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.

ISO3088: RS 485 REPEATER DESIGN NOT WORKING AT 115200 BAUD RATE.

Part Number: ISO3088

Dear Sir,

   I am using one reference design from Texas for RS485 repeater half duplex using ISO 3082 transreceiver. This circuit is designed for data rates upto 200 kbps. I am working on the repeater design for higher speed of 1.5 Mbps (115200 baud rate). For this i have replaced the ISO 3082 transreceiver with higher data rate ISO 3088 transreceiver. In this case the circuit is not working with the component  parameters same as for ISO 3082. For high speed i think the switching components for the schmitt trigger needs to be changed. But exactly what values i am not at all clear. Because of the switching accuracy not attained in my case i am not able to get the output from the first transreceiver also.

  Kindly provide the details for the switching circuit and their components values that need to be matched exactly for working with ISO 3088 transreceiver instead of ISO 3082 transreceiver in the existing design. Its link is .

Please guide.

  • Hi Aakash,

    Thank you for reaching out to us again. I remember you had created a post (link below) earlier with similar title, can we please continue our discussion on the same post so that the complete discussion or debug is in one place?

    Please do note that the RS-485 repeater design is sophisticated and only by replacing a lower speed device with a higher speed one might not get you the required datarate, other components in the circuit may also need to be adjusted accordingly.

    The schematic you have attached is a reference design schematic, could you please share you schematic in the other E2E post? Even small things overlooked could create issues and hence I recommend to review your schematic. Once you share the schematic, Lucas or one of us will take a look into it and accordingly comment. Thanks.

    Regards,
    Koteshwar Rao