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Unexpected low resistance on pin 6 of TS3USB3031 (USB 2.0 1:3 SP3T mux)

Other Parts Discussed in Thread: TS3USB3031

Customer uses TS3USB3031 on a project but finds lots of failure on Pin 6, which will show a low resistance on their board(less than 100ohm), but if they pull high this pin to 3.3V, the resistance will become to about 7Kohm+