DATASHEET and Circuit Diagram

The 555 Timer IC worked in three operating modes: monostable, astable and bistable/scmitt trigger. Here we will provide you with article of its astable mode which also called as free running oscillator mode. As mentioned in the previously article of this device, that it is designed that only require a few external components to work, mainly are external resistors and capasitors.

The article below describe us about understanding of all parts of this circuit, and simulating the 555 Timer IC as a free running oscillator (astable mode). Accordingly, it does the capacitor which has been the key component of the astable timer. It can be distilled into just this: charge and discharge a capacitor then repeat it indefinitely. Through resistors connected either to VCC or GND, is how this can be done.

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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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