My customer is considering SN65HVD256 and has a question.
I would be grateful if you could advise.
The undervoltage detection level (UVvcc: Undervoltage detection on VCC for VCC protected mode) described in the data sheet P.6 is specified as 3.5 to 4.45V.
Will UVLO be activated if the voltage drops even momentarily below the voltage value during this period?
Or do you have a rule or guideline for the detection time?
Also, please let us know the UVvcc threshold voltage deviation.
Regarding 9.3.4 Undervoltage Lockout on page 16 of the data sheet
It states "After an undervoltage condition is cleared and the supplies have returned to valid levels, the device typically resumes normal operation in 300 μs."
What is the condition for "typically resumes normal operation" here?
Will 300us always be the recovery time even for a momentary spike-like voltage drop?
Also, does the UVLO detection threshold voltage change depending on the degree of VCC voltage drop?
VCC momentarily (up to 100 µs) to 4.45 V depending on usage conditions may fall below.
On the other hand, Vrxd=3.3V is a constant condition.
According to Table 3 of the datasheet, this power supply condition is a UVLO activation condition, so the output may become High Impedance.
However, it was not observed.
Is it because the threshold voltage of the device is below 4.45V or back to normal without recovery time(300us) ?
I appreciate your great help in advance.