74HC191D
74HC191D is Presettable synchronous 4-bit binary up/down counter manufactured by Nexperia.
- Part of the 74HC191 comparator family.
- Part of the 74HC191 comparator family.
74HC191
Presettable synchronous 4-bit binary up/down counter
Rev. 7
- 14 March 2024
Product data sheet
1. General description
The 74HC191 is an asynchronously presettable 4-bit binary up/down counter. It contains four master/slave flip-flops with internal gating and steering logic to provide asynchronous preset and synchronous count-up and count-down operation. Asynchronous parallel load capability permits the counter to be preset to any desired value. Information present on the parallel data inputs (D0 to D3) is loaded into the counter and appears on the outputs when the parallel load (PL) input is LOW. This operation overrides the counting function. Counting is inhibited by a HIGH...
