74F191 Datasheet, PDF (3/7 Pages) NXP Semiconductors – Up/down binary counter with reset and ripple clock

FIGURE 1. n-Stage Counter Using Ripple Clock
FIGURE 2. Synchronous n-Stage Counter Using Ripple Carry/Borrow
FIGURE 3. Synchronous n-Stage Counter with Gated Carry/Borrow
Logic Diagram
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
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