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Can I use SN74AVC16T245 to transmit 110MHZ clock?

Jake Kim
Intellectual 680 points
Other Parts Discussed in Thread: SN74AVC16T245

Hi TIer

Is it possible to tranmit 110MHZ clock signal with SN74AVC16T245?

Additionally, what is the maximum speed of this device.

 

  • 0
    TI__Mastermind 30310 points

    Jake,

    I would probably not recommend using the SN74AVC16T245 for a signal with a clock of 100MHz.

    The recommended operating condition for input transition rise/fall time is 5ns/V. 

    If the VCCA side is operating at 1.2V, then a single CLK period should take at least 12ns, which correlates to only 83MHz.

    There are not many parts that have 16-bits available, but there are many 8-bit translation parts. Would you consider using 2 of these parts as a replacement for the SN74AVC16T245?

    What is the application? What is being applied to the A-port? B-Port?

    Thanks,

    Brian

  • 0 in reply to Brian Berner
    Intellectual 680 points

    Thank you for prompt answer.

    I need correct that you mentioned before.

    Actually Clock frequency is 110MHZ for using PCI-E.

    And, You might have a typo on recommendation part that is same part what I ask.

    Also I am going to share what you ask as below.

    1. Application : Tester for camera module.

    2. A side : 1.8V. B side : 3.3V

    Hope to see your answer.

     

  • 0 in reply to Jake Kim
    TI__Mastermind 30310 points

    Jake,

    I think you may have misunderstood:

    • I would NOT recommend the SN74AVC16T245 for this speed. It looks too slow
    • Also, all of the other 16 bit voltage translators are based on the same process with slight variations but would not have better speed performance
    This is why I ask if you can use 2 8-bit voltage translators instead of 1 16-bit translator. 
    Regards,
    Brian
  • 0 in reply to Brian Berner
    Intellectual 855 points

    Dear Brian.

    I have same questions.

    Plz let us know which devices you recommend to get the higher speed if I use 2 8-bit level translators.

    Thanks.

  • 0 in reply to avraka
    TI__Mastermind 30310 points

    Can you please tell me the VOH and VOL levels for the B-side port?

    i.e. what are the voltages for a logic high and logic low that will come from the PCI-e card operating at 3.3V? 

    As I understand it, PCI-e operates using a low voltage swing to signal high and low logic, referenced at a mid-rail voltage

    Our voltage translators may have difficulty translating for PCI-e due to a low voltage signal swing about a mid-rail reference voltage. For example, if the mid-rail is VREF, then Data+ may be only VREF+0.5V and Data- may be only VREF-0.5V which would mean our voltage translators would not see a low-to-high or high-to-low transition.

    Thanks,

    Brian