54LS190 counters equivalent, synchronous 4-bit up/down counters.
Y Y Y Y Y Y Y Y Y Y
Counts 8-4-2-1 BCD or binary Single down up count control line Count enable control input Ripple clock output for cascading Asynchronously presettabl.
Average propagation delay 20 ns Typical clock frequency 25 MHz Typical power dissipation 100 mW
Connection Diagram
Dual.
These circuits are synchronous reversible up down counters The LS191 is a 4-bit binary counter and the LS190 is a BCD counter Synchronous operation is provided by having all flip-flops clocked simultaneously so that the outputs change simultaneously .
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