TSV911: parasitic body diode

Body diodes exist only on outputs; CMOS inputs are MOSFET gates, which are isolated.

But there are explicitly added ESD protection diodes; see footnote (2) in section 7.1.

Hi Mingkang,

Clemens is correct. 

You can also usually tell if there's diodes going to the positive rail by looking at the absolute max rating in the datasheet and seeing the input common mode voltage range. If the range allows around 0.5V beyond the rails then it likely has ESD protection diodes to both supplies. 

We have a document that goes into much greater detail called Op Amp ESD Protection Structures that goes into more detail! 

Let me know if that helps!

Best Regards,

Robert Clifton 

Yes; a resistor can limit the current to a safe value. Please note that the current flowing into the supply should not be larger than the supply current used by all the devices connected to it, or the supply voltage might rise.