NXP's high performance multiplexer/demultiplexer switch for Thunderbolt applications

Image of NXP Semiconductor's CBTL05024The 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 the 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 x 3 mm HVQFN24 package with 0.4 mm pitch.

Features and Benefits
  • The input of the HPD (Hot Plug Detect) buffer is 5 V tolerant
  • HPDOUT and CA_DETOUT buffers
    • CA_DET input leakage current < 0.1µA to prevent driving the 1 MΩ pull-down to a HIGH level
  • Integrated LSRX buffer with 1 MΩ pull-down resistor (R1) on the LSRX buffer input
  • Integrated 8.75 kΩ 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
CBTL05024 Multiplexer/Demultiplexer
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Published: 2014-05-08