>> I'm looking for recommendations for a single-package 
>> solution to
>> interface a PIC to an outside-world serial port.  I have 
>> +/-18V
>> supplies available, so I don't need a charge pump device 
>> like the
>> MAX232 (and it's extra caps).  The TI SN75155 would do 
>> the job,
>> but it costs more than the MAX232 does, and this is a
>> cost-sensitive project.  Any ideas?

You can use a single transistor in each direction with good 
results in many applications. Purists may (will) shudder but 
you can get results which will work about as well as many 
"proper" solutions in the vast range of applications. At the 
very extreme of interfaces you may have problems but for 
short distance connections you should be fine.


        Russell


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