74F191 Up/down binary counter

74F191 Up/down binary counter

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. Asynchronous parallel load capability permits the counter to be preset to any desir.

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 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. Asynchronous parallel load capability permits the counter to be preset to any desired number. Information present on the parallel data inputs (D0 - D3) is loaded into the counter .