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CD74HCT191M Datasheet(PDF) 9 Page - Texas Instruments |
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CD74HCT191M Datasheet(HTML) 9 Page - Texas Instruments |
9 / 31 page CD54HC190, CD74HC190 CD54HC191, CD74HC191, CD54HCT191, CD74HCT191 SYNCHRONOUS UP/DOWN COUNTERS WITH DOWN/UP MODE CONTROL SCHS275E − MARCH 2002 − REVISED OCTOBER 2003 9 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 typical load, count, and inhibit sequence for ’HC191 and ’HCT191 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 L H H L H L |
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