Datasheet

Section 19 EEPROM
Rev.5.00 Nov. 02, 2005 Page 359 of 500
REJ09B0027-0500
19.5 Usage Notes
19.5.1 Data Protection at V
CC
On/Off
When V
CC
is turned on or off, the data might be destroyed by malfunction. Be careful of the
notices described below to prevent the data to be destroyed.
1. SCL and SDA should be fixed to V
CC
or V
SS
during V
CC
on/off.
2. V
CC
should be turned off after the EEPROM is placed in a standby state.
3. When V
CC
is turned on from the intermediate level, malfunction is caused, so V
CC
should be
turned on from the ground level (V
SS
).
4. V
CC
turn on speed should be longer than 10 us.
19.5.2 Write/Erase Endurance
The endurance is 10
5
cycles/page (1% cumulative failure rate) in case of page programming and
10
4
cycles/byte in case of byte programming. The data retention time is more than 10 years when a
device is page-programmed less than 10
4
cycles.
19.5.3 Noise Suppression Time
This EEPROM has a noise suppression function at SCL and SDA inputs, that cuts noise of width
less than 50 ns. Be careful not to allow noise of width more than 50 ns because the noise of with
more than 50 ms is recognized as an active pulse.