Forum Discussion

ivar_svendsen's avatar
ivar_svendsen
Icon for New Contributor rankNew Contributor
2 years ago

Cyclone 10LP 1.8V specifications

Hello, I am reviewing a design for digital IO compatibility. The Cyclone 10LP Datasheet specify VOH=VCCIO-0.45V and VOL=0.45V at 2 mA. This seem incompatible with some 1.8V devices that require 20%...
Configuration
ivar_svendsen's avatar
ivar_svendsen
Icon for New Contributor rankNew Contributor
2 years ago

After a long time, I am able to follow up on this topic.

I will try to rephrase my question:

At 1.8V, the IO has JEDEC8-7 compliance.

JESD8-7A output is 0.45V (low) and VDD-0.45V (high).

However, I have found several other logic circuits claiming to be "1.8V LVCMOS" or "1.8V LVTTL" compatible, with stricter IO thresholds.
This other logic require 0.3V (low) and 0.8*VDD = VDD-0.36V (high).

The question is what spec is that other logic, and is it actually compatible with the Cyclone 10LP (JESD8-7)?

Ivar Svendsen.