Pullups for SPI voltage level translator

hi all,

i using 8-bit bidirectional voltage translator (txb0108; http://www.ti.com/lit/ds/symlink/txb0108.pdf) step down spi signals arduino display 3.3v 2.5v. question whether or not pullups needed between arduino , voltage translator.

here schematic of translator:


i have pull-down on output enable pin suggested in datasheet. understanding when outputs disabled, pins in high impedance state, prevent excessive current drain/sourcing while mcu initializes outputs. once output enabled, i'm little less sure. reasoning , because there inputs on "low voltage" side (nets marked _l) - i.e. on display - pullups needed keep pins in definite state when aren't actively being driven low. i'm not sure mcu -> voltage translator. should there pullups on line also?

the device cannot tolerate pullups or pulldowns unless very weak (greater 50k).  drives weakly in steady state, strong drive on transitions.  smart device.

so if worried initialization time use 100k pull-ups / downs , enable outputs once set up.  otherwise hard-wire enable on , should "just work".

Arduino Forum > Using Arduino > Networking, Protocols, and Devices (Moderator: fabioc84) > Pullups for SPI voltage level translator

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