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Original question:

SN74AUP1G125: signal speed question

SN74AXC4T774: max data rate question

Ryoma Ohashi
Intellectual 2580 points
Part Number: SN74AXC4T774

Hi team,

In the datasheet of SN74AXC4T774, it says

"The max data rate can be up to 310Mbps when device translates a signal from 1.8V to 3.3V"

Does this  "1.8V to 3.3V" means 

VCCA: 1.8V→VCCB: 3.3V

or 

VCCA/VCCB=1.8V～3.3V

Also, if VCCA=3.3V and VCCB=1.2V,

What would be the max data rate?


Regards,

Ohashi

  • +1
    TI__Mastermind 22085 points

    Hi Ohashi,

    Ryoma Ohashi said:

    Does this  "1.8V to 3.3V" means 

    VCCA: 1.8V→VCCB: 3.3V

    or 

    VCCA/VCCB=1.8V～3.3V

    It would mean VCCA or VCCB 1.8V to 3.3V up translation depending on the configuration as the device can up translate from VCCA (1.8V) to VCCB (3.3V) or VCCB (1.8V) to VCCA (3.3V).

    Ryoma Ohashi said:

    Also, if VCCA=3.3V and VCCB=1.2V,

    What would be the max data rate?

    I verified 1.2V<->3.3V translation for up to 240Mbps using the AXC EVM and would further recommend also verifying with the EVM per the system/loading requirements, thanks.

    Best Regards,

    Michael.