AT25080A/160A/320A/640A - Mature

Features
• Serial Peripheral Interface (SPI) Compatible
• Supports SPI Modes 0 (0,0) and 3 (1,1)
– Data Sheet Describes Mode 0 Operation
• Medium-voltage and Standard-voltage Operation
•
•
•
•
•
•
•
– 5.0 (VCC = 4.5V to 5.5V)
– 2.7 (VCC = 2.7V to 5.5V)
5.0 MHz Clock Rate (5V)
32-byte Page Mode
Block Write Protection
– Protect 1/4, 1/2, or Entire Array
Write Protect (WP) Pin and Write Disable Instructions for both Hardware and Software
Data Protection
Self-timed Write Cycle (2 ms [5V] typical)
High Reliability
– Endurance: One Million Write Cycles
– Data Retention: 100 Years
8-lead PDIP and 8-lead JEDEC SOIC Packages
Description
The AT25080A/160A/320A/640A provides 8192/16384/32768/65536 bits of serial
electrically-erasable programmable read-only memory (EEPROM) organized as
1024/2048/4096/8192 words of 8 bits each. The device is optimized for use in many
automotive applications where low-power and low-voltage operation are essential.
The AT25080A/160A/320A/640A is available in space saving 8-lead PDIP and 8-lead
JEDEC SOIC packages.
The AT25080A/160A/320A/640A is enabled through the Chip Select pin (CS) and
accessed via a three-wire interface consisting of Serial Data Input (SI), Serial Data
Output (SO), and Serial Clock (SCK). All programming cycles are completely selftimed, and no separate erase cycle is required before write.
Block write protection is enabled by programming the status register with one of four blocks
of write protection. Separate program enable and program disable instructions are provided
for additional data protection. Hardware data protection is provided via the WP pin to protect
against inadvertent write attempts to the status register. The HOLD pin may be used to suspend any serial communication without resetting the serial sequence.
SPI Serial
Automotive
EEPROMs
8K (1024 x 8)
16K (2048 x 8)
32K (4096 x 8)
64K (8192 x 8)
AT25080A
AT25160A
AT25320A
AT25640A
Table 1. Pin Configuration
Pin Name
Function
CS
Chip Select
SCK
Serial Data Clock
SI
Serial Data Input
SO
Serial Data Output
GND
Ground
VCC
Power Supply
WP
Write Protect
HOLD
Suspends Serial Input
NC
No Connect
DC
Don’t Connect
8-lead PDIP
CS
SO
WP
GND
1
2
3
4
8
7
6
5
VCC
HOLD
SCK
SI
8-lead SOIC
CS
SO
WP
GND
1
2
3
4
8
7
6
5
VCC
HOLD
SCK
SI
3401C–SEEPR–8/04
1
Absolute Maximum Ratings*
Operating Temperature......................................−40°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 .......................................... 6.25V
*NOTICE:
Stresses beyond those listed under “Absolute
Maximum Ratings” may cause permanent damage 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.
DC Output Current........................................................ 5.0 mA
Figure 1. Block Diagram
2
AT25080A/160A/320A/640A
3401C–SEEPR–8/04
AT25080A/160A/320A/640A
Table 2. Pin Capacitance (1)
Applicable over recommended operating range from TA = 25°C, f = 1.0 MHz, VCC = +5.0V (unless otherwise noted).
Symbol
Test Conditions
Max
Units
Conditions
COUT
Output Capacitance (SO)
8
pF
VOUT = 0V
CIN
Input Capacitance (CS, SCK, SI, WP, HOLD)
6
pF
VIN = 0V
Note:
1. This parameter is characterized and is not 100% tested.
Table 3. DC Characteristics(1)
Applicable over recommended operating range from: TA = −40°C to +125°C, VCC = +2.7V to +5.5V
Symbol
Parameter
VCC1
Supply Voltage
VCC2
Supply Voltage
ICC1
Supply Current
ICC2
Test Condition
Min
Typ
Max
Units
2.7
5.5
V
4.5
5.5
V
VCC = 5.0V at 5 MHz, SO = Open, Read
6.0
mA
Supply Current
VCC = 5.0V at 1 MHz
3.0
mA
ICC3
Supply Current
VCC = 5.0V at 5 MHz, SO = Open,
Read, Write
7.0
mA
ISB1
Standby Current
VCC = 2.7V, CS = VCC
0.2
10.0(2)
µA
2.0
(2)
µA
ISB2
Standby Current
VCC = 5.0V, CS = VCC
IIL
Input Leakage
VIN = 0V to VCC
−3.0
IOL
Output Leakage
VIN = 0V to VCC
−3.0
3.0
µA
Input Low-voltage
−0.6
VCC x 0.3
V
Input High-voltage
VCC x 0.7
VCC + 0.5
V
0.4
V
VIL(1)
VIH
(1)
VOL1
Output Low-voltage
VOH1
Output High-voltage
Note:
2.7V ≤ VCC ≤ 5.5V
IOL = 3.0 mA
IOH = −1.6 mA
VCC − 0.8
13.0
µA
V
1. VIL min and VIH max are reference only and are not tested.
2. Worst case measured at 125°C
3
3401C–SEEPR–8/04
Table 4. AC Characteristics
Applicable over recommended operating range from TA = −40°C to +125°C, VCC = As Specified,
CL = 1 TTL Gate and 100 pF (unless otherwise noted).
