This part is a kind of semiconductor called CAT24C321.

Function of this product has Supervisory Circuits with I2C Serial CMOS E2PROM/ Precision Reset Controller and Watchdog Timer.

Manufacturers : Catalyst Semiconductor

Image and pinout :

Some of the text within the PDF file :

Advanced CAT24C321/322(32K), CAT24C641/642(64K) Supervisory Circuits with I2C Serial CMOS E2PROM, Precision Reset Controller and Watchdog Timer FEATURES s Watchdog Timer on SDA for 24C321/641 s Programmable Reset Threshold s s s s s s Active High or Low Reset Outputs 400 KHz I2C Bus Compatible 2.7 to 6 Volt Operation Low Power CMOS Technology 32 - Byte Page Write Buffer Built-in inadvertent write protection VCC Lock Out s s s s Precision Power Supply Voltage Monitoring 5V, 3.3V and 3V options 1,000,000 Program/Erase Cycles 100 Year Data Retention 8-Pin DIP or 8-Pin SOIC Commercial, Industrial and Automotive Temperature Ranges DESCRIPTION The CAT24CXXX is a single chip solution to three popular functions of EEPROM memory, precision reset controller and watchdog timer. The [ ... ]

CAT24C321 PDF Datasheet Download