DATASHEET and Circuit Diagram

The following NE555 datasheet includes another 555 Precision Timers series which is produced by Texas Instruments such NA555, SA555, and SE555. In the datasheet you can find application information for designing monostable operation, astable operation, missing-pulse detector, frequency divider, pulse-width modulation, pulse position modulation and sequential timer using the NE555 series with circuit diagram for each application.

The figure above shows you the NE555 Missing-Pulse Detector Circuit Diagram. According to the datasheet, this circuitry design can be used to detect a missing pulse or abnormality long spacing between consecutive pulses in a train of pulses. When the pulse spacing is less than the timing interval, the timing interval is retriggered continuously by the input pulse train.

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There are many type of “The IC Time Machine” – 555 Timer IC, it depends on their manufacturers. For example Philips and Texas Instrument named this device as SE/NE555, National Semiconductor for LM555, Motorola/ON-Semi for MC1455. These devices provide relatively cheap and practical solutions for a variety of applications related to electronic timing (timing).

Even differ from their names but type of 555 Timer IC function and diagram mutually compatible with each other or so called functional and pin-to-pin compatible. Only a few specific characteristic that make them different such power consumption, maximum frequency and etc. They work in three operating modes: monostable, ashtable and bistable/scmitt trigger. Thus, these device can be applied in many purposes such as timers, touch switch, pulse detection, logic clock, security alarm, lamp flashers, bouncefree latched switches, etc.

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