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參數(shù)資料
| 型號： | SST49LF004B |
| 廠商： | Silicon Storage Technology, Inc. |
| 英文描述： | 4 Mbit LPC Firmware Flash |
| 中文描述： | 4兆位LPC固件閃存 |
| 文件頁數(shù)： | 21/39頁 |
| 文件大小： | 460K |
| 代理商： | SST49LF004B |
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Data Sheet
4 Mbit LPC Firmware Flash
SST49LF004B
21
2003 Silicon Storage Technology, Inc.
S71232-02-000
12/03
Data# Polling (DQ
7
)
When the SST49LF004B device is in the internal Program
operation, any attempt to read DQ
7
will produce the com-
plement of the true data. Once the Program operation is
completed, DQ
7
will produce true data. Note that even
though DQ
7
may have valid data immediately following the
completion of an internal Write operation, the remaining
data outputs may still be invalid. Valid data will appear on
the entire data bus in subsequent successive Read cycles
after an interval of 1 μs. During an internal Erase operation,
any attempt to read DQ
7
will produce a '0'. Once the inter-
nal Erase operation is completed, DQ
7
will produce a '1'.
Data# Polling is valid after the rising edge of the fourth WE#
pulse for the Program operation. For Sector-Erase, Block-
Erase, or Chip-Erase, the Data# Polling is valid after the ris-
ing edge of the sixth WE# pulse. See Figure 15 for Data#
Polling timing diagram. Proper status will not be given using
Data# Polling if the address is in the invalid range.
Toggle Bit (DQ
6
)
During the internal Program or Erase operation, any con-
secutive attempts to read DQ
6
will produce alternating '0's
and '1's, i.e., toggling between 0 and 1. When the internal
Program or Erase operation is completed, the toggling will
stop. The device is then ready for the next operation. The
Toggle Bit is valid after the rising edge of the fourth WE#
pulse for Program operation. For Sector-Erase, Block-
Erase or Chip-Erase, the Toggle Bit is valid after the rising
edge of the sixth WE# pulse. See Figure 16 for Toggle Bit
timing diagram.
Data Protection (PP Mode)
The SST49LF004B device provides both hardware and
software features to protect nonvolatile data from inadvert-
ent writes.
Hardware Data Protection
Noise/Glitch Protection: A WE# pulse of less than 5 ns will
not initiate a Write cycle.
V
DD
Power Up/Down Detection: The Write operation is
inhibited when V
DD
is less than 1.5V.
Write Inhibit Mode: Forcing OE# low, WE# high will inhibit
the Write operation. This prevents inadvertent writes during
power-up or power-down.
Software Data Protection (SDP)
The SST49LF004B provides the JEDEC approved Soft-
ware Data Protection scheme for all data alteration opera-
tion, i.e., Program and Erase. Any Program operation
requires the inclusion of a series of three-byte sequence.
The three-byte load sequence is used to initiate the Pro-
gram operation, providing optimal protection from inadvert-
ent Write operations, e.g., during the system power-up or
power down. Any Erase operation requires the inclusion of
a five-byte load sequence.
TABLE 12: O
PERATION
M
ODES
S
ELECTION
(PP M
ODE
)
Mode
Read
Program
Erase
RST#
V
IH
V
IH
V
IH
OE#
V
IL
V
IH
V
IH
WE#
V
IH
V
IL
V
IL
DQ
D
OUT
D
IN
X
1
Address
A
IN
A
IN
Sector or Block address,
XXH for Chip-Erase
X
X
A
18
- A
1
= V
IL
, A
0
= V
IL
A
18
- A
1
= V
IL
, A
0
= V
IH
Reset
Write Inhibit
Product Identification
V
IL
V
IH
V
IH
X
V
IL
V
IL
X
High Z
High Z/D
OUT
Manufacturer’s ID (BFH)
Device ID (60H)
V
IH
V
IH
T12.0 1232
1. X can be V
IL
or V
IH
, but no other value.
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| SST49LF004B-33-4C-EIE | 4 Mbit LPC Firmware Flash |
| SST49LF004B-33-4C-NH | 4 Mbit LPC Firmware Flash |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| SST49LF004B_06 | 制造商:SST 制造商全稱:Silicon Storage Technology, Inc 功能描述:4 Mbit Firmware Hub |
| SST49LF004B_10 | 制造商:SST 制造商全稱:Silicon Storage Technology, Inc 功能描述:4 Mbit Firmware Hub |
| SST49LF004B-33-4C-EI | 制造商:SST 制造商全稱:Silicon Storage Technology, Inc 功能描述:4 Mbit LPC Firmware Flash |
| SST49LF004B-33-4C-EIE | 制造商:SST 制造商全稱:Silicon Storage Technology, Inc 功能描述:4 Mbit LPC Firmware Flash |
| SST49LF004B-33-4C-NH | 功能描述:閃存 512K X 8 33ns RoHS:否 制造商:ON Semiconductor 數(shù)據(jù)總線寬度:1 bit 存儲類型:Flash 存儲容量:2 MB 結構:256 K x 8 定時類型: 接口類型:SPI 訪問時間: 電源電壓-最大:3.6 V 電源電壓-最小:2.3 V 最大工作電流:15 mA 工作溫度:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體: 封裝:Reel |
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