On 1/19/07, Rich wrote: > Hi guys: > I stupidly put 5 volts to a 3.3 volt part. I missed it in the checking and the PCB is fabbed. I thought of lifting the pin (can't cut the trace because it is an internal layer) and knocking down the voltage with a zener glue-on. I hope the zener impedance will be low enough. The part is an EEPROM. Has anyone had any experience with this type of fix? I will get new boards for production but I don't want to spring for another 300 bucks for a test board. I confess to stupid things from time to time. It will probably work, but you'll need to add a 50K resistor to ground to make a bit of current go through the zener. Does the EEPROM have chip enable inputs that are fixed at 3.3V? You could leave Vcc disconnected and power through the protection diodes on those inputs. Not a long term solution, but it might get you by until your next board rev. Regards, Mark markrages@gmail -- You think that it is a secret, but it never has been one. - fortune cookie -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist