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NE555 Datasheet(PDF) 8 Page - ARTSCHIP ELECTRONICS CO.,LMITED.

Part No. NE555
Description  PRECISION TIMERS
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Manufacturer  ARTSCHIP [ARTSCHIP ELECTRONICS CO.,LMITED.]
Direct Link  http://www.artschip.com/
Logo ARTSCHIP - ARTSCHIP ELECTRONICS CO.,LMITED.

NE555 Datasheet(HTML) 8 Page - ARTSCHIP ELECTRONICS CO.,LMITED.

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NE555,SA555,SE555
PRECISION TIMERS
www.artschip.com
8
APPLICATION INFORMATION
Missing-pulse detector
The circuit shown in Figure 15 can be used to detect a missing pulse or abnormally long spacing between consecutive pulses in a
train of pulses. The timing interval of the monostable circuit is retriggered continuously by the input pulse train as long as the pulse
spacing is less than the timing interval. A longer pulse spacing, missing pulse, or terminated pulse train permits the timing interval
to be completed, thereby generating an output pulse as shown in Figure 16.
Pin numbers shown are shown for the D, JG, P, PS, and PW package.
Figure 15. Circuit for Missing-Pulse Detector
Time – 0.1ms/div
Figure 16. Completed-Timing Waveforms
For Missing-Pulse Detector
Frequency divider
By adjusting the length of the timing cycle, the basic circuit of Figure 9 can be made to operate as a frequency divider. Figure 17
shows a divide-by-three circuit that makes use of the fact that retriggering cannot occur during the timing cycle.
Time – 0.1 ms/div
Figure 17. Divide-by-Three Circuit Waveforms
Pulse-width modulation
The operation of the timer can be modified by modulating the internal threshold and trigger voltages, which is accomplished by
applying and external voltage (or current) to CONT. Figure 18 shows a circuit for pulse-width modulation. A continuous input pulse
train triggers the monostable circuit, and a control signal modulates the threshold voltage. Figure 19 shows the resulting output
pulse-width modulation. While a sine-wave modulation signal is shown, any wave shape could be used.


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