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Unused channels on a ADUM Digital Isolator

Question asked by dmeyers on Sep 15, 2017
Latest reply on Sep 19, 2017 by dmeyers

We are only using 2 of the 3 input channels on a ADUM1301ARWZ. I realize that a 2 channel option would be a better choice for our circuit but the board has already been designed and is in production. We are having some intermittent latch ups and failures with this part in our circuit and I suspect it has to do with the unused channel. How should we deal with the unused channels? See attached document for a schematic

 

  1. Leave input and output open
  2. Tie them to ground
  3. Tie them to ground through a resistor

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