ZHCSMS9J September 1973 – February 2025 NA555 , NE555 , SA555 , SE555
PRODUCTION DATA
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The circuit shown in Figure 7-1 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 re-triggered 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 7-2.
Figure 7-1 Circuit for Missing-Pulse Detector