This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS3808-EP: CT values

Part Number: TPS3808-EP
Other Parts Discussed in Thread: TPS3808

Team, 

My customer has the following question:

I am currently using the TPS3808-EP( Low Quiescent Current, Programmable Delay Supervisory Circuit) in 

one of our designs here to control the relative delay time between two different Reset signals.

Under worst case conditions, I am trying to make sure the right CT(external capacitor that sets the Reset delay time) capacitors are chosen to maintain adequate delays between the 2 signals to meet design timing specifications.

 

The problem is for given CT capacitor values the datasheet specifies a very large (50% to 75%) delay range in the 6.6 Switching Characteristics table, etc.  over the operating temperature range ( (TJ = –55°C to +125°C), which seems to contradict the following plots in the datasheet:

 

Figure 3. RESET Timeout Period vs CT

Figure 4. Normalized RESET Timeout Period vs Temperature

 

Can you tell me the reasoning behind the wide range for the Reset Time delay over temperature in

section 6.6 Switching Characteristics of the datasheet ?  Can you clarify this for me?

Regards,

Aaron