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TUSB8042A: What is the maximum clock speed on the SMBus interface?

Part Number: TUSB8042A

Tool/software:

What is the maximum clock speed on the SMBus interface?  The datasheet says the maximum I2C master speed is 400KHz.  Most SMBus interfaces are limited to 100KHz.  We have tested the SMBus up to 1MHz and it still works, but what is the guaranteed maximum clock rate for this part as an SMBus slave?