SNJ54ALS191AJ Texas Instruments - Yeehing Electronics

Synchronous 4-Bit Up/Down Binary Counter

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The 'ALS191A are synchronous 4-bit reversible up/down binary counters. Synchronous counting operation is provided by having all flip-flops clocked simultaneously so that the outputs change coincidentally with each other when instructed by the steering logic. This mode of operation eliminates the output counting spikes normally associated with asynchronous (ripple-clock) counters.