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LS7055 Datasheet(PDF) 4 Page - LSI Computer Systems |
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LS7055 Datasheet(HTML) 4 Page - LSI Computer Systems |
4 / 6 page COUNTER AT MAINSIGNAL VALUE COUNTER AT PRESIGNAL VALUE COUNTER AT ZERO MAINSIGNAL OUTPUT PRESIGNAL OUTPUT ZERO DETECT OUTPUT MANUAL RESET FIGURE 2. AUTOMATIC OR MANUAL OPERATION IN UP MODE AUTOMATIC RESET COUNTER AT PRESET NUMBER COUNTER AT PRESIGNAL VALUE COUNTER AT ZERO MAINSIGNAL OUTPUT PRESIGNAL OUTPUT ZERO DETECT OUTPUT MANUAL PRESET FIGURE 3. AUTOMATIC OR MANUAL OPERATION IN DOWN MODE COUNTER AT MAINSIGNAL NUMBER AUTOMATIC PRESET TUDH Tudh Tds Tdh Tcs Tch Trpw Tppw Tdo Tdo Tgb Tgb Tdth Tiph COUNT INPUT UP/DOWN DIVIDE CONTROL COUNT INHIBIT RESET INHIBIT INTERNAL RESET PRESET ENABLE INHIBIT INTERNAL PRESET MAINSIGNAL, PRESIGNAL, ZERO DETECT OUTPUT DATA TRANSFER INPUT SCAN CLOCK INPUT MSD OUTPUT LSD +4 OUTPUT 7 SEGMENTS OUTPUTS BCD OUTPUTS STORAGE SELECT INPUTS BCD DATA INPUT * FIGURE 4. TIMING DIAGRAM * BCD data input assumed to be applied from a set of thumbwheel switches as shown in Figure 5. Tirh 7055-012703-4 |
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