This part is a kind of semiconductor called DS1225Y.

Function of this product has 64k Nonvolatile SRAM.

Manufacturers : Dallas

Image and pinout :

Some of the text within the PDF file :

DS1225Y DS1225Y 64K Nonvolatile SRAM FEATURES PIN ASSIGNMENT NC A12 A7 A6 A5 A4 A3 A2 A1 A0 DQ0 DQ1 DQ2 GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 VCC WE NC A8 A9 A11 OE A10 CE DQ7 DQ6 DQ5 DQ4 DQ3 • 10 years minimum data retention in the absence of external power • Data is automatically protected during power loss • Directly replaces 8K x 8 volatile static RAM or EEPROM • Unlimited write cycles • Low-power CMOS • JEDEC standard 28–pin DIP package • Read and write access times as fast as 150 ns • Full ±10% operating range • Optional industrial temperature range of –40°C to +85°C, designated IND 28–PIN ENCAPSULATED PACKAGE 720 MIL EXTENDED PIN DESCRIPTION A0–A12 DQ0–DQ7 CE WE OE VCC GND NC – – – – – – – [ ... ]

DS1225Y PDF Datasheet Download