ISO7741: Safety limiting values vs. signal integrity and termination for high-speed signals

Hi TI Experts,

I have an application where we are planning to use multiple ISO7741DW isolators.

The isolators will serve a couple of purposes:

1. Isolation barrier for "standard" product safety (e.g. UL/CSA/EN 61010-1)
   
   
2. Measure to demonstrate independence in terms of Functional Safety (e.g. IEC 61508-2)
   1. To block cascading failures (e.g. over-voltage) from propagating between redundant channels that are supposed to be "independent" (e.g. failure in one channel should not propagate to redundant channel or else system is no longer HFT>0)
   2. To block cascading failures from propagating between safety and non-safety circuits, otherwise the non-safety circuit needs to be treated as a safety circuit (e.g. non-safety circuit FIT rates need to be included in PFD and SFF calculations, and included as part of the safety function).

I have read about "safety limiting values" and understand the need to keep parameters (e.g. current) within the safety limiting values even under fault conditions to maintain the insulation barrier (and thus maintain independence in terms of Functional Safety).

https://e2e.ti.com/blogs_/b/analogwire/posts/understand-and-apply-safety-limiting-values-for-digital-isolators

My question is, does TI have any recommendations / app notes / techniques for how to balance techniques to conform with safety limiting values with also maintaining signal integrity / line termination techniques for moderately high-speed signals?

My searches didn't come up with anything.

We are worried about inserting series resistors in the 100s of ohms to limit fault current to conform with safety limiting values and how that might affect signal integrity and proper signal termination for some serial communication links (e.g. 5-50MHz SPI, 100-500Mbps LVDS).

Are there any recommendations TI could provide? That would be much appreciated.

Best Regards,

USO