CD54HC191 - Texas Instruments

CD54HC191 Synchronous Up/Down Counters

ordering information 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 accomplished by a low asynchronous parallel load (LOAD) input. Counting occurs when LOAD is high, count enable .

Features

y counters. Presetting the counter to the number on preset data inputs (A−D) is accomplished by a low asynchronous parallel load (LOAD) input. Counting occurs when LOAD is high, count enable (CTEN) is low, and the down/up (D/U) input is either high for down counting or low for up counting. The counter is decremented or incremented synchronously with the low-to-high transition of the clock. ORDERING INFORMATION TA PACKAGE† ORDERABLE PART NUMBER TOP-SIDE MARKING CD74HC190E CD74HC190E PDIP − E Tube of 25 CD74HC191E CD74HCT191E CD74HC191E CD74HCT191E Tube of 40 CD74HC191M SOIC − M R.