SNLA475 October   2024 DS250DF410 , DS250DF810 , DS280BR810 , DS280BR820 , DS280DF810 , DS280MB810 , DS560MB410

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Codesign: 25GbE 4-Channel Retimer or Redriver with Crosspoint
    1. 2.1 DS250DF410 Retimer Overview
    2. 2.2 DS560MB410 Redriver Overview
    3. 2.3 Pin Comparison Table
    4. 2.4 Codesign Schematic Example
    5. 2.5 Notable Codesign Elements
      1. 2.5.1 Calibration Clock
      2. 2.5.2 SMBus Address
      3. 2.5.3 SMBus Controller Mode
      4. 2.5.4 SMBus Pull-Up Resistors
      5. 2.5.5 Interrupt Output
      6. 2.5.6 Mux Select Inputs
  6. 3Codesign: 25GbE 8-Channel Retimer or Redriver with Crosspoint
    1. 3.1 DS250DF810 and DS280DF810 Retimers Overview
    2. 3.2 DS280BR810, DS280BR820, and DS280MB810 Redrivers Overview
    3. 3.3 Pin Comparison Table
    4. 3.4 Codesign Schematic Example
    5. 3.5 Notable Codesign Elements
      1. 3.5.1 AC Coupling
      2. 3.5.2 Calibration Clock
      3. 3.5.3 SMBus Address
      4. 3.5.4 SMBus Controller Mode
      5. 3.5.5 SMBus Pull-Up Resistors
      6. 3.5.6 Interrupt Output
      7. 3.5.7 Mux Select Inputs
  7. 4Summary
  8. 5References

2 Codesign: 25GbE 4-Channel Retimer or Redriver with Crosspoint

TI has one 4-channel retimer and one 4-channel redriver which support 25G Ethernet. These devices, DS250DF410 and DS560MB410 respectively, both use a 6mm × 6mm, 101-pin BGA package and are nearly pin-to-pin compatible. A single board codesign can implement either device, allowing designers to perform system-level testing before determining if the retimer or redriver is better designed for a particular application.

Table 3-4 shows a comparison of features between DS250DF410 and DS560MB410.

Table 2-1 DS250DF410 and DS560MB410 Feature Comparison
Type DS250DF410 DS560MB410
Equalization capability 35dB 18dB
Receiver equalization CTLE and DFE CTLE
Transmitter equalization 3-tap FIR filter None
Signal chain linearity Nonlinear Linear
Crosspoint 2x2 crosspoint 2x2 crosspoint
Crosspoint control Register Register or MUX pins
Calibration clock 25MHz clock required Not required, can buffer 25MHz clock
Supply voltage 2.5V 2.5V
Maximum current 665mA 364mA