74191 counter equivalent, synchronous up/down 4-bit binary counter.
Y Y Y Y Y Y Y
Single down up count control line Count enable control input Ripple clock output for cascading Asynchronously presettable with load control Parallel output.
Alternate Military Aerospace device (54191) is available Contact a National Semiconductor Sales Office Distributor for s.
This circuit is a synchronous reversible up down counter The 191 is a 4-bit binary counter Synchronous operation is provided by having all flip-flops clocked simultaneously so that the outputs change simultaneously when so instructed by the steering .
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