• State TI Thinks Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 2 answers
  • Subscribers 34 subscribers
  • Views 437 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

MAX3243: RS232 without -12V power

Ann_Lien
Genius 14410 points
Part Number: MAX3243
Other Parts Discussed in Thread: SN75C185, TRS3243E

Hello expert,

Do we have COM port level shifter IC doesn't need -12V power? Customer is using MAX3243 before but -12V will no longer being used in their system, they would like to find another solution without -12V power requirement. Thanks a lot!

Best regards,

Ann Lien

  • 0
    Guru 316690 points

    A plain transceiver like the SN75C185 would require ±12 V supplies. But the MAX3243/TRS3243E uses charge pumps to generate the output voltages from a 3.3 V or 5 V supply. If the customer is using the MAX3243, then −12 V has never been necessary.

  • 0
    TI__Guru 52172 points

    Hi Ann,

    Clemens is correct - the MAX3243 uses a 3.3V to 5V supply range for voltage supplies and uses internal charge pumps to generate the required RS-232 bus voltages. 

    Customer doesn't need a -12V in the system to use this device.

    Please let me know if there are any other questions!

    Best,

    Parker Dodson