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SN74ALVC164245　Power-down protection 　on inputs and outputs

Masa_0000
Intellectual 885 points
Other Parts Discussed in Thread: SN74ALVC164245

Hi　Everybody!

I need an information of SN74ALVC164245.
In case of VCCA and VCCB Power-down　then prevent the "input signal sink current "and "output sink current "?

-Would SN74ALVC164245 have "Power-down protect function" 　on inputs and outputs ? (like a Ioff or partial Power-Down function)

-Would SN74ALVC164245 have the "input tolerant " and "output tolerant" function?

Please let me know if you have any information.

Best Regards

shing

  • 0
    Guru 316690 points

    If it had these features, the datasheet would proudly and loudly say so.

    However, what it actually says is that it needs a pull-up on OE to protect the I/Os during power down, and, in the Absolute Maximum Ratings, that the input signals at the I/O ports must not be much higher than the respective VCC.

  • 0 in reply to Clemens Ladisch
    TI__Guru 62050 points
    Shing ,

    Unfortunately , the device does not have the Ioff feature listed on the datasheet .
    The I/O of A and B ports have ESD diode to VccA and VccB respectively .So , it is not recommended to have voltages greater than Vcc on any of the I/O ports .
    Also , the inputs DIR and OE doesn't have positive ESD diodes to Vcc , so technically you can apply voltages higher than Vcc however it is not recommended.