Chapter 1: Cyclone III Device Data Sheet
1–3
Electrical Characteristics
Table 1–2. Cyclone III Devices Maximum Allowed Overshoot During Transitions over a 10-Year Time
Frame (Note 1)
Symbol Parameter
Condition
VI = 3.95 V
VI = 4.0 V
Overshoot Duration as % of High Time
Unit
%
%
%
%
%
%
%
%
%
%
%
%
%
%
100
95.67
55.24
31.97
18.52
10.74
6.23
VI = 4.05 V
VI = 4.10 V
VI = 4.15 V
VI = 4.20 V
VI = 4.25 V
VI = 4.30 V
VI = 4.35 V
VI = 4.40 V
VI = 4.45 V
VI = 4.50 V
VI = 4.60 V
VI = 4.70 V
AC Input
Voltage
Vi
3.62
2.1
1.22
0.71
0.41
0.14
0.047
Note to Table 1–2:
(1) Figure 1–1 shows the methodology to determine the overshoot duration. In the example in Figure 1–1, overshoot
voltage is shown in red and is present on the input pin of the Cyclone III device at over 4.1 V but below 4.2 V. From
Table 1–1, for an overshoot of 4.1 V, the percentage of high time for the overshoot can be as high as 31.97% over
a 10-year period. Percentage of high time is calculated as ([delta T]/T) × 100. This 10-year period assumes 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.
© January 2010 Altera Corporation
Cyclone III Device Handbook, Volume 2
ALTERA [ ALTERA CORPORATION ]
