74LS192 UP/DOWN BCD Decade Counter
High-speed synchronous UP/DOWN counter with programmable presets
- Supply Voltage: 4.5 - 5.5 V
- Operating Ambient Temperature Range: -55 to 125 °C
- Output Current — High: -0.4 mA
- High-level Output Current: 8 mA
Key Features:
- Synchronous counting operation
- Low Power consumption (95 mW)
- High Speed operation (40 MHz)
- Individual preset inputs for programming
The 74LS192 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 synchronous with the LOW-to-HIGH transitions on the clock inputs. Separate Terminal Count Up and Terminal Count Down outputs are provided which are used as the clocks for a subsequent stages without extra logic, thus simplifying multistage counter designs. Individual preset inputs allow the circuits to be used as programmable counters. Both the Parallel Load (PL) and the Master Reset (MR) inputs asynchronously override the clocks.
Low Power 95 mW Typical Dissipation
High Speed 40 MHz Typical Count Frequency
Synchronous Counting
Asynchronous Master Reset and Parallel Load
Individual Preset Inputs
Cascading Circuitry Internally Provided
Input Clamp Diodes Limit High-Speed Termination Effects
Related Document: 74LS192 SMD Data Sheet
Images are for illustration only; actual product may vary.