28G – Quad Channel CDR/Retimer

The HXC42400 is a uni-directional Quad Channel CDR / Retimer for retiming data rates from 25Gbps to 28.05Gbps. It is optimized for 100Gbps Ethernet, OIF CEI-28G-VSR and OTU-4 Optical Transport applications. The HXC42400 can be used in either direction of a transceiver module and can be adopted into QSFP28+, or CFP2/CFP4 modules because of its low 100mW per channel power dissipation. In Bypass operation, the HXC42400 supports legacy data rates up to 16Gbps.

Designed for direct DC-coupled anode drive of the DFB laser diode for cost-effective and compact assemblies. Available in FCBGA 5x5mm form.


  • Quad 25 – 28Gbps CDR / Retimer
  • Bypass-mode to support legacy data rate up to 16Gbps
  • Programmable 3-tap output de-emphasis for transmit
  • Adaptive linear equalizer and decision-feedback equalizer (DFE) to cover up to 16dB lossy channel in receiver
  • Low sensitivity of 20mVPPD and adjustable threshold level of data sampler
  • Reference-less and Master channel-less operation
  • Independent, adaptive bandwidth control in RX CDR for optimum jitter tolerance
  • Programmable output swing up to 1200mVpp
  • Internal and automatic DC and phase offset calibrations
  • On-chip testability; EOM, JTOL, PRBS generator/checker, local/remote loopback,
  • Polarity (P/N) inversion
  • I2C control interface

Product Options

Orderable Part ID Part Status Pkg. Code Pkg. Type Temp. Grade Carrier Type Buy Sample
HXC42400-BFI Active ZZZ VFQFPN C Tube Availability
HXC42400-EVB Active BD0 BOARD C Box Availability

Technical Documentation

Title Other Languages Type Format File Size Date
HXC42400 Product Brief Product Brief PDF 183 KB Aug 16, 2017