R1EX25002Axx00A/R1EX25004Axx00A
Notes
Data Protection at V CC On/Off
When V CC is turned on or off, noise on S inputs generated by external circuits (CPU, etc) may act as a trigger and turn
the EEPROM to unintentional program mode. To prevent this unintentional programming, this EEPROM have a power
on reset function. Be careful of the notices described below in order for the power on reset function to operate
correctly.
? S should be fixed to V CC during V CC on/off. Low to high or high to low transition during V CC on/off may
cause the trigger for the unintentional programming.
? V CC should be turned on/off after the EEPROM is placed in a standby state.
? V CC should be turned on from the ground level (V SS ) in order for the EEPROM not to enter the unintentional
programming mode.
? V CC turn on speed should be slower than 10 μ s/V.
? When WRSR or WRITE instruction is executed before V CC turns off, V CC should be turned off after waiting
write cycle time (t W ).
REJ03C0357-0002 Rev. 0.02 Jan.14 .2009
page 18 of 20
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