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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