You should ask the question the other way round, as the data sheet is always the exclusive source for guaranteed functionality. The information in the eStore, on the other hand, may have been entered incorrectly. However, I would also like to point out that the L6920DB was launched on the market back in 2006, the last data sheet change is just as old, and further changes are very unlikely.
As already discussed, it is theoretically possible that the temperature could rise above 85°C under maximum load. As long as you ensure that the maximum junction temperature is not exceeded, the device will continue to function.
Regards
/Peter
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