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555 Timer

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Signetics NE555N.JPG


Description

The 555 Timer chip is designed to function as a monostable (one stable state) multivibrator or as an Astable (free running) multivibrator.


Features and Applications

It contains the equivalent of approximately 20 transistors, resistors, diodes etc. It is used for timing or switching circuits which give pulsed or digital outputs.

555Timer.jpg

Data: Pin

  1. connected to the negative (-ve) supply
  2. TRIGGER a voltage greater than 1/3 supply volts enables the chip.
  3. OUTPUT is equal to the supply volts when the output is on (600mW max).
  4. RESET when connected to positive supply volts.
  5. CONTROL OUTPUT applying a variable voltage to this pin varies the frequency of the output.
  6. THRESHOLD a voltage higher than the threshold voltage (2/3 supply volts) turns on the output.
  7. DISCHARGE when the output is turned on the pin goes to 0v allowing discharge of any connected capacitor.
  8. positive supply voltage (+ve) (4.5v - 16v)

Uses: Oscillators, triggers, inverters, timers.


DT Online Buyers' Guide
Transistor Selection NPN and PNP - Pack 40 - BC327 and BC547 TO-92 Package Transistor, NPN, TO-18 BC108 Pack of 5 Fairchild Semiconductor Bc547b Transistor, Npn, To-92 (pack Of 5) Bi-Polar NW 2N3053 By SPC Technology
 (BFY51 equivalent) 10 Pcs TIP120 60V 5A TO-220 Darlington Transistors NPN Linear Amplifier And Switching Application Toshiba Td62083F Sop-18 IC NE555P IC Timer DIL DIP 555 timer x 10 Texas Instruments UA741CP IC, OP-Amp 1MHZ, 0.5V/ us, DIP-8 (10 pieces) (20PCS) TC4001BP(N) IC Gate NOR Quad 2input 14-DIP TC4001BP 4001 TC4001 Spiratronics 4011B Quad 2 I/P NAND gate Logic IC
Transistor selection NPN and PNP - Pack 40 - BC327 and BC547 TO-92 Package Transistor, NPN, TO-18 BC108 Pack of 5 BC547B Transistor, Npn, To-92 (pack of 5) Bi-Polar NW 2N3053 (BFY51 equivalent) 10 pcs TIP120 60V 5A TO-220 Darlington Transistors NPN Linear Amp & Switching App. Toshiba TD62083F Sop-18 IC (8 channel Darlington) NE555P IC Timer DIL DIP 555 timer x 10 UA741CP IC, Op-Amp 1MHZ, 0.5V/ us, DIP-8 (10 pieces) (20PCS) TC4001BP(N) IC Gate NOR Quad 2input 14-DIP TC4001BP 4001 TC4001 4011B Quad 2 I/P NAND gate Logic IC