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ivar_svendsen's avatar
ivar_svendsen
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3 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% for VIL (0.36V).

EDIT: Reading further, the Core Fabric handbook claims JEDEC8-7 compliance, and names both 1.8V LVTTL and LVCMOS. I guess the Cyclone 10LP may successfully those other chips, provided the current drawn is less than 100 uA (limit according to JESD8-7A).

Regards,

Ivar Svendsen.

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3 Replies

  • AqidAyman_Altera's avatar
    AqidAyman_Altera
    Icon for Regular Contributor rankRegular Contributor
    3 years ago

    Hello Ivar,


    May I know what is your main concern on the datasheet of 1.8V I/O standard specification?




  • AqidAyman_Altera's avatar
    AqidAyman_Altera
    Icon for Regular Contributor rankRegular Contributor
    3 years ago

    As we do not receive any response from you on the previous question/reply/answer that we have provided, please login to ‘https://supporttickets.intel.com’, view details of the desire request, and post a feed/response within the next 15 days to allow me to continue to support you. After 15 days, this thread will be transitioned to community support. The community users will be able to help you on your follow-up questions.


  • ivar_svendsen's avatar
    ivar_svendsen
    Icon for New Contributor rankNew Contributor
    3 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.