Download the SN54LS423 datasheet PDF.
This datasheet also includes the SN54LS422 variant, as both parts are published together in a single manufacturer document.
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TAPE AND REEL INFORMATION PACKAGE MATERIALS INFORMATION
14-Jul-2012 *All dimensions are nominal Device Package Package Pins Type Drawing SN74LS423NSR SO NS 16 SPQ 2000 Reel Reel A0.