AT49LV2048-12TC [ATMEL]
Flash, 128KX16, 120ns, PDSO48, PLASTIC, MO-142DD, TSOP-48;型号: | AT49LV2048-12TC |
厂家: | ATMEL |
描述: | Flash, 128KX16, 120ns, PDSO48, PLASTIC, MO-142DD, TSOP-48 光电二极管 |
文件: | 总13页 (文件大小:560K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
Features
• Low Voltage Operation
– 2.7V Read
– 5V Program/Erase
• Fast Read Access Time - 120 ns
• Internal Erase/Program Control
• Sector Architecture
– One 8K Words (16K bytes) Boot Block with Programming Lockout
– Two 8K Words (16K bytes) Parameter Blocks
– One 104K Words (208K bytes) Main Memory Array Block
• Fast Sector Erase Time - 10 seconds
• Word-By-Word Programming - 10 µs/Word
• Hardware Data Protection
• DATA Polling For End Of Program Detection
• Low Power Dissipation
– 25 mA Active Current
– 50 µA CMOS Standby Current
• Typical 10,000 Write Cycles
2-Megabit
(128K x 16)
3-volt Only
Flash Memory
Description
The AT49BV2048 and AT49LV2048 are 3-volt, 2-megabit Flash Memories organized
as 128K words of 16 bits each. Manufactured with Atmel’s advanced nonvolatile
CMOS technology, the devices offer access times to 120 ns with power dissipation of
just 67 mW at 2.7V read. When deselected, the CMOS standby current is less than 50 µA.
(continued)
AT49BV2048
AT49LV2048
Not Recommended
for New Design
Contact Atmel to discuss
the latest design in trends
and options
Pin Configurations
Pin Name
A0 - A16
CE
Function
Addresses
Chip Enable
OE
Output Enable
Write Enable
Reset
WE
RESET
VPP
Program/Erase Power Supply
Data Inputs/Outputs
No Connect
TSOP Top View
I/O0 - I/O15
NC
Type1
A15
A14
A13
A12
A11
A10
A9
1
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
A16
2
NC
SOIC (SOP)
3
GND
I/O15
I/O7
I/O14
I/O6
I/O13
I/O5
I/O12
I/O4
VCC
I/O11
I/O3
I/O10
I/O2
I/O9
I/O1
I/O8
I/O0
OE
4
VPP
1
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
RESET
WE
5
NC
NC
2
6
3
A8
7
A7
4
A9
A8
8
A6
5
A10
A11
A12
A13
A14
A15
A16
NC
NC
9
A5
6
NC
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
A4
7
WE
RESET
VPP
NC
A3
8
A2
9
A1
10
11
12
13
14
15
16
17
18
19
20
21
22
NC
A0
NC
CE
NC
GND
OE
GND
I/O15
I/O7
I/O14
I/O6
I/O13
I/O5
I/O12
I/O4
VCC
A7
A6
I/O0
I/O8
I/O1
I/O9
I/O2
I/O10
I/O3
I/O11
A5
A4
A3
GND
CE
A2
Rev. 0853C–12/98
A1
A0
To allow for simple in-system reprogrammability, the
AT49BV2048/LV2048 does not require high input voltages
for programming. Reading data out of the device is similar
to reading from an EPROM; it has standard CE, OE, and
WE inputs to avoid bus contention. Reprogramming the
AT49BV2048/LV2048 is performed by first erasing a block
of data and then programming on a word-by-word basis.
The device has the capability to protect the data in the boot
block; this feature is enabled by a command sequence.
Once the boot block programming lockout feature is
enabled, the data in the boot block cannot be changed
when input levels of 3.6 volts or less are used. The typical
number of program and erase cycles is in excess of 10,000
cycles.
The device is erased by executing the erase command
sequence; the device internally controls the erase opera-
tion. The memory is divided into three blocks for erase
operations. There are two 8K word parameter block sec-
tions and one sector consisting of the boot block and the
main memory array block. The AT49BV2048/LV2048 is
programmed on a word-by-word basis.
The optional 8K word boot block section includes a repro-
gramming lock out feature to provide data integrity. The
boot sector is designed to contain user secure code, and
when the feature is enabled, the boot sector is protected
from being reprogrammed.
