标签: 74ls168
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74LS168.pdf54LS168SynchronousBi-DirectionalBCDDecadeCounterJune198954LS168SynchronousBi-DirectionalBCDDecadeCounterGeneralDescriptionThe54LS168isafullysynchronous4-stateupdowncoun-terfeaturingapresetcapabilityforprogrammableoperationcarrylookaheadforeasycascadingandaUDinputtocon-trolthedirectionofcountingItcountsintheBCD(8421)sequenceandallstatechangeswhetherincountingorpar-allelloadingareinitiatedbytheLOW-to-HIGHtransitionoftheclock……
