Cyclone V Device Datasheet

ID 683801
Date 5/23/2023
Public
Document Table of Contents

Maximum Allowed Overshoot and Undershoot Voltage

During transitions, input signals may overshoot to the voltage listed in the following table and undershoot to –2.0 V for input currents less than 100 mA and periods shorter than 20 ns.

The maximum allowed overshoot duration is specified as a percentage of high time over the lifetime of the device. A DC signal is equivalent to 100% duty cycle.

For example, a signal that overshoots to 4.00 V can only be at 4.00 V for ~15% over the lifetime of the device; for a device lifetime of 10 years, this amounts to 1.5 years.

Table 3.  Maximum Allowed Overshoot During Transitions for Cyclone® V DevicesThis table lists the maximum allowed input overshoot voltage and the duration of the overshoot voltage as a percentage of device lifetime.
Symbol Description Condition (V) Overshoot Duration as % of High Time Unit
Vi (AC) AC input voltage 3.8 100 %
3.85 68 %
3.9 45 %
3.95 28 %
4 15 %
4.05 13 %
4.1 11 %
4.15 9 %
4.2 8 %
4.25 7 %
4.3 5.4 %
4.35 3.2 %
4.4 1.9 %
4.45 1.1 %
4.5 0.6 %
4.55 0.4 %
4.6 0.2 %

For an overshoot of 3.8 V, the percentage of high time for the overshoot can be as high as 100% 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.

Figure 1.  Cyclone® V Devices Overshoot Duration