INA381-Q1: Io_sink rating of ALERT pin

Hidekazu Someno

Part Number: INA381-Q1

Hi,Team,

Though my customer knows that the sink current of ALERT pin is limited by a pull-up resister, They would like to know the maximum rating current of ALERT pin.

Please tell me the absolute max rating for DC and Peak current of Io_sink.

Figure. 6-37 on the datasheet seems to show "Io_sink vs Vol" characteristics of ALERT pin . If so, It has the sink capability of 10mA.

Regards,

H.Someno

over 2 years ago

0 Javier Contreras4 over 2 years ago

TI__Mastermind 26485 points

Hello Hidekazu,

Figure 6-37 is a typical curve. That would not include the worst case. A guaranteed number is shown on the EC table at 3mA and will yield a 300mV output. So if you assume a linear approximation you can assume a 100Ω to GND. So with 10mA could assume you will get a 1V output. For highest current you need to take into account how low of a voltage is acceptable, power consumption and temperature increase, and voltage limitations on all the pins. Alert cannot go above 6V.

0 Hidekazu Someno over 2 years ago in reply to Javier Contreras4

TI__Expert 5130 points

Thanks for your comments.

I have another one question.

On Figure.6-37, ALERT's VOL is around 40mV at IOL=3mA . But on the EC table, It has VOL=70mV_typ at IOL= 3mA. What is the reason of this difference?

Either Figure 6-37 or the typical value in the EC table wrong?

Regards,

H.Someno

0 Javier Contreras4 over 2 years ago in reply to Hidekazu Someno

TI__Mastermind 26485 points

Hidekazu,

I believe the EC table is done with a 1 sigma distribution calculation and the graph was created from a single unit so they can differ a little.

Regards,

Amplifiers

Amplifiers forum

INA381-Q1: Io_sink rating of ALERT pin