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RE: SN74LVT16244B slew rate

Mike Wang2
Intellectual 2760 points
Other Parts Discussed in Thread: SN74LVC2T45, TXB0102, TXS0102Hi Shreyas,

My customer used SN74LVC2T45 as level shift in their system. However, they met the same problem as the input slew rate is too small and output start to ringing. they've tried smaller pull up resistor, but still can't meet the requirement. they need the device to do the level shift and the signal is bidirectional. (3.3V and 5V, 2 bits, controlled bidirectional). could you please advice if there's any device can meet the requirement? or any work around to solve the problem? thanks.

I'm also thinking about adding a buffer with schmitt trigger before the level shift, but buffers are all single direction.

BR,
Mike
  • 0
    TI__Guru 56950 points
    Hi Mike ,

    I have moved your post into voltage translation forum for support .
  • 0
    TI__Expert 6335 points
    Mike,

    The only other devices that support (a) bi-directional, (2) 3.3V to 5.0V, and (c) 2 bits are: TXS0102 and TXB0102

    Regarding the output ringing being observed by the customer:

    1. What is the signal data rate?
    2. What is the application?
    3. What is the value of the original pullup resistor? What is the value of the new pullup resistor?
    4. Can the customer send me the oscilloscope plots of the output ringing with (a) the original pullup resistor, and (b) with the new pullup resistor?
    5. Does the customer have an oscilloscope plot of the input signal, along with its measure slew rate (or rise time)?

    Regards,
    Nirav