> Hey... the PIC16F87x doesn't have an internal oscillator, and I > don't hear people saying that it's going obsolete... No, but it has slightly more going for it than the once-darling F84. My suppliers do not now stock the F84 and never will again Sivaram, if you did mean the RC option, this graph should be of some help choosing components http://home.clear.net.nz/pages/joecolquitt/0f84rc.html -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.