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TS80C58X2 Datasheet(PDF) 56 Page - ATMEL Corporation |
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TS80C58X2 Datasheet(HTML) 56 Page - ATMEL Corporation |
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56 / 62 page ![]() 56 4431E–8051–04/06 AT/TS8xC54/8X2 19.5.13 AC Testing Input/Output Waveforms Figure 19-12. 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”. 19.5.14 Float Waveforms Figure 19-13. Float Waveforms For timing purposes a 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 ≥ ± 20mA. 19.5.15 Clock Waveforms Valid in normal clock mode. In X2 mode XTAL2 signal must be changed to XTAL2 divided by two. 0.45 V VCC-0.5 V 0.2VCC+0.9 0.2VCC-0.1 INPUT/OUTPUT VOL+0.1 V VOH-0.1 V FLOAT VLOAD VLOAD+0.1 V VLOAD-0.1 V |
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