This 553 KB PDF datasheet is identified solely by the code SDLS155, without any device name. The number belongs to the series Texas Instruments assigns to its standard logic literature, and the part covered is stated on the title page. Use it for pinouts, function tables, timing and voltage ratings and package outlines when diagnosing a logic IC or sourcing a replacement. Opens in any PDF viewer. Check the chip marking and package suffix against the ordering information before swapping parts.
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.