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DS90CF386: pull-down resistance

Yusuke Mukuno

Expert 7395 points

Part Number: DS90CF386

Hi Bryan-san

It is related question from below,

I could not get your answer for #2.

Could you please give me your comment for the #2?

2. According to the specifications "7.1 Overview", the following is stated, so if you set / PWRDWN to Low, customer understand that it is okay even if there is no valid data input.
"These devices feature a PWR DWN pin to put the device into low power mode when there is no active input data."
At this time, RxOUT0 ~ 27 seem to be Low, what is the value of pull-down resistance ?

Thanks

Muk

over 5 years ago

0 Bryan Kahler over 5 years ago

TI__Mastermind 25955 points

Hi Muk,

Thank you for reaching out. Will look into the internal pull down resistance of this pin. Please expect an update on Wednesday.

Sincerely,
Bryan Kahler

0 Yusuke Mukuno over 5 years ago in reply to Bryan Kahler

TI__Expert 7395 points

Hi Bryan-san,

Do you have any update?

Muk

0 Bryan Kahler over 5 years ago in reply to Yusuke Mukuno

TI__Mastermind 25955 points

Hi Muk,

Please refer to the response above.

Sincerely,
Bryan Kahler

0 Bryan Kahler over 5 years ago in reply to Bryan Kahler

TI__Mastermind 25955 points

Hi Muk,

Typically, there aren't pull-up/down resistors on outputs as they are mainly applied to input or input/output pins.

The DS90CF386 may be placed into a power down mode by asserting _PWR_DWN_ (active low).

As for why RxOut0, pin 27 may be low:

The data outputs (RxOUT) retain the states they were in when the clocks are stopped.

For more information, please refer to section 7.4.1 of the datasheet.

Sincerely,
Bryan Kahler.

0 Yusuke Mukuno over 5 years ago in reply to Bryan Kahler

TI__Expert 7395 points

Hi Bryan-san,

Thank you for your answer. I appreciate your support!

Muk