This part is a kind of semiconductor called 24C021.

Function of this product has CAT24C021.

Manufacturers : Catalyst Semiconductor

Image and pinout :

Some of the text within the PDF file :

www.DataSheet.co.kr Advanced CAT24C161/162(16K), CAT24C081/082(8K) CAT24C041/042(4K), CAT24C021/022(2K) Supervisory Circuits with I2C Serial CMOS E2PROM, Precision Reset Controller and Watchdog Timer FEATURES s Watchdog Timer on SDA for 24CXX1 s Programmable Reset Threshold s 400 KHz I2C Bus Compatible s 2.7 to 6 Volt Operation s Low Power CMOS Technology s 16 - Byte Page Write Buffer s Built-in inadvertent write protection s s s s s Active High or Low Reset Outputs VCC Lock Out 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, [ ... ]

24C021 PDF Datasheet Download