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Power dissipation for a DS26LV31T 3V Enhanced CMOS Quad Differential Line Driver

I'm trying to accurately calculate power dissipation in this package.  When looking at AN-805, I see a bunch of calculations for Pd based on measured voltages.  I would use the calculations in this app note if it weren't for the fact that it uses a different Vcc than what I'm using (5V vs. 3.3V).

 

Does anyone know where I can find the same curves used in AN-805 but with a 3.3V Vcc?  I really need the Voh, Vol, Ioh, and Iol for this device when powered by 3.3V Vcc.

 

Any and all help is appreciated.  Thanks!

  • Hi Ramzi , I will move your post to a group which supports the device.
  • Hi Ramzi,

    Since this is a legacy part, it is unlikely that we can locate the same curves as what you have found in AN-805. However, if you are interested in the VOH, VOL, IOH, and IOL from the DS26LV31T taken from the IC, you can still derive them from the datasheet. It will not be as accurate as having the exact curves as in the DS26LS31C datasheet, but it should be a start.

    The datasheet describes the outputs in terms of VOD. I would suggest using the VOD2 parameter where RL = 100-Ohms and IO >= 20 mA to get a comparable measurement to what is shown in the electrical characteristics table for the DS26LS31C for VOH and VOL.

    In the DS26LV31T, VOH = VOC + VOD2/2, and VOL = VOC - VOD2/2. Taking the typical values, we could estimate that VOH = 1.5 + 1.3 = 2.8 V and VOL = 1.5 - 1.3 = 0.2 V. I would then try comparing the output currents of the DS26LS31C curves to these VOH and VOL values for a rough estimate. It is likely that the actual curves are shifted downward to accommodate for the lower VCC, but I do not know exactly how it is affected.

    At the least, the worst case power dissipation case for this part based on packaging is documented in the Absolute Maximum Ratings of the datasheet.

    Hope this helps.

    Michael