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AT89C51AC3-RDTIM 数据表(PDF) 131 Page - ATMEL Corporation |
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AT89C51AC3-RDTIM 数据表(HTML) 131 Page - ATMEL Corporation |
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131 / 143 page  131 AT89C51AC3 4383B–8051–01/05 External Clock Drive Waveforms AC Testing Input/Output Waveforms AC inputs during testing are driven at VCC - 0.5 for a logic “1” and 0.45V for a logic “0”. Timing measurement are made at VIH min for a logic “1” and VIL max for a logic “0”. Float Waveforms For timing purposes as port pin is no longer floating when a 100 mV change from load voltage occurs and begins to float when a 100 mV change from the loaded VOH/VOL level occurs. IOL/IOH ≥ ± 20 mA. VCC-0.5V 0.45V 0.7VCC 0.2VCC-0.1 TCHCL TCLCX TCLCL TCLCH TCHCX INPUT/OUTPUT 0.2 VCC + 0.9 0.2 VCC - 0.1 VCC -0.5V 0.45V FLOAT VOH - 0.1 V VOL + 0.1 V VLOAD VLOAD + 0.1 V VLOAD - 0.1 V |
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