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DS64BR401 Fail Safe Function

Sadanori Kato
Guru 36540 points
Other Parts Discussed in Thread: DS64BR401, DS100MB203

Hi,

We received some inquiries from my customers, have some questions.
When the device of DS64BR401 is powered off,
if we send CML signals to input terminals of IA_*+ and IA_*-(IB_*+ and IB_*-) ,
is this device destroyed?
In addition, if we send signals to other input terminals as well, is it destroyed?
If this device has fail-safe function, how is fail-safe performed?
Please tell me about this method as soon as possible.


Best Regards,
Kato

  • 0
    TI__Guru* 93670 points

    Kato-San,

    DS100MB203 has 100 Ohm differential internal termination on IA0+ and IA0-. The same is true for other inputs. When enabled there is a gated Vdd so there is 50 Ohm from IA0+ to Vdd and there is 50 Ohm from IA0- to Vdd. In normal power down mode, if you take your ohm meter, you would see 100 Ohm between IA0+ and IA0-. If you send a CML signal then there is 100 ohm termination. This can happen normally since it is possible that DS64BR401 may not be powered while the transmitter is powered up. In summary, the device is not damaged if it is powered off and there is active signals on the input pins.

    Regards,,nasser

  • 0 in reply to Nasser Mohammadi
    Guru 36540 points

    Hi, Nasser-san,

    Thank you for supporting.
    Because this device has a termination resistors, I understood that it is not problem.
    Thank you so much.

    Best Regards,
    Kato