74AC191 Description
74AC191 Up/Down Counter with Preset and Ripple Clock November 1988 Revised November 1999 74AC191 Up/Down Counter with Preset and Ripple Clock Genera.
The AC191 is a reversible modulo 16 binary counter.
74AC191 Features
* synchronous counting and asynchronous presetting. The preset feature allows the AC191 to be used in programmable dividers. The Count Enable input, the Terminal Count output and the Ripple Clock output make possible a variety of methods of implementing multistage counters. In the counting modes, stat
74AC191 Applications
* is the timing skew between state changes in the first and last stages. This represents the cumulative delay of the clock as it ripples through the preceding stages. A method of causing state changes to occur simultaneously in all stages is shown in Figure 2. All clock inputs are driven in parallel
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