# 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. 145-0385 Mfr. Part No.SN74LS03N BrandTexas Instruments Compare £0.61 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 New RS Stock No. 541-9544 Mfr. Part No.TC4011BP(F) BrandToshiba Compare £0.286 Each (In a Pack of 5) Units NAND 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. 307-604 Mfr. Part No.SN74LS86AN BrandTexas Instruments Compare £1.62 Each Units XOR Through Hole 4 2 No PDIP 14 LS - 5.25 V -0.4mA 30 ns @ 5 V 4.75 V 8mA New RS Stock No. 787-369 Mfr. Part No.HEF4011BT,652 BrandNexperia Compare £0.344 Each (In a Pack of 5) Units NAND Surface Mount 4 2 No SOIC 14 4000 - 15 V -3.6mA 110 ns @ 5 V, 35 ns @ 15 V, 45 ns @ 10 V 3 V 3.6mA New RS Stock No. 305-232 Mfr. Part No.SN74LS09N BrandTexas Instruments Compare £0.73 Each Units AND Through Hole 4 2 No PDIP 14 LS - 5.25 V -0.1mA 35 ns @ 5 V 4.75 V 8mA New RS Stock No. 539-9377 Mfr. Part No.TC74HC32AP(F) BrandToshiba Compare £0.238 Each (In a Pack of 5) Units OR 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. 145-0382 Mfr. Part No.SN74LS09N BrandTexas Instruments Compare £0.61 Each (In a Tube of 25) Units AND Through Hole 4 2 No PDIP 14 LS - 5.25 V -0.1mA 35 ns @ 5 V 4.75 V 8mA New RS Stock No. 170-7993 Mfr. Part No.HEF4011BT,653 BrandNexperia Compare £0.053 Each (On a Reel of 2500) Units NAND Surface Mount 4 2 - SO 14 HEF CMOS 15 V -4.2mA 110 ns @ 50 pF 3 V 4.2mA New RS Stock No. 103-8153 Mfr. Part No.HEF4011BT,652 BrandNexperia Compare £0.266 Each (In a Tube of 57) Units NAND Surface Mount 4 2 No SOIC 14 4000 - 15 V -3.6mA 110 ns @ 5 V, 35 ns @ 15 V, 45 ns @ 10 V 3 V 3.6mA New RS Stock No. 144-9972 Mfr. Part No.SN74HC11NE4 BrandTexas Instruments Compare £0.149 Each (In a Tube of 25) Units AND Through Hole 3 3 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. 663-1906 Mfr. Part No.SN74HC11NE4 BrandTexas Instruments Compare £0.231 Each (In a Pack of 10) Units AND Through Hole 3 3 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. 103-8165 Mfr. Part No.74HC00D,652 BrandNexperia Compare £0.224 Each (In a Tube of 57) Units NAND Surface Mount 4 2 No SOIC 14 HC - 6 V -5.2mA - 2 V 5.2mA New RS Stock No. 709-2059 Mfr. Part No.CD4073BEE4 BrandTexas Instruments Compare £0.369 Each (In a Pack of 20) Units AND 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. 145-0000 Mfr. Part No.CD4073BE BrandTexas Instruments Compare £0.184 Each (In a Tube of 25) Units AND 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. 170-7969 Mfr. Part No.74HC00D,653 BrandNexperia Compare £0.046 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. 527-441 Mfr. Part No.CD4030BE BrandTexas Instruments Compare £0.30 Each (In a Tube of 25) Units XOR Through Hole 4 2 No PDIP 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. 166-1966 Mfr. Part No.NC7SZ86M5X BrandON Semiconductor Compare £0.061 Each (On a Reel of 3000) Units XOR Surface Mount 1 2 No SOT-23 5 TinyLogic UHS - 5.5 V -32mA 5.4 ns @ 5 V, 6.2 ns @ 3.3 V 1.65 V 32mA New RS Stock No. 761-4561 Mfr. Part No.NC7SZ86M5X BrandON Semiconductor Compare £0.207 Each (In a Pack of 25) Units OR Surface Mount 1 2 No SOT-23 5 - CMOS 5.5 V -32mA 6.5ns 1.65 V 32mA New RS Stock No. 923-2357 Mfr. Part No.SN74LS86AN BrandTexas Instruments Compare £0.39 Each (In a Tube of 25) Units XOR Through Hole 4 2 No PDIP 14 LS - 5.25 V -0.4mA 30 ns @ 5 V 4.75 V 8mA New RS Stock No. 145-5974 Mfr. Part No.SN74AHC1G00DCKR BrandTexas Instruments Compare £0.027 Each (On a Reel of 3000) Units NAND Surface Mount 1 2 No SC-70 5 AHC - 5.5 V -8mA 11.4 ns @ 3.3 V, 7.5 ns @ 5 V 2 V 8mA
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