向上/向下十年计数器具有独立向上/向下时钟 Up/Down Decade Counter with Separate Up/Down Clocks
General Description
The 74F192 is an up/down BCD decade 8421 counter. Separate Count Up and Count Down Clocks are used, and in either counting mode the circuits operate synchronously. The outputs change state synchronously with the LOW-to-HIGH transitions on the clock inputs.
Separate Terminal Count Up and Terminal Count Down outputs are used as the clocks for a subsequent stage without extra logic, thus simplifying multistage counter designs. Individual preset inputs allow the circuit to be used as a programmable counter. Both the Parallel Load PL and the Master Reset MR inputs asynchronously override the clocks.
Features
■ Guaranteed 4000V minimum ESD protection