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Original question:

DS16F95QML: Voh max

DS16F95QML: Regarding Voh Max

TI-CSC
Genius 11015 points
Part Number: DS16F95QML

Hello E2E Experts.

Good day.

As stated in the E2E link below, VOH max of 3.6V at VCC=5V at room temperature.

The question is: Why is it not in the datasheet?

And below snap from the datasheet shows the condition as Vcc=5.5V but

For the same in condition column Vcc=4.5V, may I ask why?

Can u clarify this?

Thank you in advance for your help.

Regards,

CSC

  • +1
    TI__Mastermind 46687 points

    Hi CSC,

    For your questions please see below:

    1. Max VOH on R outputs are not spec'd on most, I think pretty much all but there may be a few exceptions so I will leave it at most,  RS-485/RS-422 devices. As the 3.6V would be at very low current conditions which wouldn't fit the test conditions listed for the device and a max VOH with the listed test conditions may be confusing as it wouldn't reflect the true max of the device - which is going to vary based on system parameters. 

    2. The 4.5V VCC is the lowest recommended voltage - this was most likely chosen as the test point to show the "worst case" variation of these specs under recommended conditions. The FETS will have the lowest on resistance at VCC = 5.5V and the max voltage possible is higher with higher VCC. You can expect  better results if you have a higher VCC - but if using a source of 5V +/- 10% you should be designing for the worst case which is 4.5V. 

    Please let me know if you have any other questions!

    Best,

    Parker Dodson