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SN74AVC2T45: VCC under 1.2V

Cedrick
Expert 8270 points
Part Number: SN74AVC2T45
Other Parts Discussed in Thread: SN74AXC2T45

Hi,

Greetings!

Our customer has a design around SN74AVC2T45 that is translating from 1.2V IO to 3.3V IO and they noticed something in the datasheet that concerned them. The datasheet doesn’t specify any tolerance on the VCC when connected to 1.2V rail.  It says 1.2V is the minimum. Their concern is with respect to the PSU being slightly under. Is there a tolerance?  They said, normally their 1.2V rail should be very close to 1.2 but it could be slightly under.

Can you please help us with this matter? Thank you.

Regards,
Cedrick

  • 0
    Guru 287760 points

    Voltage ranges are indeed sized so that there is enough tolerance (e.g., the maximum is 3.3 V plus about 10 %).

    With the minimum specified as 1.2 V, the device is not guaranteed to work at any voltage below that, even if it is 1.19 V. (In practice, the device will probably work, but might exceed the electrical and switching characteristics. But there is no guarantee.) So, strictly speaking, 1.2 V ± some tolerance is indeed not a valid supply voltage.

    I'd recommend raising the supply slightly, or using the SN74AXC2T45 (when it's available).

  • 0 in reply to Clemens Ladisch
    TI__Expert 8270 points

    Hi Clemens, 

    Thank you for your answer and recommendation. I really appreciate it.

    Have a great day.

    -Cedrick


  • 0 in reply to Cedrick
    TI__Expert 8270 points

    On the other hand, I would like to hear what our apps engineer have to say on this matter. I would appreciate your response. Thanks.

  • 0 in reply to Cedrick
    TI__Genius 16725 points

    Hi Cedrick,

    I agree with clemen's response. We cannot guarantee any of the specs in the datasheet under the recommended operating range. The device should still operate slightly under the recommended range, however I would be very careful about this and best practice would be to raise the supply voltage. 

    The AXC2T45 would be the best replacement when it released. It will be a pin to pin replacement with a larger supply range. I do not know the timeline on when it is being released.

    Thanks!

    -Karan