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TPS3890: Have I made a mistake here by only bringing MR_N up to 1.8V?

Part Number: TPS3890

Looking at the datasheet I expected this to work as the threshold is 0.25*VDD = 1.25V. But in my board reset is always low. Could be another problem but I just wanted to check this out too.

5V is up, 3.3V is up, 1.8V is up and PGOOD_1V8 = 1.8V, RESET_N is low.

Thank you