# 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. 103-8153 Mfr. Part No.HEF4011BT,652 BrandNexperia Compare HK\$3.438 Each (In a Tube of 57) units NAND Surface Mount 4 2 No SOIC 14 4000 - 15 V -3.6mA 35 ns @ 15 V, 45 ns @ 10 V, 110 ns @ 5 V 3 V 3.6mA New RS Stock No. 162-7461 Mfr. Part No.SN74LVC1G08QDCKRQ1 BrandTexas Instruments Compare HK\$0.943 Each (On a Reel of 3000) units AND Surface Mount 1 2 No SC-70 5 LVC - 5.5 V -32mA 6 ns @ 5 V, 6.5 ns @ 3.3 V 1.65 V 32mA New RS Stock No. 179-2116 Mfr. Part No.CD4011BM96 BrandTexas Instruments Compare HK\$3.921 Each (In a Tube of 50) units NAND Surface Mount 4 2 No SOIC 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. 540-8134 Mfr. Part No.TC74HC32AF(F) BrandToshiba Compare HK\$2.46 Each (In a Pack of 5) units OR Surface Mount 4 2 No SOP 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. 165-8729 Mfr. Part No.74LVC2G08DC,125 BrandNexperia Compare HK\$2.061 Each (On a Reel of 3000) units AND Surface Mount 2 2 No VSSOP 8 LVC TTL 5.5 V -32mA 6.7 ns @ 50 pF 1.65 V 32mA New RS Stock No. 163-0500 Mfr. Part No.MC10EL04DG BrandON Semiconductor Compare HK\$51.289 Each (In a Tube of 98) units AND/NAND Surface Mount 1 2 No SOIC 8 ECL ECL 5.7 V - 395ps -4.2 V 0.3µA New RS Stock No. 923-2341 Mfr. Part No.SN74LS32N BrandTexas Instruments Compare HK\$5.094 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. 145-7375 Mfr. Part No.SN74LVC2G00DCUT BrandTexas Instruments Compare HK\$5.52 Each (On a Reel of 250) units NAND Surface Mount 2 2 No VSSOP 8 LVC - 5.5 V -32mA 3.3 ns @ 5 V, 4.3 ns @ 3.3 V 1.65 V 32mA New RS Stock No. 162-6871 Mfr. Part No.74LVC1G3208DBVR BrandTexas Instruments Compare HK\$0.793 Each (On a Reel of 3000) units Multifunction Surface Mount 1 3 No SOT-23 6 LVC - 5.5 V -32mA 4 ns @ 5 V, 5.9 ns @ 3.3 V 1.65 V 32mA New RS Stock No. 663-1215 Mfr. Part No.SN74AHCT02D BrandTexas Instruments Compare HK\$1.342 Each (In a Pack of 10) units NOR Surface Mount 4 2 No SOIC 14 AHCT - 5.5 V -8mA 7.5 ns @ 5 V 4.5 V 8mA New RS Stock No. 368-5884 Mfr. Part No.SN74LS00N BrandTexas Instruments Compare HK\$5.354 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. 540-0512 Mfr. Part No.TC7S32F(F) BrandToshiba Compare HK\$2.184 Each (In a Pack of 5) units OR Surface Mount 1 2 No SSOP 5 HC - 6 V -2.6mA 17 ns @ 6 V, 20 ns @ 4.5 V, 100 ns @ 2 V 2 V 2.6mA New RS Stock No. 518-9192 Mfr. Part No.MC14093BDG BrandON Semiconductor Compare HK\$3.52 Each units NAND Surface Mount 4 2 Yes SOIC 14 4000 Schmitt Trigger 18 V -4.2mA 80 ns @ 15 V, 100 ns @ 10 V, 250 ns @ 5 V 3 V 4.2mA New RS Stock No. 162-7492 Mfr. Part No.SN74LVC2G08DCTR BrandTexas Instruments Compare HK\$1.883 Each (On a Reel of 3000) units AND Surface Mount 2 2 No SSOP 8 LVC - 5.5 V -32mA 3.8 ns @ 5 V, 4.7 ns @ 3.3 V 1.65 V 32mA New RS Stock No. 662-8714 Mfr. Part No.SN74LVC1G08QDCKRQ1 BrandTexas Instruments Compare HK\$2.276 Each (In a Pack of 10) units AND Surface Mount 1 2 No SC-70 5 LVC - 5.5 V -32mA 6 ns @ 5 V, 6.5 ns @ 3.3 V 1.65 V 32mA New RS Stock No. 809-5801 Mfr. Part No.SN74HC32DT BrandTexas Instruments Compare HK\$4.458 Each (In a Pack of 10) units OR Surface Mount 4 2 No SOIC 14 HC Differential 6 V -4mA 125 ns @ 50 pF 2 V 5.2mA New RS Stock No. 162-9388 Mfr. Part No.MC14001BDR2G BrandON Semiconductor Compare HK\$1.125 Each (On a Reel of 2500) units NOR Surface Mount 4 2 No SOIC 14 4000 CMOS 18 V -4.2mA 350ns 0.5 V 4.2mA New RS Stock No. 816-8808 Mfr. Part No.74LVC2G08DC,125 BrandNexperia Compare HK\$2.802 Each (In a Pack of 10) units AND Surface Mount 2 2 No VSSOP 8 LVC TTL 5.5 V -32mA 6.7 ns @ 50 pF 1.65 V 32mA New RS Stock No. 145-0660 Mfr. Part No.CD4011UBM BrandTexas Instruments Compare HK\$3.451 Each (In a Tube of 50) units NAND Surface Mount 4 2 No SOIC 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. 791-6072 Mfr. Part No.MC14001BDR2G BrandON Semiconductor Compare HK\$2.925 Each (On a Tape of 25) units NOR Surface Mount 4 2 No SOIC 14 4000 CMOS 18 V -4.2mA 350ns 0.5 V 4.2mA
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