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TLV3501: Open-drain version of TLV3501

Zach Kimble
Intellectual 1385 points
Part Number: TLV3501
Other Parts Discussed in Thread: LM119, , TLV9020, LMV7235, LM319-N, TXU0101, SN74LXC1T45, SN74LVC1G07

Hello,

Does TI sell a device similar to TLV3501 with an open drain output instead of push-pull? I do not see any comparators on TI.com with open drain output and less than 75ns of propagation delay (except LM119, but military grade would be overkill for my application).

Thank you!

Best regards,

Zach Kimble

  • +1
    TI__Guru 54606 points

    Hi Zach,

    When you get into the <100ns response range, the comparators will have push-pull outputs for symmetry as an open collector would have to have very low value pull-up to get the equivalent edge (risetime) rates. Higher speed devices also tend to be low voltage (5V).

    What is your supply voltage? What is the application?

    There is the TLV9020/1/2/4, which is close at 100ns and can probably get to 75ns if driven hard enough. See the propagation delay graphs in the rear of the datasheet (page 17).

    There is also the LMV7235, which is an older device, but at 75ns is about in your wheelhouse.

    The  LM319-N are the non-military versions of the LM119 - if you still want to pursue the older LMx19 high voltage family (> 5V supply - but watch input range).

    We'll reach out to you internally.

  • 0 in reply to Paul Grohe
    TI__Intellectual 1385 points

    Hi Paul,

    Thank you for your response! This makes sense, the passive RC circuit that pulls the voltage up to the maximum would need quite a low R to charge up that fast. 100ns will probably be acceptable but I will confirm. Assuming 100ns is okay, the devices you mention here seem to be a good fit.

    Thank you!

    Best regards,

    Zach Kimble

  • +1 in reply to Zach Kimble
    Guru 292630 points

    If the goal is to do level shifting, an actual level shifter (e.g., TXU0101, SN74LXC1T45) with a push/pull output would allow such speeds.

    But if you really need a fast open-drain output, you could add a strong open-drain buffer after the comparator. (The SN74LVC1G07 would allow a 150 Ω pull-up; the achievable speed depends on the capacitive load.)

  • 0 in reply to Clemens Ladisch
    TI__Intellectual 1385 points

    Thank you Clemens! This is very helpful.