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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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AT89C51ED2-RDTIM 数据表(PDF) 125 Page - ATMEL Corporation |
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AT89C51ED2-RDTIM 数据表(HTML) 125 Page - ATMEL Corporation |
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125 / 137 page  125 AT89C51RD2/ED2 4235E–8051–04/04 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. Clock Waveforms Valid in normal clock mode. In X2 mode XTAL2 must be changed to XTAL2/2. INPUT/OUTPUT 0.2 VCC + 0.9 0.2 VCC - 0.1 VCC -0.5V 0.45V FLOAT VOH - 0.1V V OL + 0.1V V LOAD V LOAD + 0.1V V LOAD - 0.1V |
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