# 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
• Full adders
• Half adders

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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. 756-3031 Mfr. Part No.TC74VCX00FK(EL) BrandToshiba Compare \$0.746 Each (In a Pack of 5) units NAND Surface Mount 4 2 No VSSOP 14 VCX CMOS 3.6 V +24mA 7.4ns 1.2 V -24mA New RS Stock No. 756-2996 Mfr. Part No.TC74LCX00F(K,F) BrandToshiba Compare \$0.392 Each (In a Pack of 10) units NAND Surface Mount 4 2 No SOP 14 LCX CMOS 3.6 V +50mA 6ns 2 V -50mA New RS Stock No. 756-3306 Mfr. Part No.TC7SZ08FE(TE85L,F) BrandToshiba Compare \$0.236 Each (In a Pack of 10) units AND Surface Mount 1 2 No SON 5 - CMOS 5.5 V +24mA 4.9ns 1.65 V -24mA New RS Stock No. 539-9204 Mfr. Part No.TC74HC00AP(F) BrandToshiba Compare \$0.78 Each (In a Pack of 5) units NAND 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. 465-2093 Mfr. Part No.TC74VHC00FT BrandToshiba Compare \$0.502 Each (In a Pack of 5) units NAND Surface Mount 4 2 No TSSOP 14 VHC - 5.5 V -8mA 11.4 ns @ 3.3 V, 7.5 ns @ 5 V 2 V 8mA New RS Stock No. 539-9282 Mfr. Part No.TC74HC08AP(F) BrandToshiba Compare \$0.73 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. 644-0151 Mfr. Part No.TC74AC08FT BrandToshiba Compare \$1.66 Each (In a Pack of 5) units AND Surface Mount 4 2 No TSSOP 14 AC - 5.5 V -24mA 7 ns @ 5 V, 9.8 ns @ 3.3 V 2 V 24mA New RS Stock No. 540-7563 Mfr. Part No.TC74HC00AF(F) BrandToshiba Compare \$0.264 Each (In a Pack of 5) units NAND 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. 539-9349 Mfr. Part No.TC74HC21AP(F) BrandToshiba Compare \$0.378 Each (In a Pack of 5) units AND Through Hole 2 4 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. 541-9673 Mfr. Part No.TC4081BP(F) BrandToshiba Compare \$1.392 Each (In a Pack of 5) units AND 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. 539-9377 Mfr. Part No.TC74HC32AP(F) BrandToshiba Compare \$0.532 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. 756-3062 Mfr. Part No.TC74VHC08F(K,F) BrandToshiba Compare \$0.423 Each (In a Pack of 10) units AND Surface Mount 4 2 No SOP 14 VHC CMOS 5.5 V +25mA 14ns 2 V -25mA New RS Stock No. 756-3056 Mfr. Part No.TC74VHC00F(K,F) BrandToshiba Compare \$0.366 Each (In a Pack of 10) units NAND Surface Mount 4 2 No SOP 14 VHC CMOS 5.5 V +25mA 13ns 2 V -25mA New RS Stock No. 540-6914 Mfr. Part No.TC7SH32FU(F) BrandToshiba Compare \$0.316 Each (In a Pack of 5) units OR Surface Mount 1 2 No SSOP 5 VHC - 5.5 V -8mA 11.4 ns @ 3.3 V, 7.5 ns @ 5 V 2 V 8mA New RS Stock No. 541-9544 Mfr. Part No.TC4011BP(F) BrandToshiba Compare \$1.232 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. 540-7119 Mfr. Part No.TC7W00FK(F) BrandToshiba Compare \$0.428 Each (In a Pack of 5) units NAND Surface Mount 2 2 No SSOP 8 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. 539-8425 Mfr. Part No.TC74AC02P(F) BrandToshiba Compare \$0.682 Each (In a Pack of 5) units NOR Through Hole 4 2 No PDIP 14 AC - 5.5 V -24mA 7 ns @ 5 V, 9.8 ns @ 3.3 V 2 V 24mA New RS Stock No. 896-6740 Mfr. Part No.TC7SH00FU,LJ(CT BrandToshiba Compare \$0.139 Each (In a Pack of 100) units NAND Surface Mount 1 2 No SSOP 5 VHC CMOS 5.5 V -8mA 13 ns @ 50 pF 2 V 8mA New RS Stock No. 531-6748 Mfr. Part No.TC4093BF(F) BrandToshiba Compare \$1.199 Each (In a Pack of 10) units NAND Surface Mount 4 2 Yes SOP 14 4000 Schmitt Trigger 18 V -4mA 120 ns @ 10 V, 260 ns @ 5 V, 80 ns @ 15 V 3 V 4mA New RS Stock No. 539-9490 Mfr. Part No.TC74HC132AP(F) BrandToshiba Compare \$1.00 Each (In a Pack of 5) units NAND Through Hole 4 2 Yes PDIP 14 HC Schmitt Trigger 6 V -5.2mA 110 ns @ 2 V, 19 ns @ 6 V, 22 ns @ 4.5 V 2 V 5.2mA