If don't follow these, IC would be burnt and damaged. Second, we cannot draw more than 100mA from the chip. The important electrical characteristics of timer are that it should not be operated above 15V, it means the source voltage cannot be higher than 15v. For instance the output is considered high now with interruption it goes low and it stays low. With each interruption the output changes and stays there. This means both the output states are stable. If the stable state is chosen low, with interrupt the output goes high for a short time before coming to low. So when a interrupt is given, the timer goes low for a short time and since the low state is unstable it goes to high after that time. If the stable output is selected high, then the timer always tries to put high at output. The stable state can be chosen either high or low by the user. This means there will be one stable state and one unstable state. This character of unstable output is used as clock or square wave output for many applications. So the output will be swinging between high and low. This means there will be no stable level at the output.
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