MPC5746R absolute maximum ratings for VDD_LV

cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 

MPC5746R absolute maximum ratings for VDD_LV

Jump to solution
259 Views
viktorfellinger
NXP Employee
NXP Employee

Dear support,

customer is working on MPC5746R VDD_LV supply implementation using external DCDC converter. 

In datasheet chapter "3 Absolute maximum ratings" there is a remark and its not clear what it really means :

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

4. 1.32 – 1.375 V range allowed periodically for supply with sinusoidal shape and average supply value below 1.275 V at
maximum TJ = 150 °C.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

Would it be possible to explain it and provide a timing diagram showing what is exactly specified by this note ? 

Best Regards,

Viktor

0 Kudos
1 Solution
219 Views
petervlna
NXP TechSupport
NXP TechSupport

Hello Viktor,

Here is the feedback from design:

The notes specify what are the allowable VDD_LV conditions beyond the spec MaxVDD at 1.32V

petervlna_0-1701416440834.png

 

Here it says what you are allowed to have for each range. From 1.32 – 1.375V, you can have some sine wave type of level, but must average out to be 1.275V. Like you can swing from 1.2 to 1.375V with Vrms of 1.275V.

petervlna_1-1701416455168.png

 

Then between 1.375 – 1.45V, not more than 10 hours of it. Lastly between 1.45-1.5V (max rating), can only do 60s.

Best regards,

Peter

View solution in original post

0 Kudos
2 Replies
239 Views
petervlna
NXP TechSupport
NXP TechSupport

Hello Viktor,

This questions was passed to designer.

Once I have clear answer, I will post it here or contact you directly.

Best regards,

Peter

0 Kudos
220 Views
petervlna
NXP TechSupport
NXP TechSupport

Hello Viktor,

Here is the feedback from design:

The notes specify what are the allowable VDD_LV conditions beyond the spec MaxVDD at 1.32V

petervlna_0-1701416440834.png

 

Here it says what you are allowed to have for each range. From 1.32 – 1.375V, you can have some sine wave type of level, but must average out to be 1.275V. Like you can swing from 1.2 to 1.375V with Vrms of 1.275V.

petervlna_1-1701416455168.png

 

Then between 1.375 – 1.45V, not more than 10 hours of it. Lastly between 1.45-1.5V (max rating), can only do 60s.

Best regards,

Peter

0 Kudos