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USB superspeed peripherals Forum Discussions

Zac0218
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Hi,

This is Zac from HPE.

We used CYUSB303X on one specific board for a while but now we need to migrate few power ICs to other vendors due to component shortage.

I notice that the CYUSB303X specified the voltage ramp up rate in the datasheet.

Our new power IC has similar 1.2V output ramp up rate which is close to CYUSB303X's: 50V/ms.

I'd like to know whether it's going to raise any concern or not.

Kindly advise.

Much appreciated.

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1 Solution
JayakrishnaT_76
Moderator
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First question asked 1000 replies posted 750 replies posted

Hello,

Please let us know the ramp up rate of the power IC.

As mentioned in the datasheet of CYUSB303x, if the ramp up rate is less than 50V/ms, then it should be fine.

Best Regards,
Jayakrishna

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JayakrishnaT_76
Moderator
Moderator
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First question asked 1000 replies posted 750 replies posted

Hello,

Please let us know the ramp up rate of the power IC.

As mentioned in the datasheet of CYUSB303x, if the ramp up rate is less than 50V/ms, then it should be fine.

Best Regards,
Jayakrishna
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Hi Jaya,

Thanks for the prompt reply.

The core 1.2V VDD ramp rate is about 80us which is 15v/ms.

However, the IO 3.3V ramp rate is larger than 50V/ms.

Will it be a concern?

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Hello,

Yes, it will be a concern. As mentioned in the datasheet, the Core and IO supplies can have a maximum ramp up rate of 50V/ms only. We strongly recommend to follow the limits of each parameters mentioned in the datasheet.

Best Regards,
Jayakrishna
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