During a chip erase, sector erase, or word programming,
the VPP pin must be at 5V ± 10%.
Block Diagram
Device Operation
READ: The AT49BV2048/LV2048 is accessed like an
EPROM. When CE and OE are low and WE is high, the
data stored at the memory location determined by the
address pins is asserted on the outputs. The outputs are
put in the high impedance state whenever CE or OE is
high. This dual-line control gives designers flexibility in pre-
venting bus contention.
edge of CE or WE, whichever occurs last. The data is
latched by the first rising edge of CE or WE. Standard
microprocessor write timings are used. The address loca-
tions used in the command sequences are not affected by
entering the command sequences.
RESET: A RESET input pin is provided to ease some sys-
tem applications. When RESET is at a logic high level, the
device is in its standard operating mode. A low level on the
RESET input halts the present device operation and puts
the outputs of the device in a high impedance state. When
a high level is reasserted on the RESET pin, the device
returns to the Read or Standby mode, depending upon the
state of the control inputs. By applying a 12V ± 0.5V input
signal to the RESET pin the boot block array can be repro-
grammed even if the boot block program lockout feature
has been enabled (see Boot Block Programming Lockout
Override section).
COMMAND SEQUENCES: When the device is first pow-
ered on it will be reset to the read or standby mode
depending upon the state of the control line inputs. In order
to perform other device functions, a series of command
sequences are entered into the device. The command
sequences are shown in the Command Definitions table
(I/O8 - I/O15 are don't care inputs for the command codes).
The command sequences are written by applying a low
pulse on the WE or CE input with CE or WE low (respec-
tively) and OE high. The address is latched on the falling
AT49BV/LV2048
2
AT49BV/LV2048
ERASURE: Before a word can be reprogrammed, it must
be erased. The erased state of memory bits is a logical “1”.
The entire device can be erased by using the Chip Erase
command or individual sectors can be erased by using the
Sector Erase commands.
boot block, can contain secure code that is used to bring up
the system. Enabling the lockout feature will allow the boot
code to stay in the device while data in the rest of the
device is updated. This feature does not have to be acti-
vated; the boot block's usage as a write protected region is
optional to the user. The address range of the boot block is
00000H to 01FFFH.
CHIP ERASE: The entire device can be erased at one time
by using the 6-byte chip erase software code. After the chip
erase has been initiated, the device will internally time the
erase operation so that no external clocks are required.
Once the feature is enabled, the data in the boot block can
no longer be erased or programmed when input levels of
5.5V or less are used. Data in the main memory block can
still be changed through the regular programming method.
To activate the lockout feature, a series of six program
commands to specific addresses with specific data must be
performed. Please refer to the Command Definitions table.
The maximum time to erase the chip is tEC
.
If the boot block lockout has been enabled, the Chip Erase
will not erase the data in the boot block; it will erase the
main memory block and the parameter blocks only. After
the chip erase, the device will return to the read or standby
mode.
BOOT BLOCK LOCKOUT DETECTION: A software
method is available to determine if programming of the boot
block section is locked out. When the device is in the soft-
ware product identification mode (see Software Product
Identification Entry and Exit sections) a read from address
location 00002H will show if programming the boot block is
locked out. If the data on I/O0 is low, the boot block can be
programmed; if the data on I/O0 is high, the program lock-
out feature has been enabled and the block cannot be pro-
grammed. The software product identification exit code
should be used to return to standard operation.
SECTOR ERASE: As an alternative to a full chip erase, the
device is organized into three sectors that can be individu-
ally erased. There are two 8K word parameter block sec-
tions and one sector consisting of the boot block and the
main memory array block. The Sector Erase command is a
six bus cycle operation. The sector address is latched on
the falling WE edge of the sixth cycle while the 30H data
input command is latched at the rising edge of WE. The
sector erase starts after the rising edge of WE of the sixth
cycle. The erase operation is internally controlled; it will
automatically time to completion. When the boot block pro-
gramming lockout feature is not enabled, the boot block
and the main memory block will erase together (from the
same sector erase command). Once the boot region has
been protected, only the main memory array sector will
erase when its sector erase command is issued. Whenever
a parameter block is erased and reprogrammed, the other
parameter block should be erased and reprogrammed
before the first parameter block is erased again.
