Welcome, @Terry Rose, to the community!
The differences between STM704 and STM806 are indeed not listed on the first page of the data sheet, but can be found after a close look at the parameter tables:
- VPFI (Power-fail comparator, data sheet, pg. 33)
- STM704: 1.237V±2%
- STM806: 1.237V±4%
- VRST (Reset thresholds, data sheet, pg. 34)
So to answer your question, the cheaper STM806 is the one to use if you have lower accuracy requirements.
Hope that helps?
Regards
/Peter
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