The 74F191 is a 4-bit binary counter with synchronous, reversible counting, asynchronous parallel load capability, cascadable without external logic, and single up/down control input
The Philips 74F191 is a 4-bit binary counter containing four edge-triggered master/slave flip-flops with internal gating and steering logic. It provides asynchronous preset and synchronous count-up and count-down operations, along with asynchronous parallel load capability. The device features a single up/down control input and is designed for high-speed operation with a typical frequency of 125MHz.
The datasheet details the logic symbol, pin configuration, and functional tables for mode selection and terminal count/ripple clock outputs. It includes absolute maximum ratings, recommended operating conditions, and comprehensive DC and AC electrical characteristics, including propagation delays and setup/hold times for various input and output conditions.
| Product Type | 4-bit binary counter |
|---|---|
| Supply Voltage (Nominal) | 5.0 V |
| Operating Temperature Range | 0 to +70 °C |
| Maximum Supply Current | 55 mA |
Yes, the device is cascadable without external logic.
Information on parallel data inputs is loaded into the counter and appears on outputs when the Parallel Load (PL) input is Low.