> PIC24's are all 3.3V though, aren't they? >=20 >=20 > Quoting Mark Hanchey : >=20 > > I just got some of the 24F16KA102 samples and am liking them a lot. Cos= t > > is about the same as the 18 series and it is 20 pin dip so easy to > > prototype with. Features are good too like an internal RTC. > > No there are some that are 5V on the pins. Look at the PIC24FV series if I = remember the part numbers correctly. They only come in smaller pin packages= (up to 24/28?). They have 3.3V siblings (loose the V from the chip number)= .. But otherwise all of the big pinout ones are 3V, but also note that the cor= e voltage is lower and they have internal regulators. The regulator can be = disabled and run the whole chip at the core voltage, 2V -2.5V for a lot of = them, but the new PIC24E/PIC33E series run at 1.8V core, with 3V I/O. Vario= us members of the families have 5V compatible I/O pins which use 3.3V level= s as inputs, but will withstand 5V levels. When run as outputs they are ope= n drain, which is a pain, pity they don't have an I/O power pin like FPGAs = have. If you wish to run USB you have to use a 3.3V chip and the I/O has to run a= t 3.3V. But again some of these chips have the 5V compatible pins. --=20 Scanned by iCritical. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .