Maximum Allowed Overshoot and Undershoot Voltage
During transitions, input signals may overshoot to the voltage listed in the following table and undershoot to –1.1 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, when using VCCIO = 1.8 V, a signal that overshoots to 2.44 V for LVDS I/O can only be at 2.44 V for ~6% over the lifetime of the device.
|Symbol||Description||LVDS I/O (V) 8||Overshoot Duration as % at TJ = 100°C||Unit|
|Vi (AC)||AC input voltage||VCCIO + 0.30||100||%|
|VCCIO + 0.35||60||%|
|VCCIO + 0.40||30||%|
|VCCIO + 0.45||20||%|
|VCCIO + 0.50||10||%|
|VCCIO + 0.55||6||%|
|> VCCIO + 0.55||No overshoot allowed||—|
|Symbol||Description||3 V I/O (V)||Overshoot Duration as % at TJ = 100°C||Unit|
|Vi (AC)||AC input voltage||VCCIO + 0.65||100||%|
|VCCIO + 0.70||42||%|
|VCCIO + 0.75||18||%|
|VCCIO + 0.80||9||%|
|VCCIO + 0.85||4||%|
|> VCCIO + 0.85||No overshoot allowed||—|
|Symbol||Description||3.3 V I/O (V)||Overshoot Duration as % at TJ = 100°C||Unit|
|Vi (AC)||AC input voltage||VCCIO + 0.33||100||%|
|VCCIO + 0.41||60||%|
|VCCIO + 0.47||40||%|
|VCCIO + 0.69||10||%|
|VCCIO + 0.95||2||%|
|> VCCIO + 0.95||No overshoot allowed||—|
For an overshoot of 2.5 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.
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