Forum Discussion

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

3.3V LVCMOS termination absent in Cyclone V??

Hello, I looked at table 5-29: selectable i/o standards for rs oct without calibration and table 5-30: selectable i/o standards for rs oct with calibration from cyclone v device handbook, and I...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

you are right. I guess 3.3V with on-chip termination will require more current so Altera decides not to support it. Most of the time 3.0V or 2.5V will be good enough for interfacing 3.3V signal with on chip clamp diode on. I would consider to use lower voltage if OCT is really needed.