[ts-7000] TS7400 serial ports - 5V or 3.3V?

[Doug Chapman <>]

I just got my TS7400 today, (it was rush ordered because I just fried my 7250, 
very sad).  I am rushing to get a robot ready for the Trinity College 
competition in a few weeks.

I was just about to pull out my MAX233 chip out of the drawer to hook up a TTL 
- RS232 converter.  Before I do are these pins 5V tolerant or are they limited 
to 3.3V.  I searched for posts and found some discussions but nothing 
authoritative.  From the MAX233 spec sheet it appears this chip is 5V only.

I also plan on having the second serial port communicate with an other 5V 
serial device.  If the 7400 is limited to 3.3v does anybody have a suggestion 
for a 3.3V - 5V serial translator?


thanks,

- Doug




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