I like the lvc family of logic for level conversion. The inputs will operate at up to 5.5V. The 74lvc1g07 is a single gate buffer with an open collector output. Alternatively you can get them in packages with more gates. In both cases, stepping up or stepping down, set the supply voltage of the logic to the lower voltage.
On 19/12/2012, at 4:20 AM, Curtis Olson <curtolson@flightgear.org> wrote:

On Tue, Dec 18, 2012 at 10:40 AM, Caleb Phillips <cphillips@areai.aero> wrote:
We built a board that has a MAX3013 chip for level converting. Also a MAX3387E for RS232 comms.

I think even a level converter like this one should work:
https://www.adafruit.com/products/395

For what it's worth, I've used the 8 channel adafruit level translator (linked above) and have had success with serial communication, spi communication, and pwm signals for servos.

Regards,

Curt. 
--
Curtis Olson:
http://www.atiak.com - http://aem.umn.edu/~uav/
http://www.flightgear.org - http://gallinazo.flightgear.org

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