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Altera_Forum
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11 years ago

No ground pin in Max V 5M80ZE64I5N CPLD

We are planning to use Altera Max V 5M80ZE64I5N CPLD in oneof our designs. We need 54 user I/O’s in the design. As per the link https://www.altera.com/content/dam/altera-www/global/en_us/pdfs...
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Altera_Forum
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11 years ago

Most IC have a ground pad on the bottom. Even some op-amps have it.

Basically it is recommended to connect it to the PCB grounding so that your IC have the lowest impedance path to system GND.

It does not relate with your available IO pins. You will still have 54 I/Os.

I dont really agree that "not for thermal purposes" as we use it for thermal dissipation too, though not effective unless you have a multi layer board with vias to the another big piece of GND plane.