# 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. 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. 170-7993 Mfr. Part No.HEF4011BT,653 BrandNexperia Compare HK\$1.208 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. 662-7535 Mfr. Part No.SN74AC00DR BrandTexas Instruments Compare HK\$3.512 Each (In a Pack of 10) units NAND Surface Mount 4 2 No SOIC 14 AC - 6 V -24mA 8 ns @ 5 V, 9.5 ns @ 3.3 V 2 V 24mA New RS Stock No. 662-9521 Mfr. Part No.CD4011UBM BrandTexas Instruments Compare HK\$2.803 Each (In a Pack of 10) 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. 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. 518-9192 Mfr. Part No.MC14093BDG BrandON Semiconductor Compare HK\$3.59 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. 922-2909 Mfr. Part No.CD4093BM BrandTexas Instruments Compare HK\$3.922 Each (In a Tube of 50) units NAND Surface Mount 4 2 Yes SOIC 14 4000 Schmitt Trigger 18 V -4.2mA 130 ns @ 15 V, 180 ns @ 10 V, 380 ns @ 5 V 3 V 4.2mA New RS Stock No. 662-6819 Mfr. Part No.CD4011BM96 BrandTexas Instruments Compare HK\$3.477 Each (In a Pack of 10) 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. 662-8887 Mfr. Part No.SN74LVC2G00DCUT BrandTexas Instruments Compare HK\$7.406 Each (In a Pack of 5) 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. 145-0164 Mfr. Part No.SN74AHC08D BrandTexas Instruments Compare HK\$2.753 Each (In a Tube of 50) units AND Surface Mount 4 2 No SOIC 14 AHC - 5.5 V -8mA 7.9 ns @ 5 V, 12.3 ns @ 3.3 V 2 V 8mA New RS Stock No. 662-9571 Mfr. Part No.CD4023BM BrandTexas Instruments Compare HK\$3.451 Each (In a Pack of 10) units NAND Surface Mount 3 3 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. 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. 809-6179 Mfr. Part No.CD4023BMT BrandTexas Instruments Compare HK\$5.807 Each (In a Pack of 10) units NAND Surface Mount 3 3 No SOIC 14 4000 Differential 18 V -4.2mA 250 ns @ 50 pF 3 V 4.2mA New RS Stock No. 113-0130 Mfr. Part No.74HC32D,652 BrandNexperia Compare HK\$3.08 Each units OR 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. 671-1579 Mfr. Part No.74LCX08M BrandON Semiconductor Compare HK\$2.016 Each (In a Pack of 5) units AND Surface Mount 4 2 No SOIC 14 LCX - 3.6 V -24mA 5.5 ns @ 3.3 V, 6.2 ns @ 2.7 V 2 V 24mA New RS Stock No. 662-7096 Mfr. Part No.CD74HC30PWR BrandTexas Instruments Compare HK\$2.657 Each (In a Pack of 10) units NAND Surface Mount 1 8 No TSSOP 14 HC - 6 V -5.2mA 22 ns @ 6 V, 26 ns @ 4.5 V, 130 ns @ 2 V 2 V 5.2mA New RS Stock No. 662-6649 Mfr. Part No.74LVC1G3208DBVR BrandTexas Instruments Compare HK\$2.04 Each (In a Pack of 10) 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. 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. 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. 921-0815 Mfr. Part No.ULN2003V12T16-13 BrandDiodesZetex Compare HK\$3.286 Each (In a Pack of 30) units - Surface Mount - - - TSSOP 16 - CMOS 5 V - 140ns 3.3 V 140mA
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