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EP3C55F780C8 Datasheet(PDF) 3 Page - Altera Corporation |
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EP3C55F780C8 Datasheet(HTML) 3 Page - Altera Corporation |
3 / 34 page Chapter 1: Cyclone III Device Datasheet 1–3 Electrical Characteristics July 2012 Altera Corporation Cyclone III Device Handbook Volume 2 1 A DC signal is equivalent to 100% duty cycle. For example, a signal that overshoots to 4.2 V can only be at 4.2 V for 10.74% over the lifetime of the device; for device lifetime of 10 years, this amounts to 10.74/10ths of a year. Figure 1–1 shows the methodology to determine the overshoot duration. Table 1–2. Cyclone III Devices Maximum Allowed Overshoot During Transitions over a 10-Year Time Frame (1) Symbol Parameter Condition Overshoot Duration as % of High Time Unit Vi AC Input Voltage VI = 3.95 V 100 % VI = 4.0 V 95.67 % VI = 4.05 V 55.24 % VI = 4.10 V 31.97 % VI = 4.15 V 18.52 % VI = 4.20 V 10.74 % VI = 4.25 V 6.23 % VI = 4.30 V 3.62 % VI = 4.35 V 2.1 % VI = 4.40 V 1.22 % VI = 4.45 V 0.71 % VI = 4.50 V 0.41 % VI = 4.60 V 0.14 % VI = 4.70 V 0.047 % Note to Table 1–2: (1) Figure 1–1 shows the methodology to determine the overshoot duration. In the example in Figure 1–1, overshoot voltage is shown in red and is present on the input pin of the Cyclone III device at over 4.1 V but below 4.2 V. From Table 1–1, for an overshoot of 4.1 V, the percentage of high time for the overshoot can be as high as 31.97% over a 10-year period. Percentage of high time is calculated as ([delta T]/T) × 100. This 10-year period assumes the device is always turned on with 100% I/O toggle rate and 50% duty cycle signal. For lower I/O toggle rates and situations in which the device is in an idle state, lifetimes are increased. Figure 1–1. Cyclone III Devices Overshoot Duration 3.3 V 4.1 V 4.2 V T ΔT |
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