SN75DP139: lower resistance value on VSADJ

dimitry chen

Part Number: SN75DP139

Tool/software:

The datasheet specifies a 4.02kΩ resistor. In our testing, we found that　ｍｕｓｔ using a 3kΩ resistorpass our signal integrity (SI) tests.

We'd like to understand the potential risks of using a lower resistance value that our tests might not be capturing.

1 day ago

0 David (ASIC) Liu 1 day ago

TI__Guru**** 177301 points

Hi,

The lowest VSADJ resistance we characterized is 3.5kohm, we can't guarantee device operation if it is below 3.5kohm.

Thanks

David

0 dimitry chen 1 day ago in reply to David (ASIC) Liu

Expert 1145 points

Could you please elaborate on the specific risks of using a lower resistance value, particularly concerning interoperability, EMI performance, and long-term reliability?

0 David (ASIC) Liu 18 hours ago in reply to dimitry chen

TI__Guru**** 177301 points

Hi,

I honestly don't know since we never characterized the VSADJ resistance below the 3.5K.

Thanks

David

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SN75DP139: lower resistance value on VSADJ