LM239A-EP: Tie the open drain output through pull-up resistor to a voltage while the device is unpowered

Xiang Maverick

Part Number: LM239A-EP

If the device is unpowered, Can I tie the open drain output through pull-up resistor to a voltage (for example 1.8V). Would the device be powered through the output pin?

over 1 year ago

0 Clemens Ladisch over 1 year ago

Guru 243180 points

The absolute maximum ratings allow any voltage up to 36 V. The I_OH specification shows that only a leakage current flows.

0 Xiang Maverick over 1 year ago in reply to Clemens Ladisch

Intellectual 750 points

Does this mean the device will not be powered through the output pin?

0 kai klaas69 over 1 year ago

Guru 140200 points

Hi Xiang,

see section 3.4:

Application Design Guidelines for LM339, LM393, TL331 Family Comparators (Rev. B)

But I don't know wheter this info is also valid for your "EP"-version.

Kai

+1 Paul Grohe over 1 year ago in reply to Xiang Maverick

TI__Mastermind 49906 points

Hello Xiang,

There will be a few nA of leakage to V+ and GND, but nowhere enough to power the comparator (or whatever else is on the V+ line). At 1.8V, I would not worry about it.

The information in the appnote is also valid for the -EP devices.

Amplifiers

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LM239A-EP: Tie the open drain output through pull-up resistor to a voltage while the device is unpowered