PCA9511AD enable time at low temperature

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

PCA9511AD enable time at low temperature

473 Views
josebamartin
Contributor I

Hi,

I am using the PCA9511AD i2C buffer and I think that I have problems al low temperatures (-40ºC) when I enable it.

The datasheet only defines the typical enable time (Ten=110us) and says that at low temperatures (<-20ºC) this time can slow considerably for some parts, but does not specify any max. time.

Please, could you define the max. enable time at ambient temperature in the range from -40ºC to +85ºC?

Thanks in advance.

Joseba.

0 Kudos
2 Replies

426 Views
TomasVaverka
NXP TechSupport
NXP TechSupport

Hi Joseba,

This is a known issue and we screen for it at FT cold temp. Enable time does slow considerably at cold temp but varies greatly from part to part. We do not have any plans to spec the max for that reason.

Best regards,

Tomas

0 Kudos

426 Views
josebamartin
Contributor I

Hi Tomas,

If NXP does not have any plans to specify that max time I do not understand why this device is specified to be used at ambient temperature in the range from -40ºC to +85ºC.

We designed our board with the assumption of a Ten_max time of ten times the typical one (110us) and we see that this is not enough. What could be a good assumption? 20xTen_typ? 50xTen_typ? 100xTen_typ? ...?

Regards,

Joseba.

0 Kudos