EP4CE55 datasheet(3/42 Pages) ALTERA

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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

AC Input

Voltage

VI = 4.20

100

VI = 4.25

VI = 4.30

VI = 4.35

VI = 4.40

VI = 4.45

VI = 4.50

VI = 4.55

VI = 4.60

Figure 1–1. Cyclone IV Devices Overshoot Duration

3.3 V

4.3 V

4.4 V

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