Symbol
Parameter
Voltage
Min
Max
Units
fSCK
SCK Clock Frequency
4.5–5.5
2.7–5.5
0
0
5.0
3.0
MHz
tRI
Input Rise Time
4.5–5.5
2.7–5.5
2
2
µs
tFI
Input Fall Time
4.5–5.5
2.7–5.5
2
2
µs
tWH
SCK High Time
4.5–5.5
2.7–5.5
80
133
ns
tWL
SCK Low Time
4.5–5.5
2.7–5.5
80
133
ns
tCS
CS High Time
4.5–5.5
2.7–5.5
150
250
ns
tCSS
CS Setup Time
4.5–5.5
2.7–5.5
150
250
ns
tCSH
CS Hold Time
4.5–5.5
2.7–5.5
150
250
ns
tSU
Data In Setup Time
4.5–5.5
2.7–5.5
50
50
ns
tH
Data In Hold Time
4.5–5.5
2.7–5.5
50
50
ns
tHD
Hold Setup Time
4.5–5.5
2.7–5.5
100
100
tCD
Hold Hold Time
4.5–5.5
2.7 - 5.5
150
200
tV
Output Valid
4.5 - 5.5
2.7–5.5
0
0
tHO
Output Hold Time
4.5–5.5
2.7–5.5
0
0
tLZ
Hold to Output Low Z
4.5–5.5
2.7–5.5
0
0
tHZ
Hold to Output High Z
tDIS
ns
80
133
ns
ns
100
100
ns
4.5–5.5
2.7–5.5
100
100
ns
Output Disable Time
4.5–5.5
2.7–5.5
150
250
ns
tWC
Write Cycle Time
4.5–5.5
2.7–5.5
5
5
ms
Endurance(1)
5.0V, 25°C, Page Mode
Note:
4
1M
Write Cycles
1. This parameter is characterized and is not 100% tested.
AT25080A/160A/320A/640A
3401C–SEEPR–8/04
AT25080A/160A/320A/640A
Serial Interface
Description
MASTER: The device that generates the serial clock.
S L AV E : B e c a u s e t h e S e r i a l C l o c k p i n ( S C K ) i s a l w a y s a n i n p u t , t h e
AT25080A/160A/320A/640A always operates as a slave.
TRANSMITTER/RECEIVER: The AT25080A/160A/320A/640A has separate pins designated
for data transmission (SO) and reception (SI).
MSB: The Most Significant Bit (MSB) is the first bit transmitted and received.
SERIAL OP-CODE: After the device is selected with CS going low, the first byte will be
received. This byte contains the op-code that defines the operations to be performed.
INVALID OP-CODE: If an invalid op-code is received, no data will be shifted into the
AT25080A/160A/320A/640A, and the serial output pin (SO) will remain in a high impedance
state until the falling edge of CS is detected again. This will reinitialize the serial
communication.
CHIP SELECT: The AT25080A/160A/320A/640A is selected when the CS pin is low. When
the device is not selected, data will not be accepted via the SI pin, and the serial output pin
(SO) will remain in a high impedance state.
HOLD : The HOLD pin is used in conjunction with the CS pin to select the
AT25080A/160A/320A/640A. When the device is selected and a serial sequence is underway,
HOLD can be used to pause the serial communication with the master device without resetting
the serial sequence. To pause, the HOLD pin must be brought low while the SCK pin is low.
To resume serial communication, the HOLD pin is brought high while the SCK pin is low (SCK
may still toggle during HOLD). Inputs to the SI pin will be ignored while the SO pin is in the
high impedance state.
WRITE PROTECT: The write protect pin (WP) will allow normal read/write operations when
held high. When the WP pin is brought low and WPEN bit is “1”, all write operations to the status register are inhibited. WP going low while CS is still low will interrupt a write to the status
register. If the internal write cycle has already been initiated, WP going low will have no effect
on any write operation to the status register. The WP pin function is blocked when the WPEN
bit in th e sta tus reg is te r is "0 ". This will a llow the us er to insta ll the AT25 08 0A/
160A/320A/640A in a system with the WP pin tied to ground and still be able to write to the
status register. All WP pin functions are enabled when the WPEN bit is set to “1”.
5
3401C–SEEPR–8/04
Figure 2. SPI Serial Interface
AT25080A/160A/320A/640A
6
AT25080A/160A/320A/640A
3401C–SEEPR–8/04
AT25080A/160A/320A/640A
Functional
Description
The AT25080A/160A/320A/640A is designed to interface directly with the synchronous serial
peripheral interface (SPI) of the 6805 and 68HC11 series of microcontrollers.
The AT25080A/160A/320A/640A utilizes an 8-bit instruction register. The list of instructions
and their operation codes are contained in Table 5. All instructions, addresses, and data are
transferred with the MSB first and start with a high-to-low CS transition.
