74AC191 Up/Down Counter with Preset and Ripple Clock November 1988 Revised November 1999 74AC191 Up/Down Counter with Preset and Ripple Clock General Description The AC191 is a reversible modulo 16 binary counter.
It 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, state changes are initiated by the rising edge of the clock.
Features s ICC reduced by 50% s High speed—133 MHz typical count frequency s Synchronous counting s Asynchronous p...

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