SNLS316G September 2009 – December 2015 DS90UR907Q-Q1
PRODUCTION DATA.
The VDD (VDDn and VDDIO) supply ramp should be faster than 1.5 ms with a monotonic rise. If slower than 1.5 ms, then a capacitor on the PDB pin is needed 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.
All inputs must not be driven until all supply voltages have reached their steady-state value.