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TMP75B: Clarification of Power Supply Recommendations

Part Number: TMP75B

Hi

While reading the datasheet I came across chapter 9 "Power Supply Recommendations". There you can find following sentence. 
"The TMP75B operates with power supply in the range of 1.4 V to 3.6 V. It is optimized for operation at 1.8-V supply but can measure temperature accurately in the full supply range."

I would like to ask what "optimized for 1.8-V supply" means? Do I have any drawbacks (except of a higher current draw) when I use it with 3.3V?  

Thank you for your anwer.

Best Regards
Marcel Kaltschmied