Datasheet in PDF for the 93C85A, a member of the 93-series Microwire serial EEPROM family, filed here under schematics. The file name gives no manufacturer, so the exact vendor and density details should be read from the document itself. These small three-wire EEPROMs store configuration data such as settings, MAC addresses or calibration values in many devices. A technician uses the sheet for pinout, organisation pin behaviour and supply voltage before reading or writing the chip with a programmer, always saving the original contents 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.