TUSB322I: Working temperature

Wendy:

   We don't provide Tj since it depends on real system. but you can estimate based on the methold from  document SPRA953C at ti.com.

If you can control Tj , then it should be ok.

Best

Brian

What's the max value of Tj requirement for TUSB322I to compare with the calculate the Tj.

Power is 0.35mW , RθJA=169.3°C/W  Tj=85 +170x0.35/1000=85.06°C . 

in 95℃ ambient temperature Tj = 95+0.35*170/1000 = 95.06°C，  what's the max Tj requirement in 95℃ ambient temperature ?

In my case, in 95℃ high ambient temperature,  USB port is always
unconnected, TUSB322 is  in unattached mode or even can been pulled down to reset state. Can TUSB322 work fine and Tj  be kept in safe range in my case?

If  the max Tj requirement is 91 ℃，calculated TJ 95.6℃ is not acceptable, what's bad results will be caused to TUSB322 working in 95℃ ambient temperature?

at what temperature it start failing?

Best

brian

The board is under design, not ready for test. We want to select USB PHY TUSB322 but the working temperature is a concern.  Could you help to find the max Tj requirement  of TUSB322 to make sure it work fine in high temperature.  Then we can see if  there is a chance that we can try to keep Tj in the required range  in 95 ℃ working temperature in future test.  

ok, let me confirm.

Best

Brian

ma Tj is 105C.

Best

Brian

So the Tj range is -40~105℃？ Whether TUSB322I can working normally for a long time when Tj = 105 ℃  or it can only withstand several seconds with 105 ℃ Tj?

TUSB322 VDD is 5V and datasheet said the open drain INT_N pin should be pulled up to VDD. But SOC receive INT_N pin is 3.3V/1.8V GPIO . Could the INT_N pin be pulled up to 3.3V/1.8V ?

INT_N can be pulled up to any external voltage. But e suggest to PULL up to VDD to avoid current drive back hen VDD is off but INT_N is still high.

Best

Brian