The Integrated Circuit 7440 is a Dual Quad Input NAND Buffer in a 14-Pin Package (DIL / SMD)
Similiar Devices / Second Source
74F40
74ALS40
74LS40
74HC40
74HCT40
74LVX40

Here you may find Schematic Diagram for DIY, Datasheet, Pinout as well as further Information on the Integrated Circuit 7440

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