PCA6416A

[VidhyaJ]

HI Team,

Can PCA6416A  IO pins be driven before VCC is applied?

Kindly confirm.

Thanks,

Vidhya

[michs23]

No, the IO pins of the PCA6416A should not be driven before applying VCC. Driving them without power can damage the device and lead to unpredictable AZ DMV behavior. Always apply VCC first, allow for stabilization, and then drive the I/O pins. Refer to the datasheet for specific guidelines and operating ranges.

[TomasVaverka]

Hi Vidhya,

The I/O pins should not be driven before VDD(P) is applied as this could lead to unintended behavior or damage. All I/Os are initialized as inputs at power-on and are only functional after VDD(P) reaches its operating level​.

BRs, Tomas

[VidhyaJ]

HI Team,

Refer to the link below,

https://www.nxp.com/docs/en/application-note/AN469.pdf

page no: 37, question No:5 specifies it is ok to drive IO pins before VCC is applied.

Kindly clarify.

Thanks,

Vidhya

[TomasVaverka]

Hi Vidhya,

The statement in the AN469 regarding PCA9501 IO pins being driven before VCC is specific to that device. The PCA6416A's internal structure differ from the PCA9501 and we do not really recommend applying voltage to I/O pins before VDD(P).

BRs, Tomas

[VidhyaJ]

HI Tomas,

can you suggest an I2C based 16bit NXP IO expander part which supports IO pins available before VDD?

Thanks,

Vidhya

[VidhyaJ]

Hi Tomas, 

Does PCA9539 allows IO pins driven before VCC is applied?

Kindly confirm.

Regards,

Vidhya

[TomasVaverka]

Hi Vidhya,

Yes, it does.

BRs, Tomas

[VidhyaJ]

Hi Tomas,

ok. PCA9539RBS,118 meets my requirement of IO pins driven before VCC is applied.

1. But there is a response from NXP that this part will be WIT??

Kindly confirm if this part can be used? or is there any other series for my requirement?

2. I need the following details of the selected part

1. Confirmation on whether this part is currently ACTIVE
2. REACH
3. ROHS
4. FIT (Failure In Time)
5. MSL
6. ECCN
7. FINISH
8. EOL
9. Part Availability for 10 years

Kindly revert.

Thanks and Regards,

Vidhya

[TomasVaverka]

Hi Vidhya,

Regarding the longevity and details in the second question, please create a standard support ticket for my colleagues dealing with such non-technical questions.

BRs, Tomas

[VidhyaJ]

Hi Tomas,

what is your feedback on 1st point?

Can you share link to raise support ticket?

Thanks and Regards,

Vidhya

[TomasVaverka · Accepted solution]

Hi Vidhya,

The support ticket (case) can be created here:

https://support.nxp.com/s/?language=en_US

BRs, Tomas

[VidhyaJ]

Thanks Tomas.

I hope I can use PCA9539RPW,118 which meets IO pins driven before VCC is applied.

Regards,

Vidhya

[VidhyaJ]

Hi Thomas,

Any feedback on the 1st point?

Thanks,

Vidhya

[michs23]

No, the IO pins of the PCA6416A should not be driven before applying VCC. Driving them without power can damage the device and lead to unpredictable behavior. Always apply VCC first, allow for stabilization, and then drive the I/O pins. Refer to the datasheet for specific guidelines and operating ranges.

[VidhyaJ]

Hi Michs,

 PCA9539RBS,118 meets my requirement of IO pins driven before VCC is applied.

Can you confirm the same?

Thanks and Regards,

Vidhya