PDF datasheet of 128 KB carrying only the document number 3323 in its name; the specific component is not identified by the title. Open the file in a PDF viewer and read the header to learn which part and manufacturer it belongs to. Such datasheets supply pin descriptions, absolute maximum ratings and recommended operating conditions. On the bench they help verify supply voltages, locate signal pins for probing and choose an equivalent part, provided the marking on the chip matches the documented device.
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 @datasheet. 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.