I found this datasheet site the other day; well worth bookmarking.
That site only found one of the three...
I find what works well, when the manufacturer is not known, is to search for the part at digikey, mouser, newark, avnet. They always have current links to datasheets.
Their site is arrange to be intentionally confusing so some users will accidentally click on the Ads embedded all around their website (ad clicks = money ... one can make an easy $50-$100 a day doing this. )
Well pardon me for trying to bloody help
Why? Google "<device> datasheet pdf" to find datasheets.
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via Egeo 16