The ones I've used either in DIL or SMT footprints have made the fourth pin usage "optional", i.e. you can tie it or leave it floating, or use it as an enable, but you still have to know what it requires ... so you have to read the data sheet. The "usual" power pins do apply, though, and output is typically on the corner diagonally opposite pin 1, which is the one you can "generally" (note the quotation marks) leave floating. I've run into one example in which the enable pin has to be tied to its active level, so that's not universal, though I don't recall whether that's always high. The makers prefer that their device fits into "any" application.

RE