SNLS414E June 2012 – October 2016 DS90UR910-Q1
PRODUCTION DATA.
The VDD (VDDn and VDDIO) supply ramp must be faster than 1.5 ms with a monotonic rise. If slower than 1.5 ms, then a capacitor on the PDB pin is required to ensure PDB arrives after all the VDD have settled to the recommended operating voltage. When PDB pin is pulled to VDDIO, TI recommends using a 10-kΩ pullup and a >10-µF capacitor to GND to delay the PDB input signal.