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AM26LV31: Do we have any Quadruple Differential Line Driver with internal pull up(down) Resistor in input side?

Moon Wang
Intellectual 1285 points
Part Number: AM26LV31
Other Parts Discussed in Thread: SN65LBC172A, SN75LBC172, SN65LBC174, AM26LS31, SN75172, SN75ALS192, MC3487, SN75LBC172A

hello team,

Do we have any Quadruple Differential Line Driver with internal pull up(down) Resistor in input side?

BR,

Moon

  • +1
    Guru 317260 points

    LBC devices ( SN75LBC172, SN65LBC174(A), SN65LBC172A) have internal pull-ups.

    And there are old, bipolar devices (AM26LS31, SN75ALS192/4, MC3487, SN75172/4) whose inputs behave as if high when open.

    All of them require a 5 V supply.

  • +1
    TI__Guru 52352 points

    Hi Moon,

    At a VCC = 3.3V supply we don't have any options that would fit that. The SN75LBC172A does have a integrated pull-up on the inputs and we guarantee its pulled up (some of the other devices Clemens mentioned most likely look to be pulled up but we don't actually have the guarantees really spec'd out either so they would be risky).

    Honestly if possible it will be easiest to have that resistor external to device as that is the best option if they want to use this specific device and typically the resistor can be small and cheap here so most applications really should be able to fit them in. You may not be looking as at nice of prices for the other IC options - you are looking at 5x to 10x the cost in a lot of the other IC options - which is way more expensive than an external resistor. 

    Best,

    Parker Dodson 

  • 0 in reply to Parker Dodson
    TI__Intellectual 1285 points

    Hello Parker，

    Many thanks for your reply. This demand is from my customer. They forgot the pull-ups on the input side of Differential Line Driver. So they want to use internal pull-up one for emergencies. I recommend that they should correct their PCB in next version.

  • 0 in reply to Moon Wang
    TI__Guru 52352 points

    Hi Moon,

    Thanks for the explanation of why - and please pass that message onto customer to hopefully avoid problems in the future. 


    Best,

    Parker Dodson