Datasheet in PDF for the SN74LS670N, the plastic DIP version of the 74LS670 4-by-4 register file with 3-state outputs from the low-power Schottky TTL family. At only 12.2 KB it is likely a short summary or scanned page, not the full manufacturer document. Use it to confirm pinout, supply voltage and logic levels when checking a suspect chip on vintage computer or industrial boards. Compare the marking on the package with the part number before substituting, and look for a fuller revision if timing data is missing.
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_technar_org. 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.