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  • Translate Voltages for RGMII

    • SCEA109A July   2021  – August 2021 SN74AVC8T245 , SN74AVC8T245-Q1 , SN74AXC8T245 , SN74AXC8T245-Q1 , SN74LXC8T245

       

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  • Translate Voltages for RGMII
  1.   1
  2.   2
  3.   Design Considerations
  4.   Recommended Parts
  5. IMPORTANT NOTICE
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APPLICATION BRIEF

Translate Voltages for RGMII

RGMII is a high-bandwidth data bus protocol with very strict timing considerations. The following device recommendations are provided as a suggested solution as they can support the data rates required for RGMII interfaces; however, because the RGMII specification is defined without consideration for voltage level translation, board-level assessment of key timing parameters and assessment of performance within the system is encouraged.

Example of Using Voltage Translation with RGMII

Design Considerations

  • Board layout is critical to the success of RGMII translation; we recommend using signal integrity simulations and prototyping for any design
  • Use active translators for maximum data rate
  • Use one device for all TX signals and one for all RX signals to minimize channel-to-channel skew
  • See Low Voltage Translation For SPI, UART, RGMII, JTAG Interfaces for details regarding the performance of SN74AXC8T245 in RGMII applications
  • Place translators closest to the low-voltage device, if possible, to improve signal integrity
  • Consider source-terminating signals if sent over 12 cm (4700 mil) or longer traces
  • Need additional assistance? Ask our engineers a question on the TI E2E™ logic support forum

Recommended Parts

Part Number Automotive Qualified RGMII Voltage Translation Range Device Maximum Data Rate (Mbps) Features
SN74AXC8T245 2.5 V to 3.3 V 380 Mbps

Glitch-free power supply sequencing

Outputs are disabled when either supply is 0 V

Active translation architecture

SN74AXC8T245-Q1 ✓
SN74AVC8T245 1.8 V to 3.3 V 320 Mbps

Active translation architecture

SN74AVC8T245-Q1 ✓

For more devices, browse through the online parametric tool where you can sort by desired voltage, channel numbers, and other features.

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