The datasheet for the KV30 implies that inputs are protected from a positive overvoltage if a current limiting resistor is used:
"All analog and I/O pins are internally clamped to VSS through ESD protection diodes. If VIN is less than VIO_MIN or
greater than VIO_MAX, a current limiting resistor is required. The negative DC injection current limiting resistor is
calculated as R=(VIO_MIN-VIN)/|IICIO|."
However testing this with a 100k input resistor, the device does not seem to clamp the input voltage (tested up to 6.5 V which is well in excess of the 'VIO_MAX'). This makes sense since the datasheet also says that pins are only clamped to VSS, so I am wondering if the inputs are actually protected from overvoltage events like implied.