PDF of 259 KB whose name, 24c02a-16a, suggests a combined datasheet covering a family of 24-series I2C EEPROMs from the 24C02A through the 24C16A range. Capacities in such a family run from 2 Kbit (256 bytes) to 16 Kbit (2 KB), and the shared sheet explains how addressing differs between sizes. No device or board is stated. It helps when identifying an unknown 24-series chip or setting the right type in programmer software. Read and save the original contents before writing anything.
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.