AM29F080B-75EI Spansion Inc., AM29F080B-75EI Datasheet - Page 11

• Manufacturer Part Number: AM29F080B-75EI
• Description: IC,EEPROM,NOR FLASH,1MX8,CMOS,TSSOP,40PIN,PLASTIC
• Manufacturer: Spansion Inc.

Hardware Data Protection
The command sequence requirement of unlock cycles
for programming or erasing provides data protection
against inadvertent writes (refer to the Command Defi-
nitions table). In addition, the following hardware data
protection measures prevent accidental erasure or pro-
gramming, which might otherwise be caused by spuri-
ous system level signals during V
power-down transitions, or from system noise.
Low V
When V
cept any write cycles. This protects data during V
power-up and power-down. The command register and
all internal program/erase circuits are disabled, and the
device resets. Subsequent writes are ignored until V
is greater than V
CC
CC
Write Inhibit
is less than V
LKO
. The system must provide the
LKO
, the device does not ac-
CC
power-up and
P R E L I M I N A R Y
Am29F080B
CC
CC
proper signals to the control pins to prevent uninten-
tional writes when V
Write Pulse “Glitch” Protection
Noise pulses of less than 5 ns (typical) on OE#, CE# or
WE# do not initiate a write cycle.
Logical Inhibit
Write cycles are inhibited by holding any one of OE# =
V
CE# and WE# must be a logical zero while OE# is a
logical one.
Power-Up Write Inhibit
If WE# = CE# = V
device does not accept commands on the rising edge
of WE#. The internal state machine is automatically
reset to reading array data on power-up.
IL
, CE# = V
IH
or WE# = V
IL
and OE# = V
CC
is greater than V
IH
. To initiate a write cycle,
IH
during power up, the
LKO
.
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