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UCC27614: Supply voltage vs signal input voltage

Part Number: UCC27614

Hi

I am using about 0-25V signal at the input.
Supply voltage to the IC is 15V.   

I need this because I want to limit the output voltage to 0-15V. 
Will this create a problem?

I saw in the description that it uses TTL logic so power supply is independent of the input. 

But some ICs contains reverse biased protection diodes connected between signal and power rails. If this same method used in this IC as well, then it will be a problem .

Regards

Damith