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TLV1702: The output at below minimum voltage supply (Vs)

Part Number: TLV1702
Other Parts Discussed in Thread: TLV7042, TLV7032, , TLV1704, TLC3704, TLV3704

Hello

We are considering to use TLV1720.

In our circuit, the output of TLV1720 must be high impedance.at low voltage below 2.0V.

Does TLV1720 behave like above?

If above behavior is not correct, would you introduce us other comparators?

Regards,

  • We will need to review performance below 2v and get back to you. If your max operating voltage is less than 6.5v, I suggest you consider the tlv7032 and tlv7042 family which has a power on reset POR circuit that controls the output when below the operating voltage range.

    Chuck

  • Hi Chuck

    Thank you for your reply.

    I am looking forward to receive the result of your review.

     Regards,

  • Thanks for your patience. I’m pretty sure it will be high Z at some voltage below 2v but I want to make sure.

  • Hi Chuck

    Thank you for your support.

    The comparator "tlv7032" that you introduce me in first reply is dual-channel but we need quad-channel IC. 

    Would you introduce me quad type of "tlv7032"?

     Regards,

  • Yanagawa-san

    Unfortunately the TLV7032 and TLV7042 are only available in dual and single channel versions today.  So if 4-channels are required and the output needs to be warranted at power-up or power-down, two duals would be required.

    I reviewed the functionality of the TLV1702 below 2V with our design team, and we have determined that it is not possible to assume that the output of the TLV170x devices will be high Z.  When the supply is much lower, for example less than 0.5V, the output will be high Z since the output stage is bipolar and there is not enough voltage to turn on the low side transistor.  However, as the supply voltage increases to the recommended operating voltage, it is not possible to define the output state.  Likewise, for a supply that is turning off, the output will most likely remain in its present output state as the supply ramps down until the input stage collapses.  At this point the output voltage could change states as the supply ramps below the threshold voltage of the output transistor.

    Chuck

  • Hi Chuck

    Thank you for giving me a lot of useful advice.

    Do you have push-pull output type about TLV1704?

    Best regards,

  • Yanagawa-san

    Your two options that are QUAD and push-pull output stage are TLC3704 and TLV3704.

    However, if you still require high Z on the output when below the operating voltage range, neither of these devices will meet that need.

    For that requirement, you need a comparator with a power on reset circuit and we have only recently started including that function in our designs.

    Chuck

  • Yanagawa-san

    We have not seen any response for a while, so I am going to close this thread.  If you have any additional questions, feel free to reply or open a new thread.

    Chuck