DESCRIPTION
The 74F191 is a 4-bit binary counter. It contains four edge-triggered master/slave flip-flops with internal gating and steering logic to provide asynchronous preset and synchronous count-up and count-down operations.

FEATURES
• High speed –125MHz typical fMAX
• Synchronous, reversible counting
• 4-Bit binary
• Asynchronous parallel load capability
• Cascadable without external logic
• Single up/down control input