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TPS3808: TPS3808G18DBVR Reset Delay

Durga Srinivasu Jarajapu
Prodigy 80 points

Part Number: TPS3808

Hi, 

We are using TPS3808G18DBVR supervisor circut for 1.8V supply monitor in my application. we connected pins as mentioned below

VDD = connected to 3.3V and added 0.1uF decap

SENSE = conected to1.8V and 0.01 decap

GND = Board Ground

CT = open (NC)

#MR = open (NC)

Reset = connected to MCU with 10K pull up to 3.3V.

I am measured reset dealy time and it is crossing 28ms which is maximum reset delay time for CT = open condition.

image.png

I observed same behaviour in other board as well.

1.8V Reset Delay :

image.png

We are using same series fixed voltage supervisor ICs TPS3808G50DBVR, TPS3808G33DBVR with same connection as above expect for sense pin connected respective sense volatges 5V, 3.3V respectively and we are seeing reset delay times around 20ms for both the circuits.

5V reset delay:

image.png

3.3V reset delay :

image.png

Can you explain why for 1.8V IC TPS3808G18DBVR, we are seeing more reset dealy ?

Reagrds,

Srinivasu