The Integrated Circuit 7428 is a Quad Dual Input NOR Buffer in a 14-Pin Package (DIL / SMD)
Similiar Devices / Second Source
74F28
74ALS28
74LS28
74HC28
74HCT28
74LVX28

Here you may find Schematic Diagram for DIY, Datasheet, Pinout as well as further Information on the Integrated Circuit 7428

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