Datasheet PDF of 161 KB for the Microchip 24LC64B, though the catalogue labels it a schematic. It describes a 64 Kbit two-wire serial EEPROM, with pin functions, device addressing, write protect behaviour, page write size and electrical characteristics. Relevant whenever a board stores settings or serial data in such a chip and it has to be read, cloned or swapped. Check the full marking on the package against this sheet, choose the matching programmer profile, and save a dump of the original data first.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @cyberlanelectonik. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.