mgth:
In table 1 of the datasheet it is clearly stated VDD Power +1.9V - +3.6
Only input voltage is 5V tolerance, and in this case you're even limited to 3.3V max for VDD.
It might work with 5v VDD, but the device could fry early.Some devices implementation include a 3.3v regulator, if you really need to plug it on 5v
Some of the devices on ebay (like this one http://www.ebay.com/itm/170819066537?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT) claim they have a 'Built-in voltage regulator', so they should require 5V or more (and because of the imminent regulator's voltage dropout 3.3V may or may not be enough).
Is this possible? I mean, has anybody seen those 'new' NRF24L01+ from ebay? Do they really eat 5V? I can not identify the regulator on the picture though.