Playing with my Microstick II, which uses 3.3 volt PICs. I need to
interface to the 5 volt world at times. The 24F parts, for example, will
allow 5 volts on most digital inputs, and provide an open-drain for
outputs which will handle 5 volts. I expect this is OK for most things
(such as connecting a MAX232 for serial I/O). But if I need higher
speeds for output, the open drain with a resistor may be too slow (I've
not yet done any calculations).

What is the normal way of handling this sort of thing? Are there 3.3
volt to 5 volt buffer chips,etc?
--=20
Larry Bradley =20
Orleans (Ottawa) Canada=20

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