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LSF0108: Open-drain vs Push-pull operation

user4975953
Prodigy 10 points


Hi Emrys,
The datasheet of LSF010x describes the switching characteristics in open-drain condition. I just wonder the switching characteristics and data rete of LSF010x in push-pull condition. Could it transfer the signal at 100MHz in push-pull condition? And how about the schematic of LSF010x in push-pull condition? Is it similar to the schematic of TXB010x?
  • 0
    TI__Guru* 97046 points

    Hi,

    I have split your question into a new post.  Please avoid adding on new questions to old threads - we are much more likely to see and answer your question if you post to a new thread.

    There is a great application report on the LSF family of translation devices available.

    The short answer to your question is 'yes, the LSF010x can translate a signal at 100MHz' -- however this is too simple, as there are specific conditions under which this is the case.

    In order to maximize speed with an LSF device, the higher voltage side trace capacitance must be kept to a minimum (5pF or less is recommended), and the driver's sink current must exceed 10mA (preferably more).

    Is it absolutely necessary in your application to use a bidirectional translator? At these speeds, I would usually recommend looking into either a direction controlled or unidirectional solution.