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SN74HC191 Datasheet(PDF) 4 Page - Texas Instruments |
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SN74HC191 Datasheet(HTML) 4 Page - Texas Instruments |
4 / 21 page SN54HC191, SN74HC191 4BIT SYNCHRONOUS UP/DOWN BINARY COUNTERS SCLS121D − DECEMBER 1982 − REVISED OCTOBER 2003 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 typical load, count, and inhibit sequence The following sequence is illustrated below: 1. Load (preset) to binary 13 2. Count up to 14, 15 (maximum), 0, 1, and 2 3. Inhibit 4. Count down to 1, 0 (minimum), 15, 14, and 13 Data Inputs Data Outputs LOAD A B C D CLK D/U CTEN MAX/MIN QA QB QC QD Load Count Up Inhibit 13 14 15 0 1 2 RCO Count Down 2 21 0 15 14 13 |
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