BOOT BLOCK PROGRAMMING LOCKOUT OVERRIDE:
The user can override the boot block programming lockout
by taking the RESET pin to 12 ± 0.5 volts. By doing this
protected boot block data can be altered through a chip
erase, sector erase or word programming. When the
RESET pin is brought back to TTL levels the boot block
programming lockout feature is again active.
PRODUCT IDENTIFICATION: The product identification
mode identifies the device and manufacturer as Atmel. It
may be accessed by hardware or software operation. The
hardware operation mode can be used by an external pro-
grammer to identify the correct programming algorithm for
the Atmel product.
WORD PROGRAMMING: Once a memory block is erased,
it is programmed (to a logical “0”) on a word-by-word basis.
Programming is accomplished via the internal device com-
mand register and is a 4 bus cycle operation. The device
will automatically generate the required internal program
pulses.
For details, see Operating Modes (for hardware operation)
or Software Product Identification. The manufacturer and
device code is the same for both modes.
Any commands written to the chip during the embedded
programming cycle will be ignored. If a hardware reset hap-
pens during programming, the data at the location being
programmed will be corrupted. Please note that a data “0”
cannot be programmed back to a “1”; only erase operations
can convert “0”s to “1”s. Programming is completed after
the specified tBP cycle time. The DATA polling feature may
also be used to indicate the end of a program cycle.
DATA POLLING: The AT49BV2048/LV2048 features DATA
polling to indicate the end of a program cycle. During a pro-
gram cycle an attempted read of the last byte loaded will
result in the complement of the loaded data on I/O7. Once
the program cycle has been completed, true data is valid
on all outputs and the next cycle may begin. During a chip
or sector erase operation, an attempt to read the device will
give a “0” on I/O7. Once the program or erase cycle has
completed, true data will be read from the device. DATA
polling may begin at any time during the program cycle.
BOOT BLOCK PROGRAMMING LOCKOUT: The device
has one designated block that has a programming lockout
feature. This feature prevents programming of data in the
designated block once the feature has been enabled. The
size of the block is 8K words. This block, referred to as the
TOGGLE B IT: In addition to DATA polling the
AT49BV2048/LV2048 provides another method for deter-
3
mining the end of a program or erase cycle. During a pro-
gram or erase operation, successive attempts to read data
from the device will result in I/O6 toggling between one and
zero. Once the program cycle has completed, I/O6 will stop
toggling and valid data will be read. Examining the toggle
bit may begin at any time during a program cycle.
VCC sense level, the device will automatically time out 10
ms (typical) before programming. (c) Program inhibit: hold-
ing any one of OE low, CE high or WE high inhibits pro-
gram cycles. (d) Noise filter: pulses of less than 15 ns
(typical) on the WE or CE inputs will not initiate a program
cycle.
HARDWARE DATA PROTECTION: Hardware features
protect against inadvertent programs to the
AT49BV2048/LV2048 in the following ways: (a) VCC sense:
if VCC is below 1.8V (typical), the program function is inhib-
ited. (b) VCC power on delay: once VCC has reached the
INPUT LEVELS: While operating with a 2.7V to 3.6V
power supply, the address inputs and control inputs (OE,
CE, and WE) may be driven from 0 to 5.5V without
adversely affecting the operation of the device. The I/O
lines can only be driven from 0 to VCC + 0.6V.
Command Definition (in Hex)(1)
1st Bus
Cycle
2nd Bus
Cycle
3rd Bus
Cycle
4th Bus
Cycle
5th Bus
Cycle
6th Bus
Cycle
Command
Sequence
Bus
Cycles
Addr
Data
DOUT
AA
Addr
Data
Addr
Data
Addr
Data
Addr
Data
Addr
Data
Read
1
6
6
4
6
3
3
1
Addr
5555
5555
5555
5555
5555
5555
xxxx
Chip Erase
2AAA
2AAA
2AAA
2AAA
2AAA
2AAA
55
55
55
55
55
55
5555
5555
5555
5555
5555
5555
80
80
A0
80
90
F0
5555
5555
Addr
5555
AA
AA
DIN
AA
2AAA
2AAA
55
55
5555
10
30
Sector Erase
AA
SA(4)(5)
Word Program
Boot Block Lockout(2)
Product ID Entry
Product ID Exit(3)
Product ID Exit(3)
AA
AA
2AAA
55
5555
40
AA
AA
F0
Notes: 1. The Data Format in each bus cycle is as follows:
I/O15 - I/O8 (Don’t care); I/O7 - I/O0 (Hex)
