This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TLV9302: Internal POR

Part Number: TLV9302

Hi,

Does the TLV9302 have the POR circuit internally?

Though the letter from TI Japan is saying it, I could not find it from the datasheet.

In Japanese--------------------------

お使いのオペアンプは不要出力しませんか?『TLV9302』
Vcc 電源の立下り方次第でオペアンプからパルス状の出力が行われるケースがあります。『TLV9302』はPoR 回路を内蔵しているため、Vcc 電圧、立下りシーケンスに依存せず不要出力する事なくお使い頂けます。

In English(by Google)--------------------------

Does your operational amplifier output unnecessary? TLV9302
Depending on how the Vcc power supply falls, there are cases in which a pulsed output is output from the operational amplifier. Since the TLV9302 has a built-in PoR circuit, it can be used without unnecessary output regardless of the Vcc voltage and falling sequence.

--------------------------

Best Regards,

Kuramochi

  • Kuramochi-san,

    With or without a POR, there won't be much difference on power down. Also 'POR' is generic term, the characteristics of POR can vary from one design to another. he exact input voltages and VCC fall rate can make a difference. What are the values when the output is an issue?  The operation under 4.5V supply is undefined. I do not know whether this op amp has a POR or not.

  • Former Member
    0 Former Member

    Hello Kuramochi-san,

    I have spoken with the engineer that is responsible for this part and they have confirmed that there is indeed a POR circuit internally.

    Regardless, I would consider Ron's advice.

    Regards,

    Daniel

  • Daniel, Thank you for the confirmation.

    Kuramochi-san,

    I ran some lab test on the TLV9302 and the POR works on power up and power down. The TLV9302 POR puts the op amp output into a high impedance state. Therefore the output moving in the "wrong" direction (near 2V) is caused by the feedback and load on the output pin. The great news is that the application can fix that by pulling the output in the desired direction.

    Of course there are other reasons for the output change; For example, the inputs might have changed. There are a host of other reasons that vary greatly from one application to another.