DM74S40 series datasheets. Manufacturer: Fairchild Semiconductor.

DM74S40CW Dual 4-Input NAND Buffer Datasheet*) DM74S40N Dual 4-Input NAND Buffer in 14-pin MDIP package. Datasheet*) DM74S40 Dual 4-Input NAND Buffer Datasheet*) There are other manufacturers for this components. For more information please check DM74S40 (National Semiconductor)

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