2. The 8K word boot sector has the address range 00000H to 01FFFH.
3. Either one of the product ID Exit commands can be used.
4. SA = sector addresses:
SA = 03XXX for PARAMETER BLOCK 1
SA = 05XXX for PARAMETER BLOCK 2
SA = 1FXXX for MAIN MEMORY ARRAY
5. When the boot block programming lockout feature is not enabled, the boot block and the main memory block will erase.
Absolute Maximum Ratings*
*NOTICE:
Stresses beyond those listed under “Absolute
Maximum Ratings” may cause permanent dam-
age to the device. This is a stress rating only and
functional operation of the device at these or any
other conditions beyond those indicated in the
operational sections of this specification is not
implied. Exposure to absolute maximum rating
conditions for extended periods may affect device
reliability.
Operating Temperature ................................. -55°C to +125°C
Storage Temperature..................................... -65°C to +150°C
Voltage on Any Pin
with Respect to Ground.....................................-1.0V to +7.0V
Maximum Operating Voltage............................................. 6.6V
DC Output Current...................................................... 25.0 mA
AT49BV/LV2048
4
AT49BV/LV2048
DC and AC Operating Range
AT49LV2048-12
0°C - 70°C
-40°C - 85°C
3.0V to 3.6V°
N/A
AT49BV/LV2048-15
AT49BV/LV2048-20
0°C - 70°C
Com.
0°C - 70°C
-40°C - 85°C
3.0V to 3.6V
2.7V to 3.6V
Operating
Temperature (Case)
Ind.
-40°C - 85°C
3.0V to 3.6V
AT49LV2048
VCC Power Supply
AT49BV2048
2.7V to 3.6V
Operating Modes
Mode
CE
VIL
VIL
VIH
X
OE
WE
RESET
VIH
VPP
Ai
Ai
Ai
X
I/O
Read
VIL
VIH
X(1)
X
VIH
VIL
X
X
DOUT
DIN
Program/Erase(2)
Standby/Program Inhibit
Program Inhibit
Program Inhibit
Output Disable
Reset
VIH
5V ± 10%
VIH
X
VIL
VIL
X
High Z
VIH
X
VIH
X
VIL
VIH
X
VIH
X
X
VIH
High Z
High Z
X
X
VIL
X
X
Product Identification
A1 - A16 = VIL, A9 = VH,(3)
A0 = VIL
VIL
VIL
VIH
VIH
Manufacturer Code(4)
Device Code(4)
Hardware
A1 - A16 = VIL, A9 = VH,(3)
A0 = VIH
Software(5)
VIH
A0 = VIL, A1 - A16 = VIL
A0 = VIH, A1 - A16 = VIL
Manufacturer Code(4)
Device Code(4)
Notes: 1. X can be VIL or VIH.
2. Refer to AC Programming Waveforms.
3. VH = 12.0V ± 0.5V.
4. Manufacturing Code: 1FH, Device Code: 82H
5. See details under Software Product Identification Entry/Exit.
DC Characteristics
Symbol
Parameter
Condition
Min
Max
10
10
50
1
Units
µA
µA
µA
mA
mA
V
ILI
Input Load Current
Output Leakage Current
VCC Standby Current CMOS
VCC Standby Current TTL
VCC Active Current
Input Low Voltage
VIN = 0V to VCC
ILO
VI/O = 0V to VCC
ISB1
CE = VCC - 0.3V to VCC
CE = 2.0V to VCC
f = 5 MHz; IOUT = 0 mA
ISB2
(1)
ICC
25
0.8
VIL
VIH
VOL
VOH
Input High Voltage
2.0
2.4
V
Output Low Voltage
IOL = 2.1 mA
IOH = -400 µA
0.45
V
Output High Voltage
V
Note:
