General description

The CBTL05024 is a multiplexer/demultiplexer switch chip optimized to interface the

Thunderbolt/MiniDP connector with Thunderbolt systems. It supports 10.3125 Gbit/s

Thunderbolt or DisplayPort v1.2 channels.

The TB MUX is a 3 : 1 switch that selects between Thunderbolt data path and

DisplayPort v1.2 side-band signals — either DDC or AUX.

The DP MUX is a 2 : 1 switch that selects between DP ML (DisplayPort Main Link) and

LS TX/RX signals. Both LSTX and LSRX are the side-band signals for Thunderbolt

channel. This chip also includes HPD and CA_DET buffers for HPD_IN and CA_DET control signals. CBTL05024 is powered by a 3.3 V supply and it is available in a 3 mm  3 mm HVQFN24 package with 0.4 mm pitch.

Features and benefits

2.1 TB MUX 3 : 1 switch

 This 3 : 1 switch is implemented by two cascaded 2 : 1 switches

 The first 2 : 1 10G MUX is controlled by TB_ENA, AUXIO_EN and DP_PD pins

 The second 2 : 1 AUX MUX is controlled by CA_DET signal multiplexing of the

720 Mbit/s Differential FAUX (or 1 Mbit/s AUX) and DDC (Direct Display Control)

signals

 When CA_DET is HIGH, DDC path is selected

 Differential TB channel

 Low insertion loss: 1.3 dB at 5 GHz

 Low return loss: < 20 dB at 5 GHz

 Low ON-state resistance: 8 

 Bandwidth: 10 GHz

 Low off-state isolation: 20 dB at 5 GHz

 Low crosstalk: 36 dB at 5 GHz

 Differential input voltage VID: 1.2 V (maximum)

 Differential AUX channel

 Low insertion loss: 1.1 dB at 5 MHz; 1.8 dB at 360 MHz

 Low return loss: 18 dB at 5 MHz; 16 dB at 360 MHz

 Low ON-state resistance: 13  (typical); 16  (maximum)

 Bandwidth: 3 GHz

 Low off-state isolation: 80 dB at 5 MHz; 55 dB at 360 MHz

 Low crosstalk: 26 dB at 2.7 GHz

 Common-mode input voltage VIC: 0 V to 3.3 V

 Differential input voltage VID: 1.4 V (maximum)

 DDC channel

 ON-state resistor: 50  (maximum)

 100 kHz 3.3 V voltage swing signal

 Both AUXIO+ and AUXIO outputs have 85 k (20 ) resistors

 The 85 k AUXIO pull-up resistor

 The 85 k AUXIO+ pull-down resistor is always present

2.2 DP MUX 2 : 1 switch

 Multiplexes between differential DP ML signal and LSTX/LSRX signals

 The DP ML (DisplayPort Main Link) runs up to HBR2 data rate of 5.4 Gbit/s

 The low speed DC-coupled signals LSTX and LSRX are 3.3 V single-ended signals

that operate at 1 Mbit/s

 5.4 Gbit/s DP-DPMLO path for DP MUX

 Low insertion loss for DP-DPMLO path: 1.2 dB at 2.7 GHz

 Low return loss for DP-DPMLO path: 15 dB at 2.7 GHz

 Low ON-state resistance for DP-DPMLO path: 9 

 High bandwidth: 5.5 GHz

 Low off-state isolation: 20 dB at 2.7 GHz

 Low crosstalk: 25 dB at 2.7 GHz

 Common-mode input voltage VIC: 0 V to 3.3 V

 Differential input voltage VID: 1.4 V (maximum)

 LS-DPMLO path for DP MUX

 Low insertion loss: single-ended insertion loss (ON) is 1.0 dB at 5 MHz

 Low return loss: single-ended return loss (ON) is 20 dB at 5 MHz

 Low ON-state resistance: 16  (typical) for VDD = 3.3 V

 High bandwidth: Single-ended 3 dB bandwidth is 1 GHz

 Low off-state isolation: single-ended insertion loss (OFF) is 60 dB at 5 MHz

 Low crosstalk: 40 dB at 5 GHz

2.3 General

 The input of the HPD (Hot Plug Detect) buffer is 5 V tolerant

 HPDOUT and CA_DETOUT buffers

 CA_DET input leakage current < 0.1 A to prevent driving the 1 M pull-down to a

HIGH level

 Integrated LSRX buffer with 1 M pull-down resistor (R1) on the LSRX buffer input

 Integrated 8.75 k pull-up resistor (R4) on the LSTX pin

 When AUXIO_EN = 1, TB_ENA = 0 and DP_PD = 1, the CBTL05024 is in

Detect mode

 AUXIO+ and AUXIO of the TB MUX are disabled

 LS path is selected in DP MUX

 CA_DET and HPD buffers are on

 When the CBTL05024 is in Detect mode, this chip consumes < 18 W

 Patent-pending high bandwidth analog pass-gate technology

 Very low intra-pair differential skew (5 ps typical)

 Back current protection on connector pins (AUXIO+/, DPMLO+/, CA_DET and HPD

pins)

 All channels support rail-to-rail input voltage

 All CMOS input buffer with hysteresis

 Single 3.3 V  10 power supply

 HVQFN24 3 mm  3 mm package, 0.4 mm pitch, exposed center pad for thermal relief

and electrical ground

 ESD: 2000 V HBM, 1000 V CDM

 Operating temperature range 20 C to 85 C