555: Difference between revisions
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a stable example e16ed2c24e88fa6738359867b4402716 |
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</pre> | </pre> | ||
Datasheet: http://www2.st.com/resource/en/datasheet/ne555.pdf | Datasheet: | ||
* http://www.ti.com/lit/ds/symlink/ne555.pdf | |||
* http://www2.st.com/resource/en/datasheet/ne555.pdf | |||
More: https://en.wikipedia.org/wiki/555_timer_IC | More: https://en.wikipedia.org/wiki/555_timer_IC | ||
[[File:555astable.png]] | |||
''Note A: Connect pin 5 to ground via capacitor for better performance.'' | |||
'''Frequency = 1.44 / ((Ra+Rb)C)''' | |||
'''Duty Cycle = Rb / (Ra + 2Rb)''' | |||
Latest revision as of 16:41, 14 March 2017
Teh world famous'ist/old'ish/ubiquitous IC
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- Operating Voltage 3-15v (typical)
- Operating frequency >500Khz
- Astable and monostable modes
- Adjustable duty cycle
- Output source or sink up to 200mA
---U---
GND (1)-| |-(8) Vcc
TRIG (2)-| 555 |-(7) DIS
OUT (3)-| |-(6) THR
RESET (4)-| |-(5) CTRL
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Datasheet:
More: https://en.wikipedia.org/wiki/555_timer_IC
Note A: Connect pin 5 to ground via capacitor for better performance.
Frequency = 1.44 / ((Ra+Rb)C)
Duty Cycle = Rb / (Ra + 2Rb)