The most popular IC used in timing circuit is

This question was previously asked in
IPRC (ISRO) Technician B (Electronic Mechanic): Previous Year Paper (Held on 10 Dec 2016)
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  1. 555
  2. 741
  3. LM317
  4. 7400

Answer (Detailed Solution Below)

Option 1 : 555
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555 timer:

The 555 timer IC is an integrated circuit used in a variety of timer, pulse generation, and oscillator applications.

It has three operating modes

Astable mode – In this mode, the 555 IC can be used as an oscillator, pulse generator, logic clocks, etc.

Monostable mode – In this mode, the 555 functions as a ‘one-shot’ pulse generator and finds uses in frequency divider, timers, pulse detection, touch switches.

Bistable mode – In this mode, the 555 IC can be operated as a flip-flop, latches.

555 timer IC with the description of pins is shown below:

D197

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