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SN74LVC2G14: SN74LVC2G14 VT+ & VT- RANGE in VCC 3V

Chao Fu Chen
Intellectual 1110 points
Part Number: SN74LVC2G14

Hi Expert,

I have a question about the material SN74LVC2G14.
Is the following understanding of the VT+ and VT- specifications in the following specification sheets correct?
Vcc=3V, VT voltage range 1.3~2.2V SN74LVC2G14 is judged as High
Vcc=3V, VT voltage range 0.6~1.3V SN74LVC2G14 is judged as Low
If so, then the following questions arise. Please help to confirm the reply.
1. High level=1.3~2.2V, what is above 2.2V?
2. Low level=0.6~1.3V, what is below 0.6V?
3. To avoid misjudgment of SN74LVC2G14, VT should try to give a low signal below 0.6V or a high signal above 2.2V?
4. How high frequency noise can the VT of this component detect? 100MHz? 250MHz?

Eddie

  • 0
    Guru 293430 points

    In the worst case, the input voltage must be above 2.2 V to be judged as high.
    In the worst case, the input voltage must be below 0.6 V to be judged as low.
    When the voltage is between 0.6 V and 2.2 V, the input state is not guaranteed.

    There is no guaranteed minimum input pulse width. If you want to ignore high-frequency noise, add a low-pass filter.

  • 0 in reply to Clemens Ladisch
    TI__Intellectual 1110 points

    Hi Ladisch and Team,

    One question you loss is How high frequency noise can the VT of this component detect? 100MHz? 250MHz?

    Eddie

  • 0 in reply to Chao Fu Chen
    TI__Mastermind 21170 points

    Hi,

    What do you mean by that question? The part can operate at a minimum frequency of ~180MHz at 3.3V VCC. I'm not sure what is meant by the voltage threshold detecting noise.

    Best,

    Malcolm

  • 0 in reply to Malcolm Lyn
    Guru 293430 points

    LVC can do at least 175 MHz in the worst case. The highest frequency it can actually detect in the 'best' case is much higher.

    In practice, you add a low-pass filter that removes all frequencies higher than those of your signals.