555 (telephone number) - definição. O que é 555 (telephone number). Significado, conceito
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O que (quem) é 555 (telephone number) - definição

TELEPHONE NUMBER PREFIX
555 phone number; 5-5-5; KL5; Klondike 5; Klamath 5; 555-1234; 555 problem; 555 telephone numbers; 555 phone numbers; 555 telephone number; 555 (phone number); 555-2368; 555-0123; 555 area code; 555 (telephone number

555 (telephone number)         
The telephone number prefix 555 is a central office code in the North American Numbering Plan, used as the leading part of a group of 10,000 telephone numbers, 555-XXXX, in each numbering plan area (NPA) (area code). It has traditionally been used only for the provision of directory assistance, when dialing (area code)-555-1212.
Bundesautobahn 555         
FEDERAL MOTORWAY IN GERMANY
Autobahn 555; BAB 555
is an autobahn connecting the cities of Cologne and Bonn. It was constructed between 1929 and 1932, and opened to traffic on 6 August 1932.
555 timer IC         
  • Schematic of a 555 timer in astable mode
  • Schematic of a 555 in bistable Schmitt trigger mode. Example values C = 10 nF, R1 and R2 = 100 kΩ.
  • Schematic of a 555 in bistable flip-flop mode. High-value pull-up resistors should be added to the two inputs.
  • Schematic of a 555 timer in astable mode with a 1N4148 diode to create a duty cycles less than 50%
  • Schematic of a 555 in monostable mode. Example values C = 100 nF, R = 180 kΩ to 220 kΩ for debouncing a pulled-up pushbutton.
  • 250px
  • 555 timer circuit in a [[solderless breadboard]]
  • Silicon die of the first 555 chip (1971)
  • Inverted SR flip-flop symbol (without /Q) is similar to circuit on right
  • Waveform in astable mode
  • DIP]]-8 and SO-8 packages<ref name="TI_NE555_Datasheet"/>
  • Waveform in monostable mode
  • Pinout of 556 dual timer<ref name="TI_NE556_Datasheet"/><ref name="Signetics_1973_555-556_Databook"/>
  • 558 internal block diagram. It is different from 555 and 556 timers.<ref name="Signetics_1985_Linear_Databook"/>
  • Pinout of 558 quad timer<ref name="Signetics_1985_Linear_Databook"/>
  • Die of a CMOS NXP ICM7555 chip
  • Die]] of a NE556 dual timer manufactured by [[STMicroelectronics]]
  • Schmitt trigger inverter gate (lower symbol) is similar to circuit on right
  • Die of a NE558 quad timer manufactured by [[Signetics]]
INTEGRATED CIRCUIT CHIP FOR TIMING APPLICATIONS
NE555; 555 timer; 555 oscillator; 555 IC; LM555; 556 Timer; 555 timer chip; 555 (timer); Joystick interface; Quad timer; Joystick interface circuit; Joystick circuit; Signetics NE555 Timer; Timex 555; Timer 555; 555 chip; 555 timer ic; 555 Timer; 555 Timer IC; 558 timer
The 555 timer IC is an integrated circuit (chip) used in a variety of timer, delay, pulse generation, and oscillator applications. Derivatives provide two (556) or four (558) timing circuits in one package.

Wikipédia

555 (telephone number)

The telephone number prefix 555 is a central office code in the North American Numbering Plan, used as the leading part of a group of 10,000 telephone numbers, 555-XXXX, in each numbering plan area (NPA) (area code). It has traditionally been used only for the provision of directory assistance, when dialing (area code)-555-1212.

The central office code is also used for fictitious telephone numbers in North American television shows, films, video games, and other media in order to prevent practical jokers and curious callers from bothering telephone subscribers and organizations by calling telephone numbers they see in works of fiction.