The ADuM3221 defaults to output low when either the primary or the secondary is unpowered. This means that it is not required to have the external pull-down, but adding one should not interfere with normal operation.
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The ADuM3221 defaults to output low when either the primary or the secondary is unpowered. This means that it is not required to have the external pull-down, but adding one should not interfere with normal operation.