> Thank you for your quick reply. I operate the data flash at min supply > 2.7V. The IC is specs at 2.7 to 3.6V. That may be the problem right there if you are operating the flash at the exact edge of its supply spec. The nominal supply should be high enough so that under worst case conditions and part variations it doesn't go below the minimum required by the flash. Running a 2.7 to 3.6 volt part with a 2.7 volt regulator sounds like a bad idea. ******************************************************************** Olin Lathrop, embedded systems consultant in Littleton Massachusetts (978) 742-9014, olin@embedinc.com, http://www.embedinc.com -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics