I got the MAX3100 to operate properly in time but had a problem driving the
crystal input directly. It required a limiting resistor (220 to 330 ohm) to
prevent edges from exceeding VCC. When this occurred, the chip acted very
strangely. It was NOT noted anywhere in the documents.
Maxim has a problem of doing this sometimes.

Its actually a very nice part. I used two of them, as I needed 3 serial
ports (1 from PIC16F873 + these). The
IRQ went to the INT input, triggering low.

--Bob Axtell
EDTec LLC

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