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TS3A4751: Power off application

David Huang
Intellectual 2285 points
Part Number: TS3A4751
Other Parts Discussed in Thread: TMUX1112, TMUX1511

Hi team

My customer is looking for a switch and is checking on TS3A4751 and TMUX1112.

In their application, the switch has to be placed on 1 board and the output device needs to placed on another board as below.

Could you check if this application is fine regarding the output maximum rating? (Datasheet says Vdd+0.3V so it's over the recommended value)

Regards

  • 0
    TI__Expert 3515 points

    Hi David,

    From the picture, the Vdd divide line shows that the mux will be powered off with the COM1 line pulled high to either 3.3V or 2.5V. This type configuration requires a mux with the powered off protection feature because muxes without this feature risk damage when voltage is present on the I/O pins and the device is powered off. Here is a TI Precision labs video that gives further explanation on this topic: Simplify power sequencing with powered-off protection

    An alternative device with powered off protection in the 1:1, 4 channel configuration is the TMUX1511.

    Thanks,
    Tyler