part No.74LVC1G04Z-7 BrandDiodesZetex Compare £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 New RS Stock No. 770-5327 Mfr. Part No.74LVC1G04Z-7 BrandDiodesZetex Compare £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 New RS Stock No. 923-2341 Mfr. Part No.SN74LS32N BrandTexas Instruments Compare £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 New RS Stock No. 541-9673 Mfr. Part No.TC4081BP(F) BrandToshiba Compare £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 New RS Stock No. 580-878 Mfr. Part No.TC4093BP(N,F) BrandToshiba Compare £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 New RS Stock No. 178-7128 Mfr. Part No.74LVC1G08GW,125 BrandNexperia Compare £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 New RS Stock No. 510-201 Mfr. Part No.74LVC1G08GW,125 BrandNexperia Compare £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 New RS Stock No. 124-2313 Mfr. Part No.HEF4093BT,652 BrandNexperia Compare £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 New RS Stock No. 355-9167 Mfr. Part No.HEF4093BT,652 BrandNexperia Compare £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 New RS Stock No. 170-7964 Mfr. Part No.HEF4093BT,653 BrandNexperia Compare £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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