Datasheet Schematic 7490

The Integrated Circuit 7490 is a Decade Counter in a 14-Pin Package (DIL / SMD)
Similiar Devices / Second Source
74F90
74ALS90
74LS90
74HC90
74HCT90
74LVX90

Here you may find Schematic Diagram for DIY, Datasheet, Pinout as well as further Information on the Integrated Circuit 7490

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