I type the part number into Google. My first choice is the manufacturer's official website (Maxim, TI, Microchip...) but if that doesn't show up in the first page of results I will often see one of the major online vendors: DigiKey.com, Mouser.com, adafruit, sparkfun... They usually have datasheets for chips they sell.
This time it was Mouser that came up first.
I HATE the big datasheet aggregators. They often make you click through several pages and often don't have good search results. I almost never add the word 'datasheet' to my search because all the aggregators try to be high in the search results for that keyword.