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AT89C51AC3-RDTIM Datasheet(PDF) 131 Page - ATMEL Corporation |
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AT89C51AC3-RDTIM Datasheet(HTML) 131 Page - ATMEL Corporation |
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131 / 140 page  131 AT89C51AC3 4383D–8051–02/08 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. V CC-0.5V 0.45V 0.7V CC 0.2V CC-0.1 T CHCL TCLCX TCLCL T CLCH TCHCX INPUT/OUTPUT 0.2 V CC + 0.9 0.2 VCC - 0.1 V CC -0.5V 0.45V FLOAT V OH - 0.1 V V OL + 0.1 V VLOAD VLOAD + 0.1 V V LOAD - 0.1 V |
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