79LV2040RPFE-20 MAXWELL [Maxwell Technologies], 79LV2040RPFE-20 Datasheet - Page 13

• Manufacturer Part Number: 79LV2040RPFE-20
• Description: 20 Megabit (512K x 40-Bit) Low Voltage EEPROM MCM
• Manufacturer: MAXWELL [Maxwell Technologies]

2. Data Protection at V
3. RES Signal
.
4. Software Data Protection Enable
.
20 Megabit (512K x 40-Bit) EEPROM MCM
When V
programming mode by mistake. To prevent this unintentional programming, the EEPROM must be kept in unprogrammable
state during V
RES should be kept at V
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 is input
The 79LV2040contains a software controlled write protection feature that allows the user to inhibit all write operations to the
device. This is useful in protecting the device from unwanted write cycles due to uncontrollable circuit noise or inadvertent
writes caused by minor bus contentions. Software data protection is enabled by writing the following data sequence to the
EEPROM and allowing the write cycle period (t
CC
is turned on or off, noise on the control pins generated by external circuits, such as CPUs, may turn the EEPROM to
CC
on/off by using a CPU reset signal to RES pin.
CC
SS
level when V
on/off
Software Data Protection Enable Sequence
AAAA or 2AAA
CC
Address
is turned on or off. The EEPROM breaks off programming operation when RES
5555
5555
WC
) of 15ms to elapse:
09.07.05 Rev 1
AA AA AA AA AA
15ms
A0 A0 A0 A0 A0
55 55 55 55 55
All data sheets are subject to change without notice
Data
79LV2040
©2005 Maxwell Technologies
All rights reserved
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