OR gate

The OR gate is a digital logic gate that implements logical disjunction - it behaves according to the truth table to the right. A HIGH output (1) results if one or both the inputs to the gate are HIGH (1). If neither input is high, a LOW output (0) results. In another sense, the function of OR effectively finds the maximum between two binary digits, just as the complementary AND function finds the minimum.

Symbols

There are two symbols of OR gates: the American (ANSI or 'military') symbol and the IEC ('European' or 'rectangular') symbol, as well as the deprecated DIN symbol. For more information see Logic Gate Symbols.

Hardware description and pinout

OR Gates are basic logic gates, and as such they are available in TTL and CMOS ICs logic families. The standard 4000 series CMOS IC is the 4071, which includes four independent two-input OR gates. The traditional TTL version is the 7432. There are many offshoots of the original 7432 OR gate. All have the same pinout but different internal architecture, allowing them to operate in different voltage ranges and/or at higher speeds. In addition to the standard 2-Input OR Gate, 3- and 4-Input OR Gates are also available. In the CMOS series, these are:

Gate

A gate or gateway is a point of entry to a space enclosed by walls, or a moderately sized opening in some sort of fence. Gates may prevent or control the entry or exit of individuals, or they may be merely decorative. Other terms for gate include yett and port. The word derives from the old Norse "gata", meaning road or path, and originally referred to the gap in the wall or fence, rather than the barrier which closed it. The moving part or parts of a gateway may be called "doors", but used for the whole point of entry door usually refers to the entry to a building, or an internal opening between different rooms.

A gate may have a latch to keep it from swinging and a lock for security. Larger gates can be used for a whole building, such as a castle or fortified town, or the actual doors that block entry through the gatehouse. Today, many gate doors are opened by an automated gate operator.

Types

Types of gates include:

List of scandals with "-gate" suffix

This is a list of scandals or controversies whose names in scholarly sources include a "-gate" suffix, by analogy with the Watergate scandal. This list also includes controversies that are widely referred to with a "-gate" suffix, but may be referred to by another more common name in scholarly sources (such as New Orleans Saints bounty scandal).

Etymology, usage, and history of -gate

The suffix -gate derives from the Watergate scandal of the United States in the early 1970s, which resulted in the resignation of U.S. President Richard Nixon. The scandal was named after the Watergate complex in Washington, D.C.; the complex itself was named after the "Water Gate" area where symphony orchestra concerts were staged on the Potomac River between 1935 and 1965.

The suffix is used to embellish a noun or name to suggest the existence of a far-reaching scandal, particularly in politics and government. As a CBC News column noted in 2001, the term may "suggest unethical behaviour and a cover-up". The same usage has spread into languages other than English; examples of -gate being used to refer to local political scandals have been reported from Argentina, Germany, Korea, Hungary, Greece and the former Yugoslavia.

Gate (disambiguation)

A gate is an opening in a wall or fence fitted with a moveable barrier allowing it to be closed.

Gate or GATE may also refer to:

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