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TPS3809-Q1: Undefined Behavior of RESET Output

Part Number: TPS3809-Q1
Other Parts Discussed in Thread: TPS3809

Hi team,

I see in timing diagram of TPS3809 it says For VDD< 1.1 V, the reset output is Undefined Behavior, does it mean reset output voltage can be any level <1.1V?

Actually I have below test result, there is a 600mV pulse before reset output goes high, is it normal?