The document discusses integrated circuits, specifically comparing IC 741 and IC 742, and explains the functionality of the pins in IC 741. It highlights that IC 741 has 8 pins, with 7 active and one inactive, and details the input pins. Additionally, it mentions the IC 555 timer, named for its three 5kohm resistors.

1. Integrated circuits

2. Eg.Why IC 741 and why not IC 742?
There are certain reasons.

4. PIN DIAGRAM
WHY IT IS NAMED AS IC
741
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There are 8 pins
7 pins are Active i.e Pin
1,2,3,4,5,6,7
1 Pin is inactive i.e Pin
4 Pins are for input i.e
Pin Nos. 2,3,4,7.

5. BLOCK DIAGRAM
WHY IC 555?
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Timer IC
The name of 555
came from the three
5kOhms resistors at
its input!