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What is the operating voltage of Atmega168?

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What is the operating voltage of Atmega168?

(a) 12V to 9V

(b) 1.9V to 5V

(c) 1.8V to 5.5V

(d) 1.1V to 5V

This question was addressed to me in an online interview.

Origin of the question is Microcontroller Specifications in portion AtMega Microcontroller Specifications of Arduino

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Correct answer is (c) 1.8V to 5.5V

For explanation I would say: The operating voltage of the Atmega168 is 1.8V to 5.5V. Provide any voltage lower than that and the chip will not function. But however, if any voltage higher than the rated voltage is provided there is a chance of damaging the IC physically. So, under no circumstance should this chip be provided a voltage more than the rated voltage.

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