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ADuM3160: any problem with VBUS2 being 3.3 V?

Category: Datasheet/Specs
Product Number: ADuM3160

The ADuM3160 datasheet is somewhat ambiguous about whether or not VBUS2 can be supplied from 3.3 V.  The specifications in Table 1 refer to both VBUS1 and VBUS2 having a range of 4.5 to 5.5 V, but Figure 5 shows VBUS2 tied to VDD2, which is then tied to 3.3 V.  Can VBUS2 be 3.3 V comfortably?