TPS3890: RESET pull-up resistor value - Datasheet contradiction

franziskus

Expert 8249 points

Part Number: TPS3890

Team,

the minimum value for the pull-up resistor is stated to be 1 kOhm in chapter 7.3 and 10 kOhm in chapter 6.

Can you clarify the correct minimum value?
My customer wants to use 4.7 kOhm resistor.

Thanks

over 5 years ago

0 Abhinav.Sharma over 5 years ago

TI__Genius 9375 points

Hi Franziskus,

The minimum value should be as mentioned in the electrical characteristics table (1k), but we do not usually recommend operating near the minimum or maximum, so you should probably use at least 10k here. Either way, I believe 4.7kOhm will work fine, but 10k or 100k would be better.

Thanks,
Abhinav.

0 franziskus over 5 years ago in reply to Abhinav.Sharma

TI__Expert 8249 points

Hi Abhinav,

thanks for your prompt reply!

The typical application in the datasheet uses a 1 MOhm resistor, so it is set to the upper limit.
As I understand, you can confirm that the minimum value is 1kOhm, but we recommend a value between 10k and 100k.

However, the 4.7k that my customer chose should be fine and is within spec limits.

Can you confirm my understanding?

Thanks!

0 Abhinav.Sharma over 5 years ago in reply to franziskus

TI__Genius 9375 points

Franziskus,

Yes this should be fine!

Thanks,

Abhinav.

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TPS3890: RESET pull-up resistor value - Datasheet contradiction