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DS90LV027AQ-Q1: input with Schmitt-Triggers?

Christian Sch.
Prodigy 90 points
Part Number: DS90LV027AQ-Q1

Hi,

has the DS90LV027AQ-Q1 Schmitt-Triggers at its both data inputs? The thresholds are defined in the datasheet (<0.8 V, >2.0 V), but it is not mentioned, if there is a hysteresis.

Would it be OK to put RC low-pass filters at the inputs and to pass relatively slowly the input voltage range?

Thanks

Chris

  • 0
    Guru 316470 points

    I guess the datasheet would mention such a useful feature, so you have to assume that the input edges must be fast.

    An LPF with a time constant of 33 ns would be OK, but if you want a stronger filter, you'd need to insert a Schmitt-trigger buffer.

  • 0
    TI__Genius 15321 points

    Hi Chris,

    This device does not implement a Schmitt-Trigger feature. It is important to ensure that the device input is not slow or noisy.

    Note that this device was characterized using a generator waveform with tr ≤ 1 ns, tf ≤ 1 ns (per footnote (4)).

    This is a helpful application brief describing Schmitt-Triggers, and mentions TI devices that implement this feature. 

    Understanding Schmitt Triggers (Rev. A) (ti.com)

    Regards, Amy