JAJSU29 March 2024 ISOUSB211-Q1
ADVANCE INFORMATION
Decoupling capacitors are placed next to ISOUSB211-Q1 according to the recommendations provided in the Power Supply Recommendations section. Note that the USB standard requires that, for a peripheral, the total capacitor value on VBUS, including any decoupling capacitors reflected from the secondary side through the isolated DC-DC converter, must be less than 10-μF. However, a total of at least 5-µF capacitance is recommended on VBUS. A 100-nF capacitor is recommended close to the VBUS connector to handle tranisent currents.
ESD diodes with low capacitance and low dynamic resistance, such as PESD5V0C1USF, may be placed on D+ and D- lines. A ferrite bead, with dc resistance less than 100 mΩ, may be optionally placed between VBUS pin of the connector and the VBUS pin of ISOUSB211-Q1, as shown in the figure, to suppress transients such as ESD.