SN74AVCH2T45: Does this device support the hot-plug of SFP+ module ?

Part Number: SN74AVCH2T45

Hi All

We intend to use SN74AVCH2T45 to translate the signal of SFP+ module(such as RX RATE , TX DISABLE) from 1.8V to 3.3V , and the 3.3V side will be connected to the SFP+ . 

So , does the hot-plug of SFP+ module can cause damage to SN74AVCH2T45 ?  P.S. VCC of SN74AVCH2T45 will not power down in the whole process.

Hope for your reply

Thank you

该设备是否支持SFP+模块的热插拔

2 Replies

  • Hello, and welcome to the forums!

    The question of "will hot-plugging damage this device" is really a question of "what is going to happen when hot-plugging occurs?"

    I can't answer that second question easily without knowing a great deal about your system. For example, do you expect to get ESD strikes on the connector? (ie will people be touching the connector?) If so, there's a high chance of damage to the logic device.

    Is your system designed to connect ground FIRST, the VCC, and _finally_ digital I/O lines?
    What will the voltage be on any one I/O line when the connection is made?
    Assuming a line starts at the wrong voltage, we can expect there to be a transient where the SN74AVCH2T45 will have to charge the line capacitance -- thus we would need to know the load capacitance.

    If you can provide me details of what kind of signals the SN74AVCH2T45 will be subjected to, then I can give you an idea of its reliability in that situation. From the information given, I can't really help.


    Looking for a low voltage translator? Check out the AXC family that supports 0.7V to 3.3V translation!

    The Logic Minute training page has videos on many interesting topics that all are kept shorter than 5 minutes.

  • In reply to Emrys Maier:

    Thanks!

    I drew a diagram to indicate the relevant system . And the signals need to be translate are showed in the table from SFF-8431

    For your questions ,

    will people be touching the connector? --------- In the upper diagram , people will not touch the connector , but they will touch the module . But , the antistatic gloves are required

    Is your system designed to connect ground FIRST, the VCC, and _finally_ digital I/O lines? --------- Yes

    What will the voltage be on any one I/O line when the connection is made? -------- I did not get the point . Can the diagram above explain the problem?

    we would need to know the load capacitance --------  Sorry , I really don't know

    If your need more other info , please let me know

    Thank you!

    relevant