Dallas DS275, see the application schematics on
my pc:

http://pcden.unile.it/robotica/RoboFAQ/rs232.gif

No idea if it is smaller and/or cheaper, though.

Ciao
Giorgio

----------------------------------------------
     Dr. Giorgio De Nunzio

     Dipartimento di Scienza dei Materiali
     Universita' di Lecce

     via Arnesano
     73100 Lecce (Italy)

     e-mail   giorgio.denunzio@unile.it

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