1FEATURES
• Ideal for DockPort Applications
– Bi-Directional 2:1 Switch for USB 2.0
(HS/FS/LS) and HPD Signals
– Bi-Directional 2:1 Switch for SuperSpeed
USB and DisplayPort Signals
– Integrated DockPort Controller Manages
DockPort Detection, Signal Switching and
Power Switching
• Supports Host-and Dock-side Applications
• VCC Operating Range 3.3V ± 10%
• SuperSpeed USB I/O Supports Common Mode
Voltage from 0V to 2.2V
• USB 2.0 I/O Supports Signal Up to 3.6V
• Wide –3dB Differential BW on High-bandwidth
Path of over 6 GHz
• Excellent High-bandwidth Path Dynamic
Characteristics on (at 2.5GHz)
– Crosstalk = –39dB
– Isolation = –22dB
– Insertion Loss = –1.2dB
– Return Loss = 12 dB
– Max Bit-Bit Skew = 8 ps
• 5mm x11mm, 56-Pin WQFN Package (RHU)
• ESD
– HBM: 2000V
– CDM: 500V

APPLICATIONS
• Desktop PCs
• Notebook PCs
• Tablets
• Docking Station

DESCRIPTION
The HD3SS2521 is an integrated DockPort switch solution. It provides independent 2:1 passive switching for the
SuperSpeed USB and Display Port signals as well as for the USB 2.0 (HS/FS/LS) and I2C necessary to support
DockPort applications. In addition, a firmware upgradable integrated DockPort controller is provided to manage
host and dock side DockPort detection, signal switch and power configuration.
The HD3SS2521 is offered in 56-pin WQFN package and is specified to operate from a single supply voltage of
3.3V over the temperature range of 0°C to 70°C .