High-Performance Multiplexer/Demultiplexer Switch for Thunderbolt Applications

CBTL05024BS

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.

Product Details

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Block Diagram

CBTL05024 Block Diagram

CBTL05024 Block Diagram
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Features

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 α
    • 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 α (typical) 16 α (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 α (maximum)
    • 100 kHz 3.3 V voltage swing signal
  • Both AUXIO+ and AUXIO- outputs have 85 kα (∓20 %) resistors
    • The 85 kα AUXIO- pull-up resistor
    • The 85 kα AUXIO+ pull-down resistor is always present

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 α
    • 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 α (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

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 µα to prevent driving the 1 Mα pull-down to a HIGH level
  • Integrated LSRX buffer with 1 M pull-down resistor (R1) on the LSRX buffer input
  • Integrated 8.75 kα 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 µW
  • 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 x 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

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