NVSRAM fail

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ChVo_3922381
Level 1
Level 1

What could cause the NVSRAM to cease allowing writes?  We write to the device as part of an active test, but cannot read the latest data, only previous data so the test fails.

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1 Solution

Hi Charles,

You can check the reliability data for the device in the below link under Quality and RoHS tab. Let us know what other support we can provide you to help you out on this.

Thanks and Regards,

Pradipta.

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7 Replies
SudheeshK
Moderator
Moderator
Moderator
250 sign-ins First question asked 750 replies posted

Hi,

Could you please let us know the below details?

1. What is the MPN of the Cypress nvSRAM that you use?

2. Please explain how you test and observe this failure.

Thanks and Regards,

Sudheesh

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The MPN is CY14V104NA-BA25XIT.

The test is performed over a serial link to an LS1043A processor. A write command is issued in Uboot then a read command to verify the address contains the data just written. This test successfully passed multiple times at different temperature levels, before ceasing.

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Hi Charles,

While testing are you always under datasheet operating conditions for the device. Also is the device power cycled in between ? It can happen that the device is not getting powered up correctly.  Are your rise times and fall times for the input and power supply below 1.8 ns ?

Thanks,

Pradipta.

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Pradipta,

We are testing the device under datasheet operating conditions.  The power supply rise and fall times are within the specified limits. The device is powered during the temperature cycles.  I would like to review the device reliability data and recommended thermal profile for solder/reflow. The manufacturer's web site is woefully lacking direct support.

Regards,

Chuck

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Hi Charles,

You can check the reliability data for the device in the below link under Quality and RoHS tab. Let us know what other support we can provide you to help you out on this.

Thanks and Regards,

Pradipta.

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Thanks for the reliability info. Do you have a recommended solder / reflow profile for installing the device?

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Hi

Please refer to the link given below.

http://www.cypress.com/documentation/other-resources/cypress-reflow-profile

Thanks,

Pradipta.

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