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54191 series datasheets. Manufacturer: National Semiconductor.

54191Synchronous Up/Down 4-Bit Binary Counter with Mode ControlDatasheet*)
54191DMQBSynchronous Up/Down 4-Bit Binary Counter with Mode ControlDatasheet*)
54191FMQBSynchronous Up/Down 4-Bit Binary Counter with Mode ControlDatasheet*)
DM74191NSynchronous Up/Down 4-Bit Binary Counter with Mode ControlDatasheet*)
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