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

3 Codesign: 25GbE 8-Channel Retimer or Redriver with Crosspoint

TI has two 8-channel retimers and three 8-channel redrivers which support 25G Ethernet. The retimer part numbers are DS250DF810 and DS280DF810, while the redriver part numbers are DS280BR810, DS280BR820, and DS280MB810. All of these devices use a 8mm × 13mm, 135-pin BGA package and are nearly pin-to-pin compatible. A single board codesign can implement all 5 devices with minimal modifications, allowing designers to perform system-level testing before determining which device is best designed for a particular application.

Table 3-4 shows a comparison of features between DS2x0DF810, DS280BR8x0, and DS280MB810.

Table 3-1 DS2x0DF810, DS280BR8x0, and DS280MB810 Feature Comparison
Type DS2x0DF810 DS280BR8x0 DS280MB810
Equalization capability 35dB 15-17dB 17dB
Receiver equalization CTLE and DFE CTLE CTLE
Transmitter equalization 3-tap FIR filter Fixed delay 3-tap FIR filter None
Signal chain linearity Nonlinear Linear or nonlinear Linear
Crosspoint 2x2 crosspoint None 2x2 crosspoint
Crosspoint control Register N/A Register or MUX pins
Calibration clock 25MHz clock required Not required, can buffer 25MHz clock Not required, can buffer 25MHz clock
Supply voltage 2.5V 2.5V 2.5V
Maximum current 1330mA 426mA 389mA