TMUX1072: Power Sequencing Confirmation

Matt Qi

Expert 4510 points

Part Number: TMUX1072

Tool/software:

Hi team,

My customer is wondering about the timing sequencing issue of TMUX1072.

The VCC is powered up by P3V3_STBY,

The pull-up power supply of the COM1/2, NC1/2, NO1/2 is P3V3_MAIN.

The P3V3_STBY should be powered up ealier.

The customer is considering whether there is a leakage path from VCC to the IO pins internally, so that the P3V3_STBY will influence P3V3_MAIN.

Could you please help check it?

Thanks a lot for your time and effort!

6 months ago

0 Clemens Ladisch 6 months ago

Guru 318050 points

There is no such leakage path.

0 Kameron Hill 6 months ago in reply to Clemens Ladisch

TI__Mastermind 24430 points

Hi Matt,

In addition to what Clemens said this device has a feature called power off protection that eliminates power sequencing concerns when the io pins are powered before the supply pin of the TMUX1072.

There is no path for the io pins to influence the supply pin when the io pins are powered before VCC

There should be no issues with the customer application but please let me know if you have any questions and I can explain more in detail

Regards,

Kameron

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TMUX1072: Power Sequencing Confirmation