CD74HC191M Datasheet

Counter ICs


The CD54/ CD74HC191M are asynchronously presettable BCD decade counters, whereas the CD54/74HC191 and CD54/CD74HC191M 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 (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. CD74HC191M Features • 2-V to 6-V VCC Operation (’HC190, 191)• 4.5-V to 5.5-V VCC Operation (’HCT191)• Wide Operating Temperature Range of −55°C to 125°C• Synchronous Counting and Asynchronous Loading• Two Outputs for n-Bit Cascading• Look-Ahead Carry for High-Speed Counting• Balanced Propagation Delays and Transition Times• Standard Outputs Drive Up To 15 LS-TTL Loads• Significant Power Reduction Compared to LS-TTL Logic ICs


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