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EP4CE10F17I8LN Datasheet(PDF) 3 Page - Altera Corporation |
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EP4CE10F17I8LN Datasheet(HTML) 3 Page - Altera Corporation |
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3 / 42 page  Chapter 1: Cyclone IV Device Datasheet 1–3 Operating Conditions May 2013 Altera Corporation Cyclone IV Device Handbook, Volume 3 1 A DC signal is equivalent to 100% duty cycle. For example, a signal that overshoots to 4.3 V can only be at 4.3 V for 65% over the lifetime of the device; for a device lifetime of 10 years, this amounts to 65/10ths of a year. Figure 1–1 shows the methodology to determine the overshoot duration. The overshoot voltage is shown in red and is present on the input pin of the Cyclone IV device at over 4.3 V but below 4.4 V. From Table 1–2, for an overshoot of 4.3 V, the percentage of high time for the overshoot can be as high as 65% over a 10-year period. Percentage of high time is calculated as ([delta T]/T) × 100. This 10-year period assumes that 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. Table 1–2. Maximum Allowed Overshoot During Transitions over a 10 -Year Time Frame for Cyclone IV Devices Symbol Parameter Condition (V) Overshoot Duration as % of High Time Unit Vi AC Input Voltage VI = 4.20 100 % VI = 4.25 98 % VI = 4.30 65 % VI = 4.35 43 % VI = 4.40 29 % VI = 4.45 20 % VI = 4.50 13 % VI = 4.55 9 % VI = 4.60 6 % Figure 1–1. Cyclone IV Devices Overshoot Duration 3.3 V 4.3 V 4.4 V T DT |
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