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The NE555 SMD is a Highly Stable Timer that can be used to generate precise time delays and oscillation. If desired, additional terminals are provided for triggering or resetting. One external resistor and capacitor accurately control the time in the time delay mode of operation. As an oscillator, it needs to be as stable as possible. Two external resistors and one capacitor are used to precisely control the free-running frequency and duty cycle. On falling waveforms, the circuit can be triggered and reset, and the output circuit can source or sink up to 200mA or drive TTL circuits.
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