Nexperia B.V. Counters, Dividers 74HC191D,652

The 74HC191D 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 in either direction. The counter can be preset to any desired value via the parallel load input when it is LOW, overriding the counting function. Counting is controlled by the count enable input, which must be LOW for counting to occur on the clock's rising edge. 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 and ripple clock outputs, which facilitate multistage counter configurations. The 74HC191D is specified for operation in temperatures ranging from -40 °C to +125 °C and complies with JEDEC standards for input levels and ESD protection. The product is packaged in a 16-lead SO package, making it suitable for various electronic applications where compact size and reliable performance are essential.