1. In the erase mode, ICC is 50 mA.
5
AC Read Characteristics
AT49LV2048-12
AT49BV/LV2048-15
AT49BV/LV2048-20
Symbol
Parameter
Min
Max
120
120
50
Min
Max
150
150
100
50
Min
Max
200
200
100
50
Units
ns
tACC
Address to Output Delay
CE to Output Delay
OE to Output Delay
CE or OE to Output Float
(1)
tCE
ns
(2)
tOE
0
0
0
0
0
0
ns
(3)(4)
tDF
30
ns
Output Hold from OE,
CE or Address,
tOH
0
0
0
ns
whichever occurred first
AC Read Waveforms (1)(2)(3)(4)
Notes: 1. CE may be delayed up to tACC - tCE after the address transition without impact on tACC
2. OE may be delayed up to tCE - tOE after the falling edge of CE without impact on tCE or by tACC - tOE after an address change
without impact on tACC
.
.
3. tDF is specified from OE or CE whichever occurs first (CL = 5 pF).
4. This parameter is characterized and is not 100% tested.
Input Test Waveforms and
Measurement Level
Output Test Load
Pin Capacitance(1)
(f = 1 MHz, T = 25°C)
Symbol
CIN
Typ
4
Max
6
Units
pF
Conditions
VIN = 0V
COUT
8
12
pF
VOUT = 0V
Note:
1. This parameter is characterized and is not 100% tested.
AT49BV/LV2048
6
AT49BV/LV2048
AC Word Load Characteristics
Symbol
Parameter
Min
10
Max
Units
ns
t
AS, tOES
Address, OE Set-up Time
Address Hold Time
tAH
tCS
tCH
tWP
tDS
100
0
ns
Chip Select Set-up Time
Chip Select Hold Time
Write Pulse Width (WE or CE)
Data Set-up Time
ns
0
ns
200
100
10
ns
ns
t
DH, tOEH
Data, OE Hold Time
Write Pulse Width High
ns
tWPH
200
ns
AC Word Load Waveforms
WE Controlled
CE Controlled
7
Program Cycle Characteristics
Symbol
Parameter
Min
Typ
Max
Units
µs
tBP
Word Programming Time
Address Set-up Time
Address Hold Time
Data Set-up Time
Data Hold Time
30
50
tAS
0
ns
tAH
100
100
0
ns
tDS
ns
tDH
ns
tWP
Write Pulse Width
Write Pulse Width High
Erase Cycle Time
200
200
ns
tWPH
tEC
ns
10
seconds
Program Cycle Waveforms
Sector or Chip Erase Cycle Waveforms
Notes: 1. OE must be high only when WE and CE are both low.
2. For chip erase, the address should be 5555H. For sector erase, the address depends on what sector is to be erased. (See
note 4 under command definitions.)
3. For chip erase, the data should be 10H, and for sector erase, the data should be 30H.
AT49BV/LV2048
8
AT49BV/LV2048
Data Polling Characteristics(1)
Symbol
Parameter
Min
10
Typ
Max
Units
ns
tDH
Data Hold Time
tOEH
tOE
OE Hold Time
10
ns
OE to Output Delay(2)
Write Recovery Time
ns
tWR
0
ns
Notes: 1. These parameters are characterized and not 100% tested.
2. See tOE spec in AC Read Characteristics.
Data Polling Waveforms
Toggle Bit Characteristics(1)
Symbol
Parameter
Min
10
Typ
Max
Units
ns
tDH
Data Hold Time
OE Hold Time
tOEH
tOE
tOEHP
tWR
10
ns
OE to Output Delay(2)
ns
OE High Pulse
150
0
ns
Write Recovery Time
ns
Notes: 1. These parameters are characterized and not 100% tested.
2. See tOE spec in AC Read Characteristics.
Toggle Bit Waveforms (1)(2)(3)
Notes: 1. Toggling either OE or CE or both OE and CE will operate toggle bit. The tOEHP specification must be met by the toggling
input(s).
