> Please report to the piclist if you ever get a device that fails at > one Vdd and passes at the other. I would be interested in such a > result. Microchip says it won't happen. It was myself who sent in the reference to AN910 a few days ago, which is unclear at best when describing the need for multiple voltage verification. I am not as well educated as many of you here, and would certainly not challenge anyones assertions, but I do think it wise to consider: An Application Note from Microchip may not be a solid basis for making sound technical decisions. There was another App Note in the past that advocated connecting live AC voltage to an input, with only a high R resistor and an assumption that the built-in protection diodes would make it "OK". I guess what I'm saying is that I'd trust the opinions of many people on this list over the assertions of any single Microchip AN. Just my opinion, of course. :-) Lyle -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist