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TXS0108E: Questions for Input transition Rise rate, Fall rate. Driver current

Yusuke Mukuno
Expert 7395 points
Part Number: TXS0108E
Other Parts Discussed in Thread: SN74AXC8T245,

Hi

Customer have some questions.

1. Could you please let me know about the reason of input transition rise rate and fall rate specifications (<10ns)?

    What are the concerns if the input waveform exceeds this value?

2. Output drive current.

   Could you please let me know about the output drive current value?

Muk

  • 0
    TI__Guru 61520 points

    Yusuke san,

    Please refer to the app note on the transition rate and its effects on the system.

    The TXS has limited output drive current, and is listed in the datasheet Voh and Vol electrical specs.

    Please let me know what is the application, spec requirements?

    Could you consider using the SN74AXC8T245?

    Let me know if you need any other help.

  • 0 in reply to ShreyasRao
    Prodigy 130 points

    Shreyas-san,
     
    Thank you for your answer.

    I checked TXS0108E datasheet Voh and Vol electrical specs,
    it is noted IOH is -20uA in VOHA/VOHB, IOL is 135/180/220/300/400uA in VOLA,
    and, IOL is 220/300/400/620uA in VOLB.
    Do you mean the MAX drive current is 620uA?

    And could you know the 'input' drive current spec of TXS0108E?

    Thank you.
    Yoshinori Kikui

  • 0 in reply to 菊井 良則
    TI__Guru 61520 points
    Yoshinori san,

    The max sink current is 620uA for the port B because of the higher voltage level support.
    The max sink current is lower for the port A since it supports up to 3.6V.

    The input current is defined only for the control input of the TXS listed as the Ii of 2uA.