PDF datasheet for the STK672-050, one of the STK672 series of thick-film hybrid stepper motor driver ICs associated with Sanyo. The 209 KB document should provide the pin assignment, electrical characteristics, timing of the control inputs and a typical connection diagram. On a repair bench it helps verify motor supply and logic voltages, measure the phase outputs and look for shorted output stages. Different suffixes in this family are not always interchangeable, so match the marking on the part before ordering a substitute.
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.
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The standard format for schematics, block diagrams, power-sequence charts and service manuals.