Maxim has such a beast, the MAX3110 and 3111:
http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2052

SPI UART with RS-232 transceiver, and built in charge pump that uses
no external caps.

Of course, they are expensive ($4.75 @1k) and don't seem to be
available as RoHS compliant.

-Adam


On 4/26/06, William Chops Westfield <westfw@mac.com> wrote:
> Remember a while ago when we were talking about whether there
> was likely to be a uart (or microcontroller) with built-in
> rs232 drivers?  Well, guess what Exar just announced:
>
> http://www.exar.com/new.php?newsID=272
>
> BillW
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