It must be. The supply voltage for the 0.25um J parts is only up to 3V6. >From 18F87J10 Datasheet: Special Microcontroller Features: * Operating voltage range: 2.0V to 3.6V * 5.5V tolerant input (digital pins only) * On-chip 2.5V regulator * Low-power, high-speed CMOS Flash technology -----Original Message----- From: WH Tan [mailto:whsiung@tm.net.my] Sent: Thursday, July 14, 2005 8:26 PM Probably for the new J part? ----- Original Message ----- From: "Wouter van Ooijen" To: "'Microcontroller discussion list - Public.'" >> The target Vdd seems to be able to be adjusted from 5V downwards. > > That seems a bit silly to me, the lowest guaranteed vltage from USB > is iirc some 4.5V, who would want to adjust down from that? > > Wouter van Ooijen -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist