Because of the Thanksgiving holiday in the U.S., TI E2E™ design support forum responses may be delayed from November 25 through December 2. Thank you for your patience.

  • State Resolved
  • Replies 2 replies
  • Subscribers 32 subscribers
  • Views 29 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

TRS3232E: can the TRS3232E be power via the RS232 lines

Laurent FACCHINETTI
Prodigy 60 points
Part Number: TRS3232E

Tool/software:

Hi,

I have seen this in the past from some of the RS232 transceivers in the market but, can the chip be powered when there is a +10V on the RS232 lines, while the chip is supposed to be OFF ?

Is current leakage from RS232 lines to the component Vcc possible  ?

Thanks.

Best regards.

  • +1
    TI__Guru 58530 points

    Hi Laurent,

    The abs max voltages for the RS232 pins are 25V for the receiver pins (Rin) and 13.2V for the driver pins (Dout). So the device should be able to withstand the 10V even when the transceiver isn't powered.

    For leakage current, we technically only spec our leakage current electrical parameter when the device is powered up. So this means we don't guarantee the device's leakage when it's unpowered. I believe our newer devices don't have an issue with leakage when Vcc is unpowered though. It looks like this device was redesigned in 2021 so the devices you buy should have the newer designed dies in them. I would still recommend double checking this in your system.

    -Bobby