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SN74CBTLV1G125: Are there any ESD protection diodes from the inputs to the supply rails, or anything else in these parts that would cause issues with voltage on I/O path when Vdd = 0V

Part Number: SN74CBTLV1G125

E2E,

We ran into a situation where the above parts were unpowered (0 V, Vcc) yet the inputs coming from powered components were at 3.3V.

Would there be any potential overstress?

Are there any ESD protection diodes from the inputs to the supply rails, or anything else in these parts?

We’ve seen a functionality in other devices which sets the I/O to high impedance when VCC is below a certain range (approximately 0V). Can you confirm if that kind of high impedance functionality is or is not included in the design of these particular parts?

 

Thank you,

Adam

  • Hi Adam,

    The SN74CBTLV1G125 offers powered off protection when Vcc=0, meaning the device maintains a high impedance (Hi-Z) state when an IC is powered down therefore eliminating the need for power sequencing and protecting system components.

    When being un-powered you can apply 3.3V to its channel pins without any significant current flowing (Ioff):

    Here is the link to a tech note with more details on how powered-off protection works.

    If you are interested in other switch configurations offering powered-off protection, here is the link to the device search tool highlighting parts with this feature.

    Regards

    Saminah