AM29F400BT-50SE Spansion Inc., AM29F400BT-50SE Datasheet - Page 14

• Manufacturer Part Number: AM29F400BT-50SE
• Manufacturer: Spansion Inc.

Specifications of AM29F400BT-50SE

• Lead Free Status / Rohs Status: Not Compliant

Hardware Data Protection
The command sequence requirement of unlock cycles
for programming or erasing provides data protection
against inadver tent writes (refer to Table 5 for
command definitions). In addition, the following hard-
ware data protection measures prevent accidental
erasure or programming, which might otherwise be
caused by spurious system level signals during V
power-up and power-down transitions, or from system
noise.
Low V
When V
accept 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
12
CC
CC
Write Inhibit
is less than V
LKO
. The system must provide the
LKO
, the device does not
D A T A
Am29F400B
CC
CC
CC
S H E E T
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
21505E8 November 11, 2009
. To initiate a write cycle,
IH
during power up, the
LKO
.