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R1EX24004AxxS0A
Notes
Data Protection at V CC On/Off
When V CC is turned on or off, noise on the SCL and SDA 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 has a power on reset function. Be careful of the notices described below in
order for the power on reset function to operate correctly.
? SCL and SDA should be fixed to V CC or V SS 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 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 longer than 10 μ s.
Noise Suppression Time
This EEPROM have a noise suppression function at SCL and SDA inputs, that cut noise of width less than
50 ns. Be careful not to allow noise of width more than 50 ns.
REJ03C0353-0101 Rev.1.01 Jan. 9, 2009
Page 20 of 22
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