AN1009

Remedies

programmable power supply from a positive voltage to 0 volts without taking care to step

down the voltage can generate a negative undershoot pulse.

The fourth step is to protect each of the pins, mentioned in Table 1: "List of the pins on

devices that are affected by the problem", by its own individual Schottky diode. No pin

should exceed -0.3 V, and their collective reverse current should not be allowed to exceed

-1.0 mA, especially when the memory device is being battery-powered.

DocID006391 Rev 2

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