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AM26LV32E: Clarification of Vih

The Inductor Conductor
Prodigy 50 points
Part Number: AM26LV32E

AM26LV32E specifies a range for Vih (2Vmin 5.5Vmax).  How is this interpreted? I have two theories, are either of these correct - if so which one?

A) If i provide a differential signal between 2 and 5.5V i'm guaranteed across of all your batches of this part that that will result in a high?

B) There are tolerances across your batches/lots and some parts I need to exceed 2V differential to generate a high output and some parts I need to exceed 5.5V differential to generate a high output? 

 

  • 0
    TI__Guru 62920 points
    Hello,

    VIH actually refers to the logic input pins (i.e., G and /G). The way to read this is that any single-ended input greater than 2 V will be interpreted as a logic high (for all devices), but that we don't recommend for the voltage to exceed 5.5 V.

    If you want to know about the differential input sensitivity (i.e., the input thresholds for the RS-422 inputs), you should refer to a few different specs:

    VIT+: a maximum value of 200 mV means that a differential input greater than 200 mV will be sure to be interpreted as a high-level input.

    VIT-: a minimum value of -200 mV means that a differential input less than -200 mV will be sure to be interpreted as a low-level input.

    VID: a range of -7 V to +7 V indicates that we do not recommend for the differential input signal amplitude to exceed 7 V.

    Does this all make sense? Let me know if not.

    Regards,
    Max