The NOR gate is a digital logic gate that implements logical NOR - it behaves according to the truth table to the right. A HIGH output (1) results if both the inputs to the gate are LOW (0). If one or both input is HIGH (1), a LOW output (0) results. NOR is the result of the negation of the OR operator, thus forming a complete operation the combination of which can be combined to generate any other logical function. By contrast, the OR operator is monotonic as it can only change LOW to HIGH but not vice versa. A logic gate performs a logical operation on one or more logic inputs and produces a single logic output. ... NOR Logic Gate The logical NOR or joint denial is a boolean logic operator which produces a result that is the inverse of logical or. ... Negation (i. ... OR logic gate. ... OR logic gate. ...

The nor gate like a NAND gate is an universal gate in the sense that any boolean function can be implemented by nor gates. ...

In most, but not all, circuit implementations, the negation comes for free (e.g. CMOS) -- in some logic families (e.g. TTL) it is required and OR has to be implemented as a NOR followed by an inverter. A significant exception is some forms of domino logic. Static CMOS Inverter Complementary-symmetry/metal-oxide semiconductor (CMOS) (see-moss, IPA:), is a major class of integrated circuits. ... TTL is an elite band of men and boys that originate, live or are involved in the tadley bmx scene. ...

Symbols

There are two symbols for NOR gates: the American ('military') symbol and the IEC ('European' or 'rectangular') symbol. For more information see Logic Gate Symbols. A logic gate performs a logical operation on one or more logic inputs and produces a single logic output. ...

American NOR Symbol

IEC NOR Symbol

Image File history File links Nor-gate-en. ... Image File history File links Nor-gate-en. ... Image File history File links IEC_NOR.gif Summary Made in Smartdraw Licensing I, the creator of this work, hereby release it into the public domain. ...

Hardware Description and Pinout

NOR Gates are basic logic gates, and as such they are recognised in TTL and CMOS ICs. The standard, 4000 series, CMOS IC is the 4001, which includes four independent, two-input, NOR gates. The pinout diagram is as follows: TTL is an elite band of men and boys that originate, live or are involved in the tadley bmx scene. ... Static CMOS Inverter Complementary-symmetry/metal-oxide semiconductor (CMOS) (see-moss, IPA:), is a major class of integrated circuits. ... Integrated circuit showing memory blocks, logic and input/output pads around the periphery Microchips with a transparent window showing the integrated circuit inside. ...

Pinout Diagram of a 4001 Quad NOR DIL-format IC

1 Input A1 2 Input B1 3 Output Q1 4 Output Q2 5 Input B2 6 Input A2 7 VSS 8 Input A3 9 Input B3 10 Output Q3 11 Output Q4 12 Input B4 13 Input A4 14 VDD

Image File history File links No higher resolution available. ... Image File history File links No higher resolution available. ... IC in a DIP14-Package In microelectronics, a dual in-line package (DIP), sometimes called a DIL package, is an electronic device package with a rectangular housing and a row of electrical connecting pins along each of two opposite sides, usually the longer sides of the rectangle. ...

Availability

These devices are available from most semiconductor manufacturers such as Fairchild Semiconductor, Philips or Texas Instruments. These are usually available in both through-hole DIL and SOIC format. Datasheets are readily available in most datasheet databases. Fairchild Semiconductor introduced the first commercially available integrated circuit (although at almost the same time as one from Texas Instruments), and would go on to become one of the major players in the evolution of Silicon Valley in the 1960s. ... Philips HQ in Amsterdam Koninklijke Philips Electronics N.V. (Royal Philips Electronics N.V.), usually known as Philips, (Euronext: PHIA, NYSE: PHG) is one of the largest electronics companies in the world. ... Texas Instruments (NYSE: TXN), better known in the electronics industry (and popularly) as TI, is an American company based in Dallas, Texas, USA, renowned for developing and commercializing semiconductor and computer technology. ... IC in a DIP14-Package In microelectronics, a dual in-line package (DIP), sometimes called a DIL package, is an electronic device package with a rectangular housing and a row of electrical connecting pins along each of two opposite sides, usually the longer sides of the rectangle. ... Small-Outline Integrated Circuit. ... A datasheet is a document summarizing the performance and other characteristics of a component (e. ...

The standard 2-, 3-, 4- and 8-input NOR gates are available:

• CMOS
  • 4001: Quad 2-input NOR gate
  • 4025: Triple 3-input NOR gate
  • 4002: Dual 4-input NOR gate
  • 4078: Mono 8-input NOR gate
• TTL
  • 7402: Quad 2-input NOR gate
  • 7427: Triple 3-input NOR gate
  • 7425: Dual 4-input NOR gate
  • Mono 8-input NOR gate is not available in TTL

Static CMOS Inverter Complementary-symmetry/metal-oxide semiconductor (CMOS) (see-moss, IPA:), is a major class of integrated circuits. ... A Motorola 68000-based computer with various TTL chips. ...

Implementations

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Alternatives

NOR Gate Constructed Using Only NAND Gates

If no specific NOR gates are available, one can be made from NAND gates in the configuration shown below. Interestingly, any logic gate can be made either from a combination of NAND gates or from a combination of NOR gates. Image File history File links No higher resolution available. ... NAND gates have the property, along with NOR gates, to be able to be combined to form any other kind of logic gate. ... a simple NOR gate NOR gates have the property, along with NAND gates, to be able to be combined to form any other kind of logic gate. ...

See also

• AND gate
• OR gate
• NOT gate
• NAND gate
• Boolean algebra
• Logic gates