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The potential voltage level of VIL and VIH for TMS570LS2125.

Nomo
Guru 16800 points
Other Parts Discussed in Thread: TMS570LS2125

Hi,

Could you teach me the potential voltage level of VIL and VIH for TMS570LS2125?
In the datasheet, VIL(MAX)=0.8V and VIH(MIN)=2.0V are described,
but I think the real thresholds are higher or lower.
The background of this suggestion is that
I must know whether the logic level is clamped and stable when the terminations are shorted.
For example, in case the pull-down termination and the VDD are shorted and the input voltage of the pull-down termination is 0.9V,
if the potential voltage level of VIL is 0.9V,
I can claim the MCU will treat it as low and the logic level is clamped and stable.

Thanks

Nomoto

  • 0
    TI__Guru 59540 points

    Hello Nomoto-san,

    The limits given in the datasheet are worst case across process, voltage and temperature. In other words, in the worst case combination of voltage, temperature, and material physical properties, the maximum input voltage guaranteed to result in a low being observed on the pin is 0.8V. This means that in the case of 0.9V input, some devices could see this as a low but it would not be guaranteed for all devices due to manufacturing variation in the material and the natural variation of temperature and voltage within your application.

    Likewise, for VIH, a voltage of 2.0V would guarantee that the input is seen as a high for all devices accross the variation in material (process), temperature, and voltage.

     

  • 0 in reply to Chuck Davenport
    TI__Guru 59540 points

    Hello Nomoto-san,

    I ran across this thread when reviewing forum threads that have lingered in the open status for a long time. given the time since the last activity, I assume your question has been answered. If any new or additional questions related to this topic come up, please feel free to open a new thread.