2. Beginning and ending state of I/O6 will vary.
3. Any address location may be used but the address should not vary.
9
Software Product Identification Entry(1) Boot Block Lockout Enable
Algorithm(1)
LOAD DATA AA
TO
LOAD DATA AA
ADDRESS 5555
TO
ADDRESS 5555
LOAD DATA 55
TO
LOAD DATA 55
TO
ADDRESS 2AAA
ADDRESS 2AAA
LOAD DATA 90
TO
LOAD DATA 80
TO
ADDRESS 5555
ADDRESS 5555
LOAD DATA AA
TO
ENTER PRODUCT
IDENTIFICATION
(2)(3)(5)
ADDRESS 5555
MODE
Software Product Identification Exit(1)(6)
LOAD DATA 55
TO
OR
LOAD DATA AA
LOAD DATA F0
ADDRESS 2AAA
TO
TO
ADDRESS 5555
ANY ADDRESS
LOAD DATA 40
TO
EXIT PRODUCT
IDENTIFICATION
ADDRESS 5555
LOAD DATA 55
TO
(4)
MODE
ADDRESS 2AAA
PAUSE 1 second(2)
LOAD DATA F0
TO
ADDRESS 5555
Notes for boot block lockout feature enable:
1. Data Format: I/O15 - I/O8 (Don’t Care); I/O7 - I/O0
(Hex)
EXIT PRODUCT
IDENTIFICATION
Address Format: A14 - A0 (Hex).
(4)
MODE
2. Boot block lockout feature enabled.
Notes for software product identification:
1. Data Format: I/O15 - I/O8 (Don’t Care); I/O7 - I/O0
(Hex)
Address Format: A14 - A0 (Hex).
2. A1 - A16 = VIL.
Manufacture Code is read for A0 = VIL;
Device Code is read for A0 = VIH
3. The device does not remain in identification mode if
powered down.
4. The device returns to standard operation mode.
5. Manufacturer Code: 1FH
Device Code: 82H
6. Either one of the Product ID Exit commands can be
used.
AT49BV/LV2048
10
AT49BV/LV2048
Ordering Information(1)
I
CC (mA)
tACC
(ns)
Active
Standby
Ordering Code
Package
Operation Range
120
150
200
150
200
25
0.05
AT49LV2048-12RC
AT49LV2048-12TC
44R
48T
Commercial
(0° to 70°C)
AT49LV2048-12RI
AT49LV2048-12TI
44R
48T
Industrial
(-40° to 85°C)
25
25
25
25
0.05
0.05
0.05
0.05
AT49LV2048-15RC
AT49LV2048-15TC
44R
48T
Commercial
(0° to 70°C)
AT49LV2048-15RI
AT49LV2048-15TI
44R
48T
Industrial
(-40° to 85°C)
AT49LV2048-20RC
AT49LV2048-20TC
44R
48T
Commercial
(0° to 70°C)
AT49LV2048-20RI
AT49LV2048-20TI
44R
48T
Industrial
(-40° to 85°C)
AT49BV2048-15RC
AT49BV2048-15TC
44R
48T
Commercial
(0° to 70°C)
AT49BV2048-15RI
AT49BV2048-15TI
44R
48T
Industrial
(-40° to 85°C)
AT49BV2048-20RC
AT49BV2048-20TC
44R
48T
Commercial
(0° to 70°C)
AT49BV2048-20RI
AT49BV2048-20TI
44R
48T
Industrial
(-40° to 85°C)
Note:
1. The AT49BV2048/LV2048 has an optional boot block feature. The part number shown in the Ordering Information table is for
devices with the boot block in the lower address range (i.e., 00000H to 01FFFH). Users requiring the boot block to be in the
higher address range should contact Atmel.
Package Type
44-Lead, 0.525" Wide, Plastic Gull Wing Small Outline Package (SOIC/SOP)
48-Lead, Thin Small Outline Package (TSOP)
44R
48T
11
Packaging Information
44R, 44-Lead, 0.525" Wide
Plastic Gull Wing Small Outline (SOIC)
48T, 48-Lead, Plastic Thin Small Outline Package
(TSOP)
Dimensions in Inches and (Millimeters)
Dimensions in Millimeters and (Inches)*
JEDEC OUTLINE MO-142 DD
*Controlling dimension: millimeters
AT49BV/LV2048
12
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© Atmel Corporation 1998.
Atmel Corporation makes no warranty for the use of its products, other than those expressly contained in the Company’s standard war-
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