MM54HCT190 series datasheets. Manufacturer: National Semiconductor.

MM54HCT190 Level changes on Enable or Down/Up can be made regardless of the level of the clock Datasheet*) MM54HCT191 Level changes on Enable or Down/Up can be made regardless of the level of the clock Datasheet*) MM74HCT190 Level changes on Enable or Down/Up can be made regardless of the level of the clock Datasheet*) MM74HCT191 Level changes on Enable or Down/Up can be made regardless of the level of the clock Datasheet*)

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