Listed as a schematic, this 524 KB PDF carries the part numbers 25AA080A/B and 25LC080A/B, the Microchip 8 Kbit SPI EEPROM family, so its content is a component datasheet. It should give the package drawings, pinout, command opcodes, page write size and timing for the A and B variants. Useful when a small configuration memory needs to be read, cloned or replaced, and when comparing a substitute part. Confirm the exact suffix printed on the chip, since variants differ, and back up the original contents before programming.
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.