TLV4051: Power-up state of output when input between Vit+ and Vit-

Benjamin Lonske

Part Number: TLV4051

When the LTV4051R2 comes out of power-on-reset and the input is between Vit+ and Vit- (ie, between 0.176V and 0.204V) is the output low or high? Unless I missed it this is not indicated in the datasheet.

Thank you,

Ben

11 months ago

0 Chi Nguyen1 11 months ago

TI__Genius 11701 points

Hi Ben,

Thanks for reaching out. For TLV4051R2, during POR the output state is low. Once it comes out of POR, the comparator tracks the input. Since the input is between VIT+ and VIT-, which means it hasnt crossed over 0.204V yet, the output will go high (because 0.204V is greater than the input).

0 Chuck Sins 11 months ago in reply to Chi Nguyen1

TI__Mastermind 24060 points

Ben

I realize that we have proposed an answer but please allow us a couple days to confirm. We keep discussing this internally and we think it’s worth evaluating further to make sure we are correct in our analysis.
Chuck

0 Chi Nguyen1 11 months ago

TI__Genius 11701 points

Hi Ben,

Thank you for patience. After some testing, here is what we saw.

After the comparator comes out of POR,

if IN is above 0.18V, the output is LOW.

if IN is below 0.18V, the output is HIGH.

0 Benjamin Lonske 11 months ago in reply to Chi Nguyen1

Prodigy 155 points

Hi Chi and Chuck,

Thanks for looking into this but we did our own measurements here and think on comparator power-up it is what you said originally, specifically:

if IN is above 0.20V, the output is LOW

if IN is below 0.20V, the output is HIGH

Thanks, Ben

0 Chuck Sins 11 months ago in reply to Benjamin Lonske

TI__Mastermind 24060 points

Sorry Ben

we will need to go back to our design team and lab to review status again. It sounds like we have misinterpreted. I hope to be able to confirm by Thursday.

Thanks for your patience,

Chuck

0 Chi Nguyen1 11 months ago in reply to Chuck Sins

TI__Genius 11701 points

Thanks for your patience Ben. We were able to confirm with our design team that what you saw is indeed true.

if IN is above 0.20V, the output is LOW

if IN is below 0.20V, the output is HIGH

+1 Benjamin Lonske 11 months ago in reply to Chi Nguyen1

Prodigy 155 points

Okay, thanks for checking!

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TLV4051: Power-up state of output when input between Vit+ and Vit-