The DS125MB203 is an extremely low-power high-performance dual-port 2:1 mux and 1:2 switch/fanout designed to support high-availability systems using PCIe Gen-3/2/1, 10G-KR, and other high-speed interface serial protocols up to 12.5 Gbps. The integrated signal conditioning function eliminates the need for external devices, reducing BOM cost and board space. The receiver's continuous time linear equalizer (CTLE) provides a boost of up to +30 dB at 6.25 GHz (12.5 Gbps) and is capable of opening an input eye that is completely closed due to inter symbol interference (ISI) induced by interconnect medium such as 30in+ backplane traces or 8m+ copper cables. The transmitter provides a de-emphasis boost of up to -12 dB and output voltage amplitude control from 700 mV to 1300 mV.

When operating in 10G-KR and PCIe Gen-3 mode, the DS125MB203 transparently allows the host controller and the end point to optimize the full link and negotiate transmit equalizer coefficients. This seamless management of the link training protocol ensures system level interoperability with minimum latency. With a low power consumption of 390 mW (typ) total or 195 mW/port (bidirectional) and option to turn off unused ports, the DS125MB203 enables energy-efficient system design. A single supply of 3.3V or 2.5V is required to power the device.

The programmable settings can be applied via pin settings, SMBus (I2C) protocol or an external EEPROM. When operating in the EEPROM mode, the configuration information is automatically loaded on power up. This eliminates the need for an external microprocessor or software driver.

• Comprehensive Family, Proven System Interoperability
  • DS125BR111: One-Lane Repeater
  • DS125BR210: Two-Channel Repeater
  • DS125BR401: Four-Lane Repeater
  • DS125BR800: Eight-Channel Repeater
  • DS125MB203: Two-Port, 2:1/1:2 Mux
  • DS125DF410: Four-Channel Retimer With CDR
• Low 65-mW/Channel (Typical) Power Consumption, With Option to Power Down Unused Channels
• Transparent Management of Link Training Protocol for PCIe and 10G-KR
• Advanced Signal Conditioning Features
  • Receive Equalization up to 30dB at 6.25 GHz
  • Transmit De-emphasis up to -12dB
  • Transmit Output Voltage Control: 700 mV to 1300 mV
• Programmable via Pin Selection, EEPROM, or SMBus Interface
• Single Supply Voltage: 2.5V or 3.3V (selectable)
• 40°C to 85°C Operating Temperature Range
• 3-kV HBM ESD Rating
• Flow-Thru Pinout in 10mmx5.5mm 54-Pin Leadless QFN Package