Altera Cyclone IV Device Handbook page 449

Chapter 1: Cyclone IV Device Datasheet
Operating Conditions
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.
Table 1–2. Maximum Allowed Overshoot During Transitions over a 10
Cyclone IV Devices
Symbol
V
i
Figure 1–1
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
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.
Figure 1–1. Cyclone IV Devices Overshoot Duration
December 2016 Altera Corporation
Parameter Condition (V)
V = 4.20
I
V = 4.25
I
V = 4.30
I
V = 4.35
I
AC Input
V = 4.40
I
Voltage
V = 4.45
I
V = 4.50
I
V = 4.55
I
V = 4.60
I
shows the methodology to determine the overshoot duration. The
4.4 V
4.3 V
3.3 V
Overshoot Duration as % of High Time
100
98
65
43
29
20
13
9
6
Table 1–2, for an overshoot of 4.3 V, the
DT
T
1–3
- Year Time Frame for
Unit
%
%
%
%
%
%
%
%
%
Cyclone IV Device Handbook,
Volume 3