It was recently discovered that the FM25H20 exhibits problems under certain power-up conditions. If powered-up when either /S or /HOLD is low, a small percentage of the devices could be rendered non-functional.
Fix: The /S pin should be pulled up with a resistor to Vdd and the /HOLD pin can also be pulled up or simply tied to VDD. When the device is powered up, these pins must be inactive.
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