HD3SS3220 is a USB SuperSpeed (SS) 2:1 mux with DRP port controller. The device provides
Channel Configuration (CC) logic and 5V VCONN sourcing for ecosystems implementing USB Type-C. The
HD3SS3220 can be configured as a Downstream Facing Port (DFP), Upstream Facing Port (UFP) or a Dual
Role Port (DRP) making it ideal for any application.
The HD3SS3220, in DRP mode, alternates presenting itself as a DFP or UFP according to the
Type-C specifications. The CC logic block monitors the CC1 and CC2 pins for pull-up or pull-down
resistances to determine when a USB port has been attached and its port role. Once a USB port has
been attached, the CC logic also determines the orientation of the cable and configures the USB SS
mux accordingly. Finally, CC logic advertises or detects Type-C current mode – Default, Mid, or
High in DFP and UFP modes respectively.
Excellent dynamic characteristics of the integrated mux allow switching with minimum
attenuation to the SS signal eye diagram and very little added jitter. The device’s switch paths
deploy adaptive common mode voltage tracking resulting identical channel despite different common
mode voltage for RX and TX channels.
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