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SN65HVS880/5 - Compatible with 5V CMOS Logic

Benjamin Moore
Mastermind 30760 points
Other Parts Discussed in Thread: SN65HVS880, CD54HC166, CD74HC166, SN65HVS885

Hello Team,

I was taking a look at the SN65HVS88x devices for a system I'm working on that needs an 8-input digital serializer that is approximately compatible with 5V CMOS logic and can tolerate inputs up to 24V.

I believe that the SN65HVS880/5 is capable of handling part of this requirement (8-input and 24V tolerant), but I don't think it will meet the logic detection requirement.

My understanding is that the 'Field Input (low/high)-State Input Voltage' spec determines when a '0' or '1' will be triggered by an input, and this is off for both.

Are there any serializers that would meet all of my requirements? Is there perhaps an alternate route that I should consider for handling both?

Best Regards,

Ben

  • 0
    TI__Intellectual 2855 points
    Hi Benjamin Moore,

    Yes you are right, SN65HVS880/5 cannot be used with CMOS logic inputs as it will not meet the logic detection requirement.

    I dont find any serializer that would meet all requirements mentioned, still you may have a look at CD54HC166/ CD74HC166 (Parallel in/serial out shift registers) that would support CMOS logic but not 24v tolerance.

    To understand the requirement better, what is the application? why 24v tolerance is required?

    Regards
    Tejas H
  • 0 in reply to Tejas Hommaradi
    TI__Mastermind 30760 points
    Hello Tejas,

    I know a little more about the inputs I'll be interfacing with. I need a setup that will detect low/high logic states for both 24V and 5V digital outputs and serialize them. The original hope was that by changing Rlim on the SN65HVS880/5, the logic thresholds could be adjusted.

    It seems that translating the 24V to a 5V level would be difficult if I were to just use the CD54HC166/CD74HC166. Do you know if there would be a good way to do this?

    Perhaps I could use the SN65HVS885 together and separate the different types of inputs, but I would prefer a simpler solution.

    Thank you,
    Ben
  • 0 in reply to Benjamin Moore
    TI__Intellectual 2855 points
    Hi Benjamin Moore,

    I did look at options that would meet the requirement, But don't have any immediate suggestions
    I will share if find something that match the requirement.

    Regards
    Tejas H