Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
19 years ago

VCCA_PLLn

I know the Stratix II device handbook says I must connect the VCCA_PLLn even if I'm not using PLLn. But do I really have to? What will happen if I don't? I want to save all the power I can.
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
19 years ago

Yes, you really have to. I think the reason behind it is that the part could get damaged if you leave the VCCA floating. If you're not using that particular PLL, it won't draw any current (except maybe leakage) anyway, so the power difference will be very minimal.