# 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. 709-2968 Mfr. Part No.CD4011UBE BrandTexas Instruments Compare kr 3,519 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 kr 3,525 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. 217-5702 Mfr. Part No.SN74HCT00N BrandTexas Instruments Compare kr 4,39 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. 145-0402 Mfr. Part No.SN74HCT00N BrandTexas Instruments Compare kr 3,003 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. 662-6853 Mfr. Part No.CD4070BM96 BrandTexas Instruments Compare kr 2,792 Each (In a Pack of 10) Units XOR Surface Mount 4 2 No SOIC 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. 816-8820 Mfr. Part No.74LVC2G32DC,125 BrandNexperia Compare kr 2,931 Each (In a Pack of 10) Units OR Surface Mount 2 2 No VSSOP 8 LVC TTL 5.5 V -32mA 6 ns @ 50 pF 1.65 V 32mA New RS Stock No. 709-2185 Mfr. Part No.CD4070BM BrandTexas Instruments Compare kr 3,899 Each (In a Pack of 20) Units XOR Surface Mount 4 2 No SOIC 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. 165-8730 Mfr. Part No.74LVC2G32DC,125 BrandNexperia Compare kr 2,607 Each (On a Reel of 3000) Units OR Surface Mount 2 2 No VSSOP 8 LVC TTL 5.5 V -32mA 6 ns @ 50 pF 1.65 V 32mA New RS Stock No. 162-8903 Mfr. Part No.M74VHC1GT08DTT1G BrandON Semiconductor Compare kr 0,459 Each (On a Reel of 3000) Units AND Surface Mount 1 2 No TSOP 5 VHC TTL 5.5 V -8mA 16.5 ns @ 50 pF 3 V 8mA New RS Stock No. 145-1087 Mfr. Part No.CD4070BM BrandTexas Instruments Compare kr 3,172 Each (In a Tube of 50) Units XOR Surface Mount 4 2 No SOIC 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. 739-5188 Mfr. Part No.NC7SZ57P6X BrandON Semiconductor Compare kr 2,323 Each (In a Pack of 10) Units Multifunction Surface Mount 2 2 Yes SC-70 6 TinyLogic UHS Schmitt Trigger 5.5 V -32mA 6.5ns 1.65 V 32mA New RS Stock No. 166-2414 Mfr. Part No.NC7SZ57P6X BrandON Semiconductor Compare kr 0,561 Each (On a Reel of 3000) Units Multifunction Surface Mount 2 2 Yes SC-70 6 TinyLogic UHS Schmitt Trigger 5.5 V -32mA 6.5ns 1.65 V 32mA New RS Stock No. 791-8841 Mfr. Part No.HEF4070BT,652 BrandNexperia Compare kr 2,723 Each (In a Pack of 38) Units OR Surface Mount 4 2 No SOIC 14 4000 CMOS 15 V - 50 ns @ 15 V 5 V - New RS Stock No. 805-1539 Mfr. Part No.M74VHC1GT08DTT1G BrandON Semiconductor Compare kr 0,856 Each (On a Tape of 100) Units AND Surface Mount 1 2 No TSOP 5 VHC TTL 5.5 V -8mA 16.5 ns @ 50 pF 3 V 8mA New RS Stock No. 178-7004 Mfr. Part No.HEF4070BT,652 BrandNexperia Compare kr 3,029 Each (In a Tube of 57) Units OR Surface Mount 4 2 No SOIC 14 4000 CMOS 15 V - 50 ns @ 15 V 5 V - New RS Stock No. 162-6924 Mfr. Part No.CD4070BM96 BrandTexas Instruments Compare kr 1,145 Each (On a Reel of 2500) Units XOR Surface Mount 4 2 No SOIC 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. 923-2335 Mfr. Part No.SN74LS08N BrandTexas Instruments Compare kr 4,638 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. 170-7969 Mfr. Part No.74HC00D,653 BrandNexperia Compare kr 0,538 Each (On a Reel of 2500) Units NAND Surface Mount 4 2 - SO 14 74HC CMOS 6 V -5.2mA 135 ns @ 50 pF 2 V 5.2mA New RS Stock No. 103-8171 Mfr. Part No.74HC125D,652 BrandNexperia Compare kr 2,192 Each (In a Tube of 57) Units Buffer, Line Driver Surface Mount - - No SOIC 14 HC Single Ended 6 V -7.8mA 100 ns @ 2 V 2 V 7.8mA New RS Stock No. 124-2313 Mfr. Part No.HEF4093BT,652 BrandNexperia Compare kr 3,192 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
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