Hi,
What is the voltage level of PMBUS signals in TPS546D24 (5V or 3.3V)?
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The PMBus pins on the TPS546D24 are identical to those found on the TPS546D24A (http://www.ti.com/product/tps546d24a )
They are compliant with SMBus 3.1.1 1MHz bus speed.
Pin voltages greater than or equal to 1.35V are guaranteed to be read as a "High"
Pin voltages less than or equal to 0.8V are guaranteed to be read as a "Low"
Pin voltages between 0.8V and 1.35V are not guaranteed.
The internal open-drain pull-down drivers are guaranteed to provide a pin voltage of 0.4V or less when sinking a pull-up current of 20mA or less.
This is compatible with bus termination voltages of 1.8V, 3.3V or 5V.