TXB0108 bi-directional level converter.
This chip perform bidirectional level shifting from pretty much any voltage to any voltage and will auto-detect the direction.
Only thing that doesn't work well with this chip is i2c (because it uses strong pull-ups which confuse auto-direction sensor).
If you need to use pullups, you can but they should be at least 50K ohm - the ones internal to AVRs/Arduino are about 100K ohm so those are OK!
Its a little more luxurious than a 74LVX245 but if you just don't want to worry about directional pins this is a life saver!
Since this chip is a special bi-directional level shifter it does not have strong output pins that can drive LEDs or long cables,
it's meant to sit on a breadboard between two logic chips!
1.1.2V 1.8V 2.2V 2.5V 3.3V 5V Logic Level Bi-directional Converter Module