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[ DS90UB925 ] Serializer Lock Time

Kenichiro
Mastermind 9165 points


[ DS90UB925 ] Serializer Lock Time

Hi,
The Fig. 10 in the datasheet indicates that PDB is cleared  with PCLK applied.
However, even without having PCLK, PDB pin still can be cleared.
As my understanding, in this condition, device detects "Loss of PCLK", then goes into SLEEP mode, correct?
On top of that, is t_PLD specification still valid for the recovery time from SLEEP state?
Also, during this recovery time ("Lock Time"  is valid term, may be), data outputs, DOUT+/- are disabled and nothing appeared on serial output. Please correct me, if I'm wrong.
MODIFIED
In addition, is there any limitation when PDB is enabled?
And how much delays  can be expected from enable PDB to disappearance of output data?
Thanks,
Ken
  • 0
    TI__Genius 14015 points

    Hi Ken,

    There isn't actually a sleep mode, it's more of a standby mode where the 925 is waiting for a valid PCLK. The internal oscillator will be used to maintain communication with the deserializer in this state. t_PLD is the time from 'sleep' or standby to the output being driven.

    During the time while the 925 is trying to lock to the PCLK, the outputs will be disabled.

    I'm not sure what you mean by limitation when PDB is enabled. Can you elaborate?

    The delay from PDB going low to the output being disabled is on the order of 10-20ns.

    Thanks,
    Jason

  • 0 in reply to Jason Blackman
    Mastermind 9165 points

    Hi Jason,

    Thank you for your support and sorry that my reply being late.

    "limitation", mean that, I just wondered whether any of conditions (timing, input signal appearance etc) should be taken when PDB is enabled. From your reply, I understood that PDB can be enabled anytime it's necessary.

    Thank you for your support!
    Regards,
    Ken