28LV011RT2FI-20 MAXWELL [Maxwell Technologies], 28LV011RT2FI-20 Datasheet - Page 16

• Manufacturer Part Number: 28LV011RT2FI-20
• Description: 3.3V 1 Megabit (128K x 8-Bit) EEPROM
• Manufacturer: MAXWELL [Maxwell Technologies]

28LV011
3.3V 1 Megabit (128K x 8-Bit) EEPROM
When V
is turned on or off, noise on the control pins generated by external circuits, such as CPUs, may turn the EEPROM to
CC
programming mode by mistake. To prevent this unintentional programming, the EEPROM must be kept in unprogrammable
state during V
on/off by using a CPU reset signal to RES pin.
CC
RES should be kept at V
level when V
is turned on or off. The EEPROM breaks off programming operation when RES
SS
CC
become low, programming operation doesn’t finish correctly in case that RES falls low during programming operation. RES
should be kept high for 10 ms after the last data input.
3. Software Data Protection
The software data protection function is to prevent unintentional programming caused by noise generated by external circuits.
In software data protection mode, 3 bytes of data must be input before write data as follows. These bytes can switch the non-
protection mode to the protection mode.
Software data protection mode can be canceled by inputting the following 6 bytes. Then, the EEPROM turns to the non-protec-
tion mode and can write data normally. However, when the data is input in the canceling cycle, the data cannot be written.
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All data sheets are subject to change without notice
05.28.02 Rev 2
©2002 Maxwell Technologies
All rights reserved.