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HC1S80 Datasheet(PDF) 32 Page - Altera Corporation |
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HC1S80 Datasheet(HTML) 32 Page - Altera Corporation |
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32 / 110 page ![]() 4–8 Altera Corporation September 2008 Recommended Operating Conditions Table 4–15. GTL+ I/O Specifications Symbol Parameter Conditions Minimum Typical Maximum Unit VTT Termination voltage 1.35 1.5 1.65 V VREF Reference voltage 0.88 1.0 1.12 V VIH High-level input voltage VREF + 0.1 V V IL Low-level input voltage V REF – 0.1 V VOL Low-level output voltage IOL = 34 mA (1) 0.65 V Table 4–16. GTL I/O Specifications Symbol Parameter Conditions Minimum Typical Maximum Unit VTT Termination voltage 1.14 1.2 1.26 V VREF Reference voltage 0.74 0.8 0.86 V VIH High-level input voltage VREF + 0.05 V V IL Low-level input voltage V REF – 0.05 V VOL Low-level output voltage IOL = 40 mA (1) 0.4 V Table 4–17. SSTL-18 Class I Specifications Symbol Parameter Conditions Minimum Typical Maximum Unit V CCIO Output supply voltage 1.65 1.8 1.95 V VREF Reference voltage 0.8 0.9 1.0 V VTT Termination voltage VREF – 0.04 VREF VREF + 0.04 V VIH(DC) High-level DC input voltage VREF + 0.125 V VIL(DC) Low-level DC input voltage VREF – 0.125 V VIH(AC) High-level AC input voltage VREF + 0.275 V VIL(AC) Low-level AC input voltage VREF – 0.275 V VOH High-level output voltage IOH = –6.7 mA (1) VTT + 0.475 V VOL Low-level output voltage IOL = 6.7 mA (1) VTT – 0.475 V |
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