A 75.1 KB PDF titled after the 24C16 part, with a _3 suffix that likely marks a third copy or revision of the same reference sheet. Nothing in the name ties it to a specific device or board, so treat it as datasheet material for a 16 Kbit (2 KB) I2C EEPROM. Technicians use it to verify pin assignment, write-protect logic and supply voltage when servicing equipment whose settings live in this chip. Compare it with other 24C16 sheets if the vendor on the chip differs.
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.