Transition time of i.MX6DQ POR_B.

[satoshishimoda]

Hi community,

Our customer have a question about i.MX6DQ POR.

They want to know the spec of rise time to i.MX6DQ POR_B input signal.

First, in foot note 3 of Table 22 in datasheet (IMX6DQCEC Rev.4).

It says  Monotonic input transition time is from 0.1 ns to 1 s.

And second, in Table 27 "Input Transition Times, trm, max 25ns".

Which spec is applied to POR_B?

Actually, our customer found the transition time of the reset signal from MMPF0100 is 0.2ms (tR4 in Table 11 MMPF0100 datasheet).

If "max 25 ns" is applied to POR_B, we worry MMPF0100 reset signal cannot satisfy the spec.

Best Regards,

Satoshi Shimoda

[Yuri · Accepted solution]

Hello,

  Strictly speaking, i.MX6 POR rising / failing timings are not specified,

and this means - there is no rise time requirement for POR.

GPIO parameters in the Datasheet should not be applied to open drain

POR signals.

Have a great day,
Yuri

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

[satoshishimoda]

Dear Yuri,

Thank you for you reply.

According to your reply, I understood MMPF0100 RESETBMCU rise time is no problem for i.MX6DQ POR_B input.

Thank you for your great support.

Best Regards,

Satoshi Shimoda

[Yuri]

Yes, MMPF0100 RESETBMCU rise time is no problem for i.MX6DQ POR_B input.

~Yuri.