Understanding Motor Controls
Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Chapter 53, Problem 1RQ
To determine

The identification of the pin 1 of an in line integrated circuit.

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Explanation of Solution

Identifying the left hand side of the IC is done by looking for a notch on the top of the package. The top left pin is pin1 which is sometimes identified with a small dot next to it. 555 timer is an integrated circuit with eight pins which is widely used in industrial electronics.

The presence of a notch at an end or dot on one pin gives the identification of the pin 1. Thus, a notch or a dot is used to identify the pin 1 in 555 timer.

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