TPS3840: Capacitor on MR pin

Shota Mago

Part Number: TPS3840
Other Parts Discussed in Thread: TPS3801

Hi team,

My customer would like to place a small capacitor on MR pin in order to prevent unintentional reset by noise copuling.

Is it okay to place capacitor on MR pin?

Background of this question is some SVS such as TPS3801 specify "Input transition rise and fall rate at MR" while TPS3840 doesn't specify the parameter.

Best regards,

Shota Mago

over 1 year ago

+1 Trailokya Rai over 1 year ago

TI__Genius 11071 points

Hi Shota Mago San

MR pin can handle some noise from the systems.

VIH - VIL = 0.7VDD - 0.6V (section 7.6)

Also it has ability to reject any high fterquency coupling where the pulse width is <300ns. (section 7.6)

You can use small capcitor , how ever it will increase delay time due to 100 kohm internal MR pull up resistor.

Regards

Trailokya

0 Shota Mago over 1 year ago in reply to Trailokya Rai

TI__Expert 6910 points

Hi Trailokya-san,

Thanks for your quick reply!

Best regards,

Shota Mago

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TPS3840: Capacitor on MR pin