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Original question:

SN74CB3Q3245: Pin-to-pin skew

LMZ31506: LMZ31506, LMZ31710 Method of controlling the INH / UVLO pin

Masahito Takei
Intellectual 270 points
Part Number: LMZ31506
Other Parts Discussed in Thread: LMZ31710,

Can  INH / UVLO pins be used with 0V / + 3.3V active controls (CPLDs, power sequencers, etc.) instead of open drains?

In this case, a pull-down resistor (about 1k to 10kΩ) is connected to the signal line.
In addition, the control output is Hot-Socket support.

Please tell me about LMZ31710 as well.

In addition, the control output is Hot-Socket support.

  • 0
    TI__Mastermind 35115 points

    Hi ,

    Yes, these pins of both modules can be driven by a signal with an active push/pull capability. Open drain interface is not required.

    I'm not familiar with the term Hot-Socket. Could you give some more detail on this?

    Thanks,
    Anthony

  • 0 in reply to Anthony F
    Intellectual 270 points

    Thank you for your answer.

    Can you tell me the internal pull-up resistance (MIN, MAX) and internal pull-up voltage (MIN, MAX) of the INH / UVLO pins of the LMZ31506 and LMZ31710?

    Hot-Socket is explained on Intel's site. (The common name in US seems to be ”on-chip hot-socketing”)
    www.intel.com/.../hts-index.html

  • 0 in reply to Masahito Takei
    TI__Mastermind 35115 points

    Both of these devices have a current source on their INH pins. The current source value for each is about the same at ~1uA when below the threshold and ~3uA when above the thresholds. The exact value is in the devices spec table.

    The internal current sources will bring the INH pin up to ~3.0V. It is ok to drive the pin above this internal voltage.

    Thanks for sharing the link. That was my guess as to the meaning of Hot-Socket but wanted to be sure. Until now I have only heard the terms hot swap or hot plug. Which pins will be seeing a hot plug? The key thing I would say to look out for when doing this is to check and make sure none of the pins' voltages exceed the ratings.

  • 0 in reply to Anthony F
    Intellectual 270 points

    Thank you for telling me the notes.
    I have confirmed that the voltage does not exceed the rating.

    Regards