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Are all exposed pad dimensions the same for 144-pin EQFP packages in Cyclone IV devices?
Category: Specifications
tool:-
Device: Cyclone® IV
Exposed Pad dimensions are not the same even for the same package in the same device family.
Check the package information for your device in the document below.
https://www.intel.com/content/www/us/en/programmable/support/literature/lit-index/lit-pkg/package.html?family=Cyclone_IV
<Example>
EP4CE6E22 D2: 5.40mm / E2: 5.40mm (typ)
EP4CE15E22 D2: 6.70mm / E2: 6.70mm (typ)
Also, connect this exposed pad to the GND of the board.
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