Digital signal translation

I am wondering about signal levels and translation of voltage levels. I am having an Atmel mega16 that has to interface with an device at 3V3 level logic (even if it is running at VccUART interface (in total 6 lines)

But when i look at datasheets of translators, there is always some note on threestate..

What does that mean? For instance, MAX3000E/MAX3001E/MAX3002 have an EN pin that if pulled low, there is a threestate output mode on 8 I/O:s and the 8 other I/O:s have internal pull down resistors.

Would be very happy if someone could enlighten me!! Kind regards peter

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Beagles
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