Other Parts Discussed in Thread: TLV9032, TLV7011, TLV7021
what will happen to the output when the power on VCC is not yet 2.5V ?
is there any reset circuit inside that can prevent this unstable phase?
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Thanks for your post. Unfortunately, devices such as the LMV331 do not include a power on reset circuit. If that is required, may I suggest our TLV7011 (push pull) or TLV7021 (open drain) family of comparators which has a POR circuit. We just do not have enough characterization data on the LMV331 in order to provide a warranted startup condition. Most likely the LMV331 will start high Z at the output but as it reaches the recommended operating range, it is possible that some unpredictable output conditions could occur. If the TLV7011/21 is not fast enough, we will be releasing a single channel variant of the TLV9032/22 family soon and this will also include POR circuit.
sorry for the delay. I am not exactly sure what you are looking for but essentially a POR circuit holds the output of the comparator in a known state until the supply reaches the recommended operating voltage. Just think of it as a comparator within the comparator that monitors VCC. When the VCC is below the operating voltage, it holds the output in a known state. Once VCC reaches the operating voltage range, the POR circuit relinquishes control of the output and now the output tracks the input of the comparator.