Altera Corporation 4–37
June 2006 Stratix Device Handbook, Volume 2
Selectable I/O Standards in Stratix & Stratix GX Devices
Figure 4–22. Current Draw Limitation Guidelines
Any 10 consecutive I/O pads cannot exceed 200 mA in thermally
enhanced FineLine BGA and thermally enhanced BGA cavity up
packages or 164 mA in non-thermally enhanced cavity up and non-
thermally enhanced FineLine BGA packages.
For example, consider a case where a group of 10 consecutive pads are
configured as follows for a thermally enhanced FineLine BGA and
thermally enhanced BGA cavity up package:
■ Number of SSTL-3 Class I output pads = 3
■ Number of GTL+ output pads = 4
■ The rest of the surrounding I/O pads in the consecutive group of 10
are unused
In this case, the total current draw for these 10 consecutive I/O pads
would be:
(# of SSTL-3 Class I pads × 8 mA) +
(# of GTL+ output pads × 34 mA) = (3 × 8 mA) + (4 × 34 mA) = 160 mA
In the above example, the total current draw for all 10 consecutive I/O
pads is less than 200 mA.
GND
VCC
I/O Pin Sequence
of an I/O Bank
Any 10 Consecutive I/O Pins,
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