SN74AUC2G07: Maximum voltage applied to output pin

Zach Kimble

Intellectual 2010 points

Part Number: SN74AUC2G07

Tool/software:

Hello,

In the datasheet for SN74AUC2G07, there are two specs for the absolute maximum output voltage:

I would like to use a 1.8V supply with a pullup on the output to 3.3V. Based on the first spec, it seems like this is okay. However, this would violate the second spec. Is the second spec for when the output is driving low and the first spec for when the output is high impedance? Can I safely pull the output up to 3.3V?

Thank you!

Best regards,

Zach Kimble

over 1 year ago

0 Clemens Ladisch over 1 year ago

Guru 319150 points

When an open-drain output is "high", it is actually off, so the first specification applies. (And the recommended operating conditions agree.)

0 Zach Kimble over 1 year ago in reply to Clemens Ladisch

TI__Intellectual 2010 points

Hi Clemens,

Thank you for your response. Is there any issue during the time when the open drain output switches from high to low? There will be a brief moment where the voltage is greater than VCC + 0.5V while the voltage is being pulled down from 3.3V to 0V.

Best regards,

Zach Kimble

+1 Clemens Ladisch over 1 year ago in reply to Zach Kimble

Guru 319150 points

See footnote (2); the pull-up resistor limits the current to a safe value.

0 Zach Kimble over 1 year ago in reply to Clemens Ladisch

TI__Intellectual 2010 points

Thank you Clemens!

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SN74AUC2G07: Maximum voltage applied to output pin