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TCA9406: TCA9406 - 1V8 to 1V8 translation

Petr Zkrat
Intellectual 410 points
Part Number: TCA9406

Hi,

I am using TCA9406 for level translation in multiple places in design. Unfortunately due to copy-paste error one of the them is also between two independent 1V8 domains, meaning that VCCB violates 2V3 requirement. The bus seems to be working fine (it is very slow  @ 100kHz and both sides have external 1V8 pull-ups). Master is conencted to the A side while B side is slave only.

What are the possible consequences of running VCCB @ 1V8? Plan is of course to fix this in the next PCB spin, however, would be good to know what are the risks for this round of prototypes. Is there any part in DSBGA that would allow this "translation"?

Thanks

Petr

  • 0
    TI__Mastermind 49110 points

    Hey Petr,

    "What are the possible consequences of running VCCB @ 1V8?"

    The electrical characteristics will likely no longer match with the datasheet as the datasheet was characterized with VccB at larger voltages (likely timing parameters). I believe Ron between side 1 and side 2 when passing a LOW will be larger resulting in a higher VoL on the non-driving side since there is a weaker bias on the gate. 

    "Is there any part in DSBGA that would allow this "translation"?"

    Unfortunately this device has a unique pin out so we don't have a pin to pin replacement.

    -Bobby