The two descriptions do not contradict each other. MAX1481 has a failsafe feature where there is a weak pullup to VCC at input A and a weak pulldown at input B. When input is open, input A is pulled up and input B is pulled down, pulling differential voltage across A and B to be above 200mV, and ensures that RO outputs a logic-high. However, since the internal pullup and pulldown are both very weak, any external connection will override the internal pullup and pulldown. It only maintains a logic-high under open circuit condition, and does not conflict with the input threshold.
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KCC's Quizzes AQQ305 about a mutual exponentiation equation
1. Quote of the month: "A train station is where a train stops. A bus station is where a bus stops. I have a work station on my desk, so..." - unknown
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Quiz: How Well Do You Know Adaptive Power Switching?
Is your I/O module overheating? The AD74416H's Adaptive Power Switching (APS) can cut heat dissipation by up to 40% — but how well do you really understand how it works?
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