synchronous 4-bit up/down counter.
s Counts binary s Single down/up count control line s Count enable control input s Ripple clock output for cascading s Asynchronously presettable with load control s Para.
s Average propagation delay 20 ns s Typical clock frequency 25 MHz s Typical power dissipation 100 mW
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Or.
The DM74LS191 circuit is a synchronous, reversible, up/ down counter. Synchronous operation is provided by having all flip-flops clocked simultaneously, so that the outputs change simultaneously when so instructed by the steering logic. This mode of .
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