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PROASIC3E Datasheet(PDF) 22 Page - Actel Corporation

Part # PROASIC3E
Description  I/O Structures in IGLOOe and ProASIC3E Devices
PDF  37 Pages
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Manufacturer  ACTEL [Actel Corporation]
Direct Link  http://www.actel.com
Logo ACTEL - Actel Corporation

PROASIC3E Datasheet(HTML) 22 Page - Actel Corporation

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I/O Structures in IGLOOe and ProASIC3E Devices
22
v1.4
Solution 3
The board-level design must ensure that the reflected waveform at the pad does not exceed the
voltage overshoot/undershoot limits provided in the datasheet. This is a requirement to ensure
long-term reliability.
This scheme will also work for a 3.3 V PCI/PCI-X configuration, but the internal diode should not be
used for clamping, and the voltage must be limited by the bus switch, as shown in Figure 12.
Relying on the diode clamping would create an excessive pad DC voltage of 3.3 V + 0.7 V = 4 V.
Figure 12 • Solution 3
Solution 3
Requires a bus switch on the board,
LVTTL/LVCMOS 3.3 V I/Os.
I/O Input
3.3 V
5.5 V
5.5 V
Bus
Switch
IDTQS32X23



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