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SN74ALS193A 데이터시트(PDF) 4 Page - Texas Instruments |
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SN74ALS193A 데이터시트(HTML) 4 Page - Texas Instruments |
4 / 15 page SN54ALS193A, SN74ALS193A SYNCHRONOUS 4BIT UP/DOWN BINARY COUNTERS WITH DUAL CLOCK AND CLEAR SDAS211C − DECEMBER 1982 − REVISED JULY 1996 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 typical clear, load, and count sequence the following sequence is illustrated below: 1. Clear outputs to zero 2. Load (preset) to binary 13 3. Count up to 14, 15 (carry), 0, 1, and 2 4. Count down to 1, 0 (borrow), 15, 14, and 13 0 A B C D UP DOWN QA QD QC QB Count Up Count Down 13 0 2 11 0 Data Inputs CLR Data Outputs LOAD CO BO 14 15 15 14 13 Sequence Illustrated Clear Preset NOTES: A. Clear overrides load, data, and count inputs. B. When counting up, count-down input must be high; when counting down, count-up input must be high. |
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