TPS3808: Is there any better reset delay time accuracy solution than TPS3808?

Part Number: TPS3808

Hello team,

I'm looking for a solution which has better reset delay time accuracy than TPS3808.
As described on the datasheet, TPS3808 has 40% accuracy, but I need to find <30% accuracy due to the specific application requirement.
The typical reset delay time is 800msec.
Is there any good idea to solve it?

Thanks in advance.
Shinya Sawamoto
TI Japan East area FAE