![]() The second comparator -ve input terminal is connected to the Trigger pin, while the +ve input terminal to the 1/3 reference voltage at the voltage divider. The first comparator -ve input terminal is connected to the 2/3 reference voltage at the voltage divider and the external control pin, while the +ve input terminal to the external Threshold pin. Similarly, if the voltage at the negative input terminal is higher than the voltage at the positive terminal, the comparator will output 0. If the input voltage at the positive terminal is higher than the input voltage at the negative terminal the comparator will output 1. Then, there are two comparators that compare two analog voltages. The reference voltages are 1/3 and 2/3 of the supplied voltage that ranges from 5 to 15V. The voltage divider consists of three 5k resistors which create two reference voltages. The main function of this IC is to generate an accurate timing pulse for operating various devices and electronic components. The functional parts of the 555 timer IC include a flip-flop, voltage divider & a comparator altogether. The 555 Timer is designed using 25 transistors, 2 diodes and 15 resistors. The IC 555 timer is a chip used in various areas and applications like pulse generation, an oscillator, and a timer. ![]() You can check the datasheet of NE555 IC if you want to learn more about it.ĭesign, Construction, Architecture & Working It has a wide range of usages in the electronic field as a timer, delay, pulse generation, oscillator, etc. ![]() The SE 555 Timer IC works between the temperature range of – 55☌ to 125☌ in SE and the IC NE 555 is used for where the temperature ranges from 0° to 70☌. ![]() These ICs are used as astable and mono-stable multi-vibrators in digital logic probes, DC-DC converters, tachometers, analog frequency meters, voltage regulators, temperature-controlled & measurement devices. These types of ICs are very cheap & reliable in cost & size, when compared to other IC example OP-Amp in the same areas. The IC 555 timer was invented in 1971 by “ Hans Camenzind” at Signetic Corporation and it was named SE or NE 555 timer.
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