This part is a kind of semiconductor called IS61NLP51236.

Function of this product has (IS61NVPxxxxx) STATE BUS SRAM.

Manufacturers : ISSI

Image and pinout :

Some of the text within the PDF file :

IS61NLP25672/IS61NVP25672 IS61NLP51236/IS61NVP51236 IS61NLP102418/IS61NVP102418 256K x 72, 512K x 36 and 1M x 18 18Mb, PIPELINE 'NO WAIT' STATE BUS SRAM FEATURES ISSI JULY 2006 ® DESCRIPTION The 18 Meg 'NLP/NVP' product family feature high-speed, low-power synchronous static RAMs designed to provide a burstable, high-performance, 'no wait' state, device for networking and communications applications. They are organized as 256K words by 72 bits, 512K words by 36 bits and 1M words by 18 bits, fabricated with ISSI's advanced CMOS technology. Incorporating a 'no wait' state feature, wait cycles are eliminated when the bus switches from read to write, or write to read. This device integrates a 2-bit burst counter, high-speed SRAM core, and high-drive capability outputs i [ ... ]

IS61NLP51236 PDF Datasheet Download