Nexperia B.V. Counters, Dividers 74HC191DB,112

The 74HC191 is a presettable synchronous 4-bit binary up/down counter designed for versatile counting applications. It features four master/slave flip-flops with internal gating and steering logic, allowing for both asynchronous presetting and synchronous counting. The counter can be preset to any desired value via its parallel load capability, which is activated when the parallel load (PL) input is LOW. Counting is controlled by the count enable (CE) input, which must be LOW for counting to occur on the rising edge of the clock (CP) input. The up/down (U/D) input determines the counting direction. This device operates within a supply voltage range of 2.0 to 6.0 V and is characterized by low power dissipation and high noise immunity. It includes terminal count (TC) and ripple clock (RC) outputs for overflow and underflow indications, facilitating multistage counter designs. The 74HC191 complies with JEDEC standards and offers robust ESD protection, making it suitable for a variety of applications. The operating temperature range is specified from -40 °C to +125 °C, ensuring reliability in demanding environments.