ridgid.com> writes: > If you use e.g. the external diode you mentioned, or even a resistive divider, > then the pin would not have > seen a voltage outside specified range, the protection diodes would not have > conducted, and life is good. Yes, it seems that one HAS GOT to use clamps external to the chip all the time. But I had not expected the clamps to need to be Schottky. As I said before, previous drop-in compatible chips were happy with silicon clamps, or none at all. thanks all, Peter P. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist