level shifter with txb0104

Hello,

do you guys think TXB0104 is a good choice to connect external UART to
UART2 on BBxM ?
would it be OK to power 1.8 ports from 1.8 rail on expansion header
(big one) ?
whether direct connect TXB0104 <-> BBxM be OK or it's better to set
current limiting resistors?

thanks, Alex