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SN75ALS193: variation of VID(VIT+/-)

K.Hamamoto
Guru 12155 points
Part Number: SN75ALS193

Hi

The VID is specified as VIT+ and VIT- on the datasheet (VIT+: only maximum , VIT- : only minimum)

On the other hand , how much is the variation of VIT+ and VIT-?

At the Fig. 8, VIT+ and VIT- are about +/-60mV. Are there typical value ?

 

How much can we estimate the variation of VIT+ and VIT-? (??%)

Regards,

Koji Hamamoto

  • 0
    TI__Guru 62920 points
    Hello Hamamoto-san,

    You are right that the transition voltages shown in Figure 8 correspond to the VIT levels when the device is operated under typical conditions. Across the full possible range of operating temperature, supply voltages, and manufacturing process variation, the maximum range for these VIT levels is +/- 200 mV. I don't believe we have data on the statistical spread of this parameter any longer; is there something in particular you would like to see?

    Thank you,
    Max
  • 0 in reply to Miguel Robertson
    Guru 12155 points

    Hi Max-san,

    Thank you  very much for your support.

    I  understood. 

    On the other hand, I have additional question about VID.

    At the following table, VID is defined +/-0.2V. Also VID means differential inputs (A-B).

    I think VID is not A-B. It is VIT+ or VIT-. Is that correct?

    If VID is A(VIT+) - B(VIT-) , VID is 400mV. I am confused.  

    If the above VID is just voltage level, the above 0.2V is maximum value. (typically +/-60mV as shown at Fig 8)

    Is my understanding correct?

     

    Regards,

    Koji Hamamoto

  • 0 in reply to K.Hamamoto
    TI__Intellectual 2885 points
    Hello Hamamoto-san,

    VIT+ and VIT- values are the threshold parameters of VID. When VIT+ has a max threshold of 200 mV, any voltage greater than that will be read as a high (VID ≥ 200 mV). the values of VIT+/VIT- create the "thresholds" for VID.
  • 0 in reply to Matt Mendez
    Guru 12155 points
    Hi Matt-san,

    Thank you very much for your support as always.

    Regards,
    Koji Hamamoto