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參數(shù)資料
| 型號(hào)： | AM29LV200BT-55RFC |
| 廠商： | SPANSION LLC |
| 元件分類： | PROM |
| 英文描述： | 128K X 16 FLASH 3V PROM, 55 ns, PDSO48 |
| 封裝： | REVERSE, MO-142DD, TSOP1-48 |
| 文件頁數(shù)： | 8/47頁 |
| 文件大?。?/td> | 1095K |
| 代理商： | AM29LV200BT-55RFC |
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14
Am29LV200B
September 20, 2005
Figure 2.
Temporary Sector Unprotect Operation
Hardware Data Protection
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 VCC
power-up and power-down transitions, or from system
noise.
Low VCC Write Inhibit
When VCC is less than VLKO, the device does not
accept any write cycles. This protects data during VCC
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 VCC
is greater than VLKO. The system must provide the
proper signals to the control pins to prevent uninten-
tional writes when VCC is greater than VLKO.
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# =
VIL, CE# = VIH or WE# = VIH. To initiate a write cycle,
CE# and WE# must be a logical zero while OE# is a
logical one.
Power-Up Write Inhibit
If WE# = CE# = VIL and OE# = VIH during power up, the
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.
START
Perform Erase or
Program Operations
RESET# = VIH
Temporary Sector
Unprotect Completed
(Note 2)
RESET# = VID
(Note 1)
Notes:
1. All protected sectors unprotected.
2. All previously protected sectors are protected once
again.
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