The AM26LV32E (we're using AM26LV32EIPWR) is intended for use in applications when its inputs are connected to an active (driven) line even though it - and the electronics connected to its outputs (a microcontroller) - are not powered. Thus it is specified to tolerate +/-14v on those inputs even with no power, and the outputs are still guaranteed to output no more than +/-100µA. Correct me if I'm wrong in my interpretation of the data sheet.
However this raises a few questions:
- Is Ioff the total output current for all four outputs or is it per output?
- What is the leakage path from the inputs to the supply rail, ie what current should we expect to see driven onto the (unpowered) Vcc from a powered line. (I am aware of the figure in section 8.2).
In short, I want to avoid the differential lines back-powering the rest of our system when it remains connected but powered-off. What amount of current to I need to expect back-powering from the AM26LV32E?
If this question looks a bit familiar it's because I asked it earlier, but named the wrong (but closely-related) part, here. Hao L kindly responded to that. But I meant to ask about this. And in this case there is some DC path (see section 8.2) - but is that all?
Thanks (Again!)
Andrew