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  • TI Thinks Resolved

TCA9406: TCA9406

Part Number: TCA9406

Hi Team,

For a new design I using TI TCA9406 I2C Level Shifter – to translate from 1.8V to 3.3V voltage levels.

Up to now I have used TI PCA9306, but since the new design needs to support 800KHz mode, I changed to TCA9406

 

However I facing difficulties with the new part, mainly signal integrity issues.

For the same PCB and same I2C master and slave the ne part does not work – and the old one does (at 100KHz/400KHz).

 

I ask for your advice on how to remedy this issue.

 

Thanks,

Shlomi

 

  • In reply to Shlomi Yehezkia:

    Hey Shlomi,

    Yes 100nF should be fine, it's a rather common value used in the industry. Once everything is populated, you can put an oscope to the power supply rails (attach at the decoupling cap near the Vcc pins) just to check if you see any noticeably bad ripple there.

    Thanks,
    -Bobby
  • In reply to TRX Bobby:

    Hello Shlomi,

    Did you consider using the TCA9617B, this is a buffered translator but is designed for Fast Mode Plus (1MHz)?  This gives you the ability to not have a Rise Time Accelerator and yet still have the strength need to work at faster speeds using stronger pull up resistors.  

    -Francis Houde

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