This part is a kind of semiconductor called AD402M322VCB-5.

Function of this product has Low voltage operation is more suitable to be used on battery backup/ portable electronic.

Manufacturers : ETC

Image and pinout :

Some of the text within the PDF file :

ASCEND Semiconductor 4Mx4 EDO Data sheet Rev.1 Page 1 AD 40 4M 4 2 V S A – 5 Ascend Semiconductor EDO/FPM D-RAMBUS DDRSDRAM DDRSGRAM SGRAM SDRAM : : : : : : 40 41 42 43 46 48 Density 16M : 16 Mega Bits 8M : 8 Mega Bits 4M : 4 Mega Bits 2M : 2 Mega Bits 1M : 1 Mega Bit Organization 4: x4 8 : x8 9 : x9 16 : x16 18 : x18 32 : x32 Refresh 1 : 1K 8 : 8K 2 : 2K 6 :16K 4 : 4K Min Cycle Time ( Max Freq.) -5 : 5ns ( 200MHz ) -6 : 6ns ( 167MHz ) -7 : 7ns ( 143MHz ) -75 : 7.5ns ( 133MHz ) -8 : 8ns ( 125MHz ) -10 : 10ns ( 100MHz ) EDO : -5 (50 ns) -6 (60 ns) Revision A : 1st B : 2nd C : 3rd D :4th Interface V: 3.3V R: 2.5V Package C: CSP B: uBGA T: TSOP Q: TQFP P: PQFP ( QFP ) L: LQFP S: SOJ Rev.1 Page 2 Description The device CMOS Dynamic RAM organized as 4,194,304 words x 4 bits wit [ ... ]

AD402M322VCB-5 PDF Datasheet Download