The Apple A5, a 32-bit system on a chip (SoC) designed by Apple Inc. and manufactured by Samsung, was used in the iPad 2 and the iPhone 4S, and uses the PoP method of installation to support RAM.
The S5L8947 version of the A5 was used only in the third-generation Rev A Apple TV. Also unlike the previous two A5 versions, this version does not use the PoP method of installation to support RAMRAM is found externally from the A5 chip. 
