CD54HC191 counters equivalent, synchronous up/down counters.
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PRODUCTION D.
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The CD54/74HC190 are asynchronously presettable BCD decade counters, whereas the CD54/74HC191 and CD54/74HCT191 are asynchronously presettable binary counters.
Presetting the counter to the number on preset data inputs (A−D) is a.
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