1. General description
CBTL04DP211 is an (Embedded) DisplayPort multiplexer for DisplayPort v1.1a switching
and multiplexing applications on PC platforms. It is capable of 1 : 2 switching or
2 : 1 multiplexing of 2-lane DisplayPort Main Link signals, using high-bandwidth pass-gate
technology. Also, it can switch/multiplex Hot Plug Detect (HPD) signal and AUX signals,
for a total of four channels on the display side.
To facilitate DisplayPort switching/multiplexing scheme on PC platforms suitably,
CBTL04DP211 provides two separate selection pins (GPU_SEL, AUX_SEL). The
selection pin GPU_SEL performs switching from one Main Link to another Main Link. HPD
signals will also be switched using the same selection pin. A separate select pin
(AUX_SEL) provides additional selection between two AUX channels such that the AUX
channel selection is independent of the Main Link and HPD signal selection.
A typical application of CBTL04DP211 is on motherboards where one of two GPU/CPU
display sources needs to be selected to connect to a DisplayPort sink device or connector.
A controller chip selects which path to use by setting a select signal HIGH or LOW. Due to
the non-directional nature of the signal paths (which use high-bandwidth pass-gate
technology), the CBTL04DP211 can also be used in the reverse topology, e.g., to connect
one DisplayPort source device to one of two DisplayPort sink devices or connectors.
2. Features and benefits
Supports DisplayPort v1.1a: 1.62 Gbit/s, 2.7 Gbit/s
Supports Embedded DisplayPort v1.2: 1.62 Gbit/s, 2.7 Gbit/s
Supports 1-lane, 2-lane Main Link operation
1 : 2 switching or 2 : 1 multiplexing of DisplayPort Main Link signals
2 high-speed differential channels with 2 : 1 multiplexing/switching for DisplayPort
Main Link signals
1 channel with 2 : 1 multiplexing/switching for AUX signals
1 channel with 2 : 1 multiplexing/switching for single-ended HPD signals
High-bandwidth analog pass-gate technology
Very low intra-pair differential skew (5 ps typical)
Very low inter-pair skew (< 180 ps)
Switch/multiplexer position select CMOS input
Single 3.3 V power supply
Very low operation current of 0.2 mA typical
ESD 8 kV HBM, 1 kV CDM
ESD 2 kV HBM, 500 V CDM for control pins
Available in 3 mm × 6 mm, 0.4 mm pitch HVQFN32 package
CBTL04DP211
DisplayPort 2 : 1 multiplexer
Rev. 2 — 13 April 2012 Product data sheet
