CBTL03SB212 Datasheet, PDF (1/16 Pages) NXP Semiconductors – DisplayPort Gen2 sideband signal multiplexer

CBTL03SB212
DisplayPort Gen2 sideband signal multiplexer
Rev. 1 — 21 February 2011
Product data sheet
1. General description
The CBTL03SB212 is a sideband signal multiplexer for DisplayPort Gen2 applications. It
provides one differential channel capable of switching or multiplexing (bidirectional and
AC-coupled) DisplayPort 1.2 Fast AUX or AUX signal, using high-bandwidth pass-gate
technology. Additionally, it provides for switching/multiplexing of the Hot Plug Detect signal
as well as the Display Data Channel (DDC) signals, for a total of three channels.
A typical application of CBTL03SB212 is on motherboards where one of two GPU display
sources needs to be selected to connect to a display 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 CBTL03SB212 can also be used in the reverse topology, e.g., to connect
one display source device to one of two display sink devices or connectors.
GPU1
CBTL03SB212
AUX1+
AUX1−
AUX2+
2:1
MUX
AUX2−
+3.3 V
2 kΩ
DDC_CLK1
DDC_DAT1
DDC_CLK2
2:1
MUX
DDC_DAT2
HPD_1
HPD_2
2:1
MUX
GND
100 kΩ
AUX+
AUX−
100 kΩ
+3.3 V
DDC_CLK
DDC_DAT
HPD
GPU2
SEL, XSD_N
Fig 1. CBTL03SB212 application example
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