This part is a kind of semiconductor called A2S56D40CTP.

Function of this product has (A2S56D20CTP - A2S56D40CTP) 256Mb DDR SDRAM.

Manufacturers : Powerchip Semiconductor

Image and pinout :

Some of the text within the PDF file :

256Mb DDR SDRAM Specification A2S56D20CTP A2S56D30CTP A2S56D40CTP Powerchip Semiconductor Corp. No.12, Li-Hsin Rd.1, Science-based Industrial Park, Hsin-Chu Taiwan, R.O.C. TEL: 886-3-5795000 FAX: 886-3-5792168 256Mb DDR Synchronous DRAM Powerchip Semiconductor Corp. A2S56D20CTP (4-bank x 16,777,216 - word x 4-bit) A2S56D30CTP (4-bank x 8,388,608 - word x 8-bit) A2S56D40CTP (4-bank x 4,194,304 - word x 16-bit) ORDERING INFORMATION Order Part Number Frequency Speed(ns) Type Standard Low Power Pb-Free Low Power Package and Pb-Free -G5L 400mil TSOP-2 200MHz 5 A2S56D20/30/40 CTP -5 -5L -G5 166MHz 6 A2S56D20/30/40 CTP -6 -6L -G6 -G6L 400mil TSOP-2 400mil TSOP-2 133MHz 7.5 A2S56D20/30/40 CTP -75 -75L -G75 -G75L Type Designation [ ... ]

A2S56D40CTP PDF Datasheet Download