74191 Datasheet - National Semiconductor

74191 Synchronous Up/Down 4-Bit Binary Counter

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 logic This mode of operation eliminates the output.

74191 Features

* 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 outputs Cascadable for n-bit applications Alternate Military Aerospace device (54191) is available Contact a National Semiconductor Sale

74191 Datasheet