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AM26LV31E - the signal switches using Analog switch or Bus-switch

Hirotaka Matsumoto
Guru 27585 points
Other Parts Discussed in Thread: AM26LV31E, TS5A21366

Hi all,

Would you mind if we ask AM26LVE31?

Please refer to the following attachment file.
20151224_AM26LV31E.pdf

If you have some comment, could you let us know?

Kind regards,

Hirotaka Matsumoto

  • 0
    TI__Guru**** 165396 points
    Hirotaka san,

    I will address this question today. The Christmas Holiday has delayed e2e responses.
  • 0
    TI__Guru**** 165396 points
    Hirotaka san,

    The bus switch will need a pull up resistor because only logic lows pass thorough the bus switch.
    Neither the AM26LV31E nor the switch (either choice) will accept connector inputs more than 300mV below ground.

    Why is this dual purpose needed?
    In transmit mode what is the data rate and is the cable terminated correctly?
    In receive mode what is the data rate and the cable length?

    The idea could work, but it depends on the application.
  • 0 in reply to Ron Michallick
    Guru 27585 points

    Ron san,

    Thank you for your very kind reply!
    And we apologize that we are late for the reply.

    Why is this dual purpose needed?
    ->We heard that our customer would like to reduce the connector.

    In transmit mode what is the data rate and is the cable terminated correctly?
    ->We don't know the data rate and the cable terminated. However, they use only two ways Hi-z or sending.

    In receive mode what is the data rate and the cable length?
    ->We don't know the data rate and the cable length.

    So, we ask our customer followings;

    -(In receive mode) the data rate and the cable length
    -(In transmit mode) the data rate and the cable terminated

    Kind regards,

    Hirotaka Matsumoto

  • 0 in reply to Hirotaka Matsumoto
    Guru 27585 points

    Ron san

    We are sorry that our explanation is not enough.
    In our customer schematic, they use only Pattern1 or Pattern2.
    (So, they don't switch from Pattern X to Pattern X in operation. Please refer to an attachment file.)
    20160106_AM26LV31E.pdf
    And then, we heard from our customer as followings;

    In transmit mode what is the data rate and is the cable terminated correctly?
    ->In tansmit mode(Pattern1),  AM26LV31E is enable,
       - the cable length : less than 1m
       - the data rate :  less than 32MHz, so minimum pulse width is 40ns, maximum pulse width is 2.5us.
       - the cable terminated : Of course, yes.
    So, in case of the cable length 1m, is it(AM26LV31E) possible to transmit the data with 40ns?

    In receive mode what is the data rate and the cable length?
    ->In receive mode(Pattern2), AM26LV31E is disable and Hi-z,
       - the cable length : less than 200mm～300mm
       - the data rate : JTAG signal(XXMHz)
       - Switch device : They will use TS5A21366

    Kind regards,

    Hirotaka Matsumoto

  • 0 in reply to Hirotaka Matsumoto
    Guru 27585 points

    Ron san,

    We are sorry to rush you.
    If you have some comment, could you let us know?

    Kind regards,

    Hirotaka Matsumoto

  • 0 in reply to Hirotaka Matsumoto
    TI__Mastermind 24985 points
    Hello Matsumoto-san,

    I apologize for the delay.
    Ron is currently out, but I will loop in the systems support for this device. Otherwise Ron should be able to get back to you by mid next week.

    Best,
    Michael
  • 0 in reply to Michael J Schultis
    TI__Guru**** 165396 points
    Matsumoto-san,

    It should work fine however the ESD performance will be limited by the analog switch.
    If you route the port to the AM26LV31E first and then to the analog switch (with no stubs), I expect the ESD performance to improve significantly.
  • 0 in reply to Ron Michallick
    Guru 27585 points

    Ron san

    Thank you for your reply during a busy time always!

    OK, we recommend that our customer should use ESD protection device.

    Kind regards,

    Hirotaka Matsumoto