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PROM connected to TUSB3410 being erased

Other Parts Discussed in Thread: TUSB3410

We're finding that the PROM (Microchip 24LC02B-I/P) connected to our TUSB3410IVF occasionally is getting cleared. This has only happened on a few times on the units that we have shipped and the entire PROM doesn't always get erased. I'm just starting on the investigation as to why this is happening, but we're thinking it might be surge on the power rails to either the PROM or TUSB3410. Any other suggestions on what else we should look at?

Thanks

Jeff