Programmable Devices
CPLDs, FPGAs, SoC FPGAs, Configuration, and Transceivers
Announcements
FPGA community forums and blogs on community.intel.com are migrating to the new Altera Community and are read-only. For urgent support needs during this transition, please visit the FPGA Design Resources page or contact an Altera Authorized Distributor.
21615 Discussions

Power supply question for EP3C16 Device?

Altera_Forum
Honored Contributor II
‎11-11-2008 08:26 PM
1,089 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,
0 Kudos

Link Copied

2 Replies
Altera_Forum
Honored Contributor II
‎11-11-2008 10:26 PM
373 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.

0 Kudos
Copy link
Altera_Forum
Honored Contributor II
‎11-11-2008 10:29 PM
373 Views

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

0 Kudos
Copy link
Reply

Community support is provided Monday to Friday. Other contact methods are available here.

Intel does not verify all solutions, including but not limited to any file transfers that may appear in this community. Accordingly, Intel disclaims all express and implied warranties, including without limitation, the implied warranties of merchantability, fitness for a particular purpose, and non-infringement, as well as any warranty arising from course of performance, course of dealing, or usage in trade.

For more complete information about compiler optimizations, see our Optimization Notice.