Document
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.
GND
CBTL03SB212
AUX1+ AUX1− AUX2+ AUX2− +3.3 V 2:1 MUX
100 kΩ
AUX+ AUX−
100 kΩ
+3.3 V GPU1
2 kΩ
DDC_CLK1 DDC_DAT1 DDC_CLK2 DDC_DAT2 HPD_1 HPD_2 2:1 MUX HPD 2:1 MUX DDC_CLK DDC_DAT
SEL, XSD_N GPU2
002aag007
Fig 1.
CBTL03SB212 application example
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NXP Semiconductors
CBTL03SB212
DisplayPort Gen2 sideband signal multiplexer
2. Features and benefits
1 : 2 multiplexing of DisplayPort signals 1 high-speed differential channel for Fast AUX or AUX 1 channel for DDC clock and data 1 channel for HPD High-bandwidth analog pass-gate technology Very low intra-pair differential skew (5 ps typical) Switch/MUX position select Shutdown mode CMOS input Shutdown mode minimizes power consumption while switching all channels off Very low operation current of 0.2 mA typical Very low shutdown current of < 10 μA Single 3.3 V power supply ESD 4 kV HBM, 1 kV CDM Available in 4 mm × 4 mm HVQFN20 package
3. Applications
Motherboard applications requiring DisplayPort sideband switching/multiplexing Docking stations Notebook computers
4. Ordering information
Table 1. Ordering information Package Name CBTL03SB212BS HVQFN20 Description plastic thermal enhanced very thin quad flat package; no leads; 20 terminals; body 4 × 4 × 0.85 mm[1] Version SOT917-1 Type number
[1]
Total height after printed-circuit board mounting = 1 mm (maximum).
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CBTL03SB212
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 1 — 21 February 2011
2 of 16
NXP Semiconductors
CBTL03SB212
DisplayPort Gen2 sideband signal multiplexer
5. Functional diagram
AUX1+ AUX1− AUX2+ AUX2−
2:1 MUX
AUX+ AUX−
DDC_CLK1 DDC_DAT1 DDC_CLK2 DDC_DAT2
2:1 MUX
DDC_CLK DDC_DAT
HPD_1 2:1 MUX HPD_2 HPD
SEL, XSD_N
002aag008
Fig 2.
Functional diagram
6. Pinning information
6.1 Pinning
17 AUX1+ 16 AUX1−.
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