This part is a kind of semiconductor called DS1302.

Function of this product has Trickle Charge Timekeeping Chip.

Manufacturers : Dallas

Image and pinout :

Some of the text within the PDF file :

DS1302 Trickle-Charge Timekeeping Chip www.maxim-ic.com FEATURES Real-Time Clock Counts Seconds, Minutes, Hours, Date of the Month, Month, Day of the Week, and Year with Leap-Year Compensation Valid Up to 2100 31 x 8 RAM for Scratchpad Data Storage Serial I/O for Minimum Pin Count 2.0V to 5.5V Full Operation Uses Less than 300nA at 2.0V Single-Byte or Multiple-Byte (Burst Mode) Data Transfer for Read or Write of Clock or RAM Data 8-Pin DIP or Optional 8-Pin SO for Surface Mount Simple 3-Wire Interface TTL-Compatible (VCC = 5V) Optional Industrial Temperature Range: -40°C to +85°C DS1202 Compatible Underwriters Laboratory (UL) Recognized ORDERING INFORMATION PART TEMP RANGE PIN-PACKAGE DS1302 DS1302+ 0°C to +70°C 0°C to +70°C 8 PDIP (300 mils) 8 PDIP (300 mils) DS1302N -40° [ ... ]

DS1302 PDF Datasheet Download