DM74S257 series datasheets. Manufacturer: Fairchild Semiconductor.

DM74S257CW Quad 3-STATE 2-to-1 Line Data Selector/Multiplexer Datasheet*) DM74S257N Quad 3-STATE 2-to-1 Line Data Selector/Multiplexer in 16-pin MDIP package. Datasheet*) DM74S257 3-STATE Quad 1-of-2 Data Selector/Multiplexer Datasheet*) There are other manufacturers for this components. For more information please check DM74S257 (National Semiconductor)

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