TheSN54/74LS192 is an UP/DOWN BCD Decade (8421) Counter and the SN54/74LS193 is an UP/DOWN MODULO-16 Binary Counter. Separate CountUp 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.
1. Low Power : 95 mW Typical Dissipation 2. High Speed : 40 MHz Typical Count Frequency 3. Synchronous Counting 4. Asynchronous Master Reset and Parallel Load 5. Individual Preset Inputs 6. Cascading Circuitry Internally Provided 7. Input Clamp Diodes Limit High Speed Termination Effects
Other data sheets within the file : SN74LS192, 54LS192, 54LS192J, 54LS193, 54LS193J
This circuit is a synchronous up/down 4-bit binary counter. Synchronous operation is provided by having all flip-flops clocked simultaneously, so that the outputs change together when so instructed by the steering logic. This mode of operation eliminates the output counting spikes normally as sociated with asynchronous (ripple-clock) counters.
The outputs of the four master-slave flip-flops are triggered by a low-to-high level transition of either count (clock) input. The direction of counting is determined by which count input is pulsed while the other count input is held high.