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UT80C196 数据表(PDF) 34 Page - Aeroflex Circuit Technology |
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UT80C196 数据表(HTML) 34 Page - Aeroflex Circuit Technology |
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34 / 42 page ![]() 34 UT80C196KD XTAL1 External Clock Input Figure 9. External Clock Connections V DD 0.0V 1.4V 1.4V TEST POINTS AC Testing inputs are driven at V DD for a Logic “1” and 0.0V for a Logic “0”. Timing measure- ments are made at 1.4V. Figure 10. AC Testing Input, Output Waveforms VLOAD For timing purposes a port pin is no longer floating when it changes to a voltage outside the ref- erence points shown and begins to float when it changes to a voltage inside the reference points shown. IOL = 4mA, IOH = -4mA. VOL + 0.5V VOH - 0.5V V OL + 0.5V VOH - 0.5V TIMING REFERENCE POINTS Figure 11. Float Waveforms |
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