lm555h

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www.ti.com

LM555 Timer datasheet (Rev - Texas Instruments

For a stable operation as an oscillator, the free running frequency and duty cycle are accurately controlled with two external resistors and one capacitor. The circuit may be triggered and reset on falling waveforms, ...

www.princeton.edu

LM555/LM555C Timer - Princeton University

The LM555 is a highly stable device for generating accurate time delays or oscillation. Additional terminals are provided for triggering or resetting if desired. In the time delay mode of operation, the time is precis...