SLLA626 September   2023

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Migrating from TI HD3SS460 to TMUXHS4446
    1. 2.1 Pinout Differences
    2. 2.2 Package Differences
    3. 2.3 Protocol Differences
  6. 3PCB Layout Recommendations
  7. 4Summary
  8. 5References

2.3 Protocol Differences

In addition to pinout and package differences, HD3SS460 and TMUXHS4446 also differ in that HD3SS460 supports USB 3.2 Gen 1 x 1 and DP 1.2, and TMUXHS4446 supports USB 3.2 Gen 2 x 1and DP 1.4.

As mentioned in Table 2-4, the loss budget for each device differs in that for HD3SS460, the loss budget depends on the type of connectors used, but for TMUXHS4446, the loss budget is a maximum of 2 3 dB no matter which connectors are used. For a visual depiction and comparison of the loss budgets of USB 3.2 Gen 1 and USB 3.2 Gen 2, see the System Loss topic in USB System Design Considerations: Switches and Redrivers, white paper.

Table 2-4 addresses the primary differences between HD3SS460 and TMUXHS4446 as related to the distinct characteristics of USB 3.2 Gen 1 x 1, DP 1.2, USB 3.2 Gen 2 x 1, and DP 1.4.

Table 2-4 Protocol Differences
Device HD3SS460 TMUXHS4446
Protocol USB 3.2 Gen 1 x 1 DP 1.2 USB 3.2 Gen 2 x 1 DP 1.4
Speed 5Gbps 5.4Gbps 10Gbps 8.1Gbps
Loss budget Different for each connector 23 dB for all connectors

As evidenced by the ability to support USB 3.2 Gen 2 and DP 1.4, TMUXHS4446 offers customers a design that enables higher bandwidth and a more robust loss budget.