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

2.3 Pin Comparison Table

Table 2-2 compares pin functionality of DS250DF410 retimer and DS560MB410 redriver and lists if any design provisions are necessary to support each device with the same codesign.

Table 2-2 4-Channel Retimer or Redriver Pin Comparison Table
Pin Number DS250DF410 Pin Name DS560MB410 Pin Name Provision Needed? Details
A10, A11, A7, A8, A4, A5, A1, A2 RXnP/N RXnP/N No High-speed inputs require AC coupling.
L10, L11, L7, L8, L4, L5, L1, L2 TXnP/N TXnP/N No High-speed outputs require AC coupling.
F1 CAL_CLK_IN GPI Optional DS250DF410: Requires a 25MHz calibration clock input.

DS560MB410: Can optionally buffer an input signal up to 25MHz.
F11 CAL_CLK_OUT GPO Optional DS250DF410: 2.5V buffered replica of CAL_CLK_IN.

DS560MB410: Inverted buffer output from GPI.
D11, D1 ADDR0/1 ADDR0/1 No 4-level straps to configure SMBus Address.
G1 EN_SMB EN_SMB No 4-level strap to select SMBus target mode or controller mode.
G11, H11 SDA/SDC SDA/SDC No SMBus data and clock I/Os. Require 2-5kΩ pull-up resistors.
E1 ALL_DONE_N ALL_DONE_N No EEPROM load status when using SMBus controller mode.
E11 READ_EN_N READ_EN_N No SMBus target mode: Pull high or leave floating for normal operation.

SMBus controller mode: Pull low to initiate EEPROM load.
H1 INT_N RSVD1 Yes DS250DF410: Interrupt open-drain output. Requires 2-5kΩ pull-up resistor.

DS560MB410: Reserved. Can be left floating or pulled low.
D10, D2 TEST0/1 MUXSEL0/1 Optional DS250DF410: Reserved test pins. Can be left floating, tied to GND, or tied to 2.5V.

DS560MB410: Mux select control input. Can be left floating or tied to GND if unused.
E10, E2, H10, H2 TEST2-5 TEST2-5 No Reserved test pins. Can be left floating, tied to GND, or tied to 2.5V.
A3, A6, A9, B1, B2, B3, B4, B5, B6, B7, B8, B9, B10, B11, C1, C6, C11, D6, E3, E5, E7, E9, F3, F4, F5, F6, F7, F8, F9, G2, G3, G5, G7, G9, G10, H6, J1, J6, J11, K1, K2, K3, K4, K5, K6, K7, K8, K9, K10, K11, L3, L6, L9 GND GND No Ground reference.
C3, C9, D3, D4, D5, D7, D8, D9, H3, H4, H5, H7, H8, H9, J3, J9 VDD VDD No 2.5V power supply. TI recommends connecting at least 6 decoupling capacitors as close to the device as possible.