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21615 Discussions

Power supply question for EP3C16 Device?

Altera_Forum
Honored Contributor II
‎11-11-2008 08:26 PM
1,084 Views

Currently I am using Cyclone III EP3C16. I will use 3.3V for all VCCIO, and 1.2V for VCCINT.  

 

When I check the pin information for this device, I found that it is required that the supply (analog) voltage for PLLs uses 2.5V whether the PLLs are used or not.  

 

It is kind of weired. I don't use PLLs at all. Although, it seems that I should create a 2.5V even I don't use it. Do anyone have any experience on this device? Do I must create 2.5V just for no use? 

 

Thanks,
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Altera_Forum
Honored Contributor II
‎11-11-2008 10:26 PM
368 Views

The 2.5V has to be connected, otherwise the device is hold in reset. A customer has used a silicon diode to generate an about 2.5V voltage from 3.3V, it alsways worked without problems. The good thing with Cyclone III is, that the PLL supply is less critical than with previous families, cause the analog PLL supply has internal voltage regulators powered from VCCA.

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Altera_Forum
Honored Contributor II
‎11-11-2008 10:29 PM
368 Views

Thank you for your advice. It's really helpful.

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