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

3.3 Pin Comparison Table

Table 3-2 compares pin functionality of DS2x0DF810 retimers, DS280BR8x0 redrivers, and DS280MB810 redriver with crosspoint and lists if any design provisions are necessary to support each device with the same codesign.

Table 3-2 8-Channel Retimer/Redriver Pin Comparison Table
Pin Number DS2x0DF810 Pin Name DS280BR8x0 Pin Name DS280MB810 Pin Name Provision Needed? Details
C15, B15, B13, A13, B11, A11, B9, A9, B7, A7, B5, A5, B3, A3, C1, B1 RXnP/N RXnP/N RXnP/N No High-speed inputs AC coupled on-chip.
G15, H15, H13, J13, H11, J11, H9, J9, H7, J7, H5, J5, H3, J3, G1, H1 TXnP/N TXnP/N TXnP/N Yes

DS2x0DF810, DS280BR810: High-speed outputs AC coupled on-chip.

DS280BR820, DS280MB810: High-speed outputs require external AC coupling.
E1 CAL_CLK_IN CAL_CLK_IN CAL_CLK_IN Optional

DS2x0DF810: Requires a 25MHz calibration clock input.

DS280BR8x0, DS280MB810: Can optionally buffer a 25MHz clock input. No calibration clock required.
E15 CAL_CLK_OUT CAL_CLK_OUT CAL_CLK_OUT Optional 2.5V buffered replica of CAL_CLK_IN.
D13, E13 ADDR0/1 ADDR0/1 ADDR0/1 No 4-level straps to configure SMBus Address.
E3 EN_SMB EN_SMB EN_SMB No 4-level strap to select SMBus target mode or controller mode.
E12, F12 SDA/SDC SDA/SDC SDA/SDC No SMBus data and clock I/Os. Require 2-5kΩ pull-up resistors.
F13 READ_EN_N 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.
D3 ALL_DONE_N ALL_DONE_N ALL_DONE_N No EEPROM load status when using SMBus controller mode.
F3 INT_N INT_N INT_N No

DS2x0DF810: Interrupt open-drain output. Requires 2-5kΩ pull-up resistor.

DS280BR8x0, DS280MB810: No connect on package. Can be pulled high for codesign compatibility with DS2x0DF810.
E2, E14 TEST0/1 TEST0/1 MUXSEL0/1 Optional

DS2x0DF810, DS280BR8x0: Reserved test pins. Can be left floating, tied to GND, or tied to 2.5V.

DS280MB810: Mux select control input. Can be left floating or tied to GND if unused.
F4, E4, D4, D12 TEST4-7 GND GND No

DS2x0DF810: Reserved test pins. Can be left floating or tied to GND.

DS280BR8x0, DS280MB810: Ground reference.
D6, D8, D10, E5, E6, E7, E8, E9, E10, F6, F8, F10 VDD VDD VDD No 2.5V power supply. TI recommends connecting at least 6 decoupling capacitors as close to the device as possible.
A1, A2, A4, A6, A8, A10, A12, A14, A15, B2, B4, B6, B8, B10, B12, B14, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, D1, D2, D5, D7, D9, D11, D14, D15, E11, F1, F2, F5, F7, F9, F11, F14, F15, G2, G3, G4, G5, G6, G7, G8, G9, G10, G11, G12, G13, G14, H2, H4, H6, H8, H10, H12, H14, J1, J2, J4, J6, J8, J10, J12, J14, J15 GND GND GND No Ground reference.