# 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. 539-9282 Mfr. Part No.TC74HC08AP(F) BrandToshiba Compare £0.336 Each (In a Pack of 5) Units AND Through Hole 4 2 No PDIP 14 HC - 6 V -5.2mA 13 ns @ 6 V, 15 ns @ 4.5 V, 75 ns @ 2 V 2 V 5.2mA New RS Stock No. 307-496 Mfr. Part No.SN74LS02N BrandTexas Instruments Compare £0.49 Each Units NOR 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. 633-953 Mfr. Part No.CD74HCT32E BrandTexas Instruments Compare £0.43 Each Units OR Through Hole 4 2 No PDIP 14 HCT - 5.5 V -4mA 24 ns @ 4.5 V 4.5 V 4mA New RS Stock No. 333-4520 Mfr. Part No.CD74HCT32E BrandTexas Instruments Compare £0.358 Each (In a Tube of 25) Units OR Through Hole 4 2 No PDIP 14 HCT - 5.5 V -4mA 24 ns @ 4.5 V 4.5 V 4mA New RS Stock No. 709-2053 Mfr. Part No.CD4023BE BrandTexas Instruments Compare £0.314 Each (In a Pack of 20) Units NAND Through Hole 3 3 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. 144-9999 Mfr. Part No.CD4023BE BrandTexas Instruments Compare £0.313 Each (In a Tube of 25) Units NAND Through Hole 3 3 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. 145-0402 Mfr. Part No.SN74HCT00N BrandTexas Instruments Compare £0.271 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. 443-025 Mfr. Part No.SN74HC132N BrandTexas Instruments Compare £0.33 Each Units NAND Through Hole 4 2 Yes PDIP 14 HC Schmitt Trigger 6 V -5.2mA 120 ns @ 2 V, 21 ns @ 6 V, 25 ns @ 4.5 V 2 V 5.2mA New RS Stock No. 580-846 Mfr. Part No.TC4001BP(N,F) BrandToshiba Compare £0.31 Each (In a Pack of 5) Units NOR 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. 217-5702 Mfr. Part No.SN74HCT00N BrandTexas Instruments Compare £0.36 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. 333-2849 Mfr. Part No.SN74HC132N BrandTexas Instruments Compare £0.26 Each (In a Tube of 25) Units NAND Through Hole 4 2 Yes PDIP 14 HC Schmitt Trigger 6 V -5.2mA 120 ns @ 2 V, 21 ns @ 6 V, 25 ns @ 4.5 V 2 V 5.2mA New RS Stock No. 165-8350 Mfr. Part No.ULN2003V12S16-13 BrandDiodesZetex Compare £0.118 Each (On a Reel of 2500) Units - Surface Mount - - - SOIC 16 - CMOS 5 V - 140ns 3.3 V 140mA New RS Stock No. 921-0811 Mfr. Part No.ULN2003V12S16-13 BrandDiodesZetex Compare £0.29 Each (In a Pack of 30) Units - Surface Mount - - - SOIC 16 - CMOS 5 V - 140ns 3.3 V 140mA New RS Stock No. 709-1961 Mfr. Part No.CD4001BE BrandTexas Instruments Compare £0.327 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. 146-1976 Mfr. Part No.NC7WZ07P6X BrandON Semiconductor Compare £0.045 Each (On a Reel of 3000) Units - - - - - - - - - - - - - - New RS Stock No. 739-5190 Mfr. Part No.NC7WZ07P6X BrandON Semiconductor Compare £0.18 Each (In a Pack of 10) Units - - - - - - - - - - - - - - New RS Stock No. 169-8532 Mfr. Part No.NC7SZ08M5X BrandON Semiconductor Compare £0.057 Each (On a Reel of 3000) Units AND Surface Mount 1 2 No SOT-23 5 TinyLogic UHS - 5.5 V -32mA 4.5 ns @ 5 V, 5.2 ns @ 3.3 V 1.65 V 32mA New RS Stock No. 923-6699 Mfr. Part No.CD4001BE BrandTexas Instruments Compare £0.326 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. 670-9790 Mfr. Part No.NC7SZ08M5X BrandON Semiconductor Compare £0.223 Each (In a Pack of 10) Units AND Surface Mount 1 2 No SOT-23 5 TinyLogic UHS - 5.5 V -32mA 4.5 ns @ 5 V, 5.2 ns @ 3.3 V 1.65 V 32mA New RS Stock No. 145-0385 Mfr. Part No.SN74LS03N BrandTexas Instruments Compare £0.623 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
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