At 10:27 PM 2/3/02 -0600, you wrote: >As in a rapid transition from light emitting diodes to noise emitting >diodes... 8-) If they are run at 3mA average current and 1/8 duty cycle, if the CPU latches up they will see 24mA. Not fatal at normal Ta. Another reason not to push the duty cycle too low. Even 50mA won't likely be instantly fatal for most types. Best regards, Spehro Pefhany --"it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com 9/11 United we Stand -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.