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AM26LS32A: AM26LS32ACN vs AM26LS33ACN - What's the difference?

twelve12pm
Genius 4455 points
Part Number: AM26LS32A
Other Parts Discussed in Thread: AM26LS33A

I seem to recall reading that AM26LS33* is a newer improved version of AM26LS32*. What is the difference between them? After poring over the datasheet several times, the only difference I see is in parameters V_IT+ and V_IT- on page 5, table 6.5, "Electrical Characteristics." These are the positive-going input threshold voltage and negative-going input threshold voltage, respectively. But I don't see any other difference. What (if any) other differences are there? Also, what would be the advantage of choosing one part or the other?

Thanks

  • 0
    TI__Guru 62910 points

    Hello,

    Compared to AM26LS32A, the AM26LS33A device trades off sensitivity (the VIT specification you pointed out) with common mode range (as shown in the "VIC" specification in the datasheet's Recommended Operating Conditions table).  This means that it could be a better fit in applications that involve communication between different power/ground domains since it could accommodate a larger offset in ground reference potentials between nodes.  The reduced sensitivity (500 mV rather than 200 mV) would mean that it is not fully compliant to the RS-422 standard requirements, though, and may be a worse fit in applications involving longer cables that might substantially attenuate the transmitted signals.  Because of this, in most cases I would recommend AM26LS32A unless there is a specific reason why the wider common mode range would be beneficial.

    If you have any further questions please just let us know.

    Regards,
    Max

  • 0 in reply to Max Robertson
    Genius 4455 points

    Thank you for clarifying that.