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SN74AS869DWR 数据表(PDF) 7 Page - Texas Instruments |
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SN74AS869DWR 数据表(HTML) 7 Page - Texas Instruments |
7 / 27 page SN54AS867, SN54AS869 SN74ALS867A, SN74ALS869, SN74AS867, SN74AS869 SYNCHRONOUS 8-BIT UP/DOWN COUNTERS SDAS115C – DECEMBER 1982 – REVISED JANUARY 1995 7 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 typical clear, preset, count, and inhibit sequences The following sequence is illustrated below: 1. Clear outputs to zero (SN74ALS867A and ′AS867 are asynchronous; SN74ALS869 and ′AS869 are synchronous.) 2. Preset to binary 252 3. Count up to 253, 254, 255, 0, 1, and 2 4. Count down to 1, 0, 255, 254, 253, and 252 5. Inhibit C Async Clear D E F CLK ENP ENT QA QB QC QD RCO Data Inputs Outputs QE QF QG QH Count Down G H B A S1 S0 Preset Sync Clear 252 253 255 254 255 254 253 252 01 21 0 Count Up Inhibit† † ENT and ENP both must be low for counting to occur. |
类似零件编号 - SN74AS869DWR |
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类似说明 - SN74AS869DWR |
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