74HC191 (4-Bit Counter)

The 74HC191 are asynchronously presettable 4-bit binary up/down counters. They contain four master/slave flip-flops with internal gating and steering logic to provide asynchronous preset and synchronous count-up and count-down operation. Specifications Synchronous reversible counting Asynchronous parallel load Count enable control for synchronous expansion Single up/down control input Output capability: standard 74HC191 datasheet