Table 5. Instruction Set for the AT25080A/160A/320A/640A
Instruction Name
Instruction Format
Operation
WREN
0000 X110
Set Write Enable Latch
WRDI
0000 X100
Reset Write Enable Latch
RDSR
0000 X101
Read Status Register
WRSR
0000 X001
Write Status Register
READ
0000 X011
Read Data from Memory Array
WRITE
0000 X010
Write Data to Memory Array
WRITE ENABLE (WREN): The device will power-up in the write disable state when V CC is
applied. All programming instructions must therefore be preceded by a Write Enable
instruction.
WRITE DISABLE (WRDI): To protect the device against inadvertent writes, the Write Disable
instruction disables all programming modes. The WRDI instruction is independent of the status of the WP pin.
READ STATUS REGISTER (RDSR): The Read Status Register instruction provides access to
the status register. The READY/BUSY and Write Enable status of the device can be determined by the RDSR instruction. Similarly, the Block Write Protection bits indicate the extent of
protection employed. These bits are set by using the WRSR instruction.
Table 6. Status Register Format
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
WPEN
X
X
X
BP1
BP0
WEN
RDY
Table 7. Read Status Register Bit Definition
Bit
Definition
Bit 0 (RDY)
Bit 0 = 0 (RDY) indicates the device is ready. Bit 0 = 1 indicates the write cycle is in
progress.
Bit 1 (WEN)
Bit 1= 0 indicates the device is not write-enabled. Bit 1 = 1 indicates the device is
write-enabled.
Bit 2 (BP0)
See Table 8 on page 8.
Bit 3 (BP1)
See Table 8 on page 8.
Bits 4–6 are “0”s when device is not in an internal write cycle.
Bit 7 (WPEN)
See Table 9 on page 8.
Bits 0–7 are “1”s during an internal write cycle.
7
3401C–SEEPR–8/04
WRITE STATUS REGISTER (WRSR): The WRSR instruction allows the user to select one of
four levels of protection. The AT25080A/160A/320A/640A is divided into four array segments.
One-quarter, one-half, or all of the memory segments can be protected. Any of the data within
any selected segment will therefore be read-only. The block write protection levels and corresponding status register control bits are shown in Table 8.
The three bits BP0, BP1, and WPEN are nonvolatile cells that have the same properties and
functions as the regular memory cells (e.g., WREN, tWC, RDSR).
Table 8. Block Write Protect Bits
Status
Register Bits
Level
0
1(1/4)
2(1/2)
3(All)
Array Addresses Protected
BP1
BP0
AT25080A
AT25160A
AT25320A
AT25640A
0
0
None
None
None
None
0
1
0300
−03FF
0600
−07FF
0C00
−0FFF
1800
−1FFF
1
0
0200
−03FF
0400
−07FF
0800
−0FFF
1000
−1FFF
1
1
0000
−03FF
0000
−07FF
0000
−0FFF
0000
−1FFF
The WRSR instruction also allows the user to enable or disable the write protect (WP) pin
through the use of the Write Protect Enable (WPEN) bit. Hardware write protection is enabled
when the WP pin is low and the WPEN bit is “1”. Hardware write protection is disabled when
either the WP pin is high or the WPEN bit is “0”. When the device is hardware write-protected,
writes to the status register, including the block protect bits and the WPEN bit, and the blockprotected sections in the memory array are disabled. Writes are only allowed to sections of the
memory that are not block-protected.
NOTE: When the WPEN bit is hardware write-protected, it cannot be changed back to “0” as
long as the WP pin is held low.
Table 9. WPEN Operation
8
WPEN
WP
WEN
Protected
Blocks
Unprotected
Blocks
Status
Register
0
X
0
Protected
Protected
Protected
0
X
1
Protected
Writable
Writable
1
Low
0
Protected
Protected
Protected
1
Low
1
Protected
Writable
Protected
X
High
0
Protected
Protected
Protected
X
High
1
Protected
Writable
Writable
AT25080A/160A/320A/640A
3401C–SEEPR–8/04
AT25080A/160A/320A/640A
READ SEQUENCE (READ): Reading the AT25080A/160A/320A/640A via the serial output
(SO) pin requires the following sequence. After the CS line is pulled low to select a device, the
READ op-code is transmitted via the SI line followed by the byte address to be read (A15–A0;
see Table 10). Upon completion, any data on the SI line will be ignored. The data (D7–D0) at
the specified address is then shifted out onto the SO line. If only one byte is to be read, the CS
line should be driven high after the data comes out. The read sequence can be continued
since the byte address is automatically incremented and data will continue to be shifted out.
When the highest address is reached, the address counter will roll over to the lowest address,
allowing the entire memory to be read in one continuous read cycle.
WRITE SEQUENCE (WRITE): In order to program the AT25080A/160A/320A/640A, two separate instructions must be executed. First, the device must be write-enabled via the WREN
instruction. Then a write (WRITE) instruction may be executed. Also, the address of the memory location(s) to be programmed must be outside the protected address field location
selected by the block write protection level. During an internal write cycle, all commands will
be ignored except the RDSR instruction.
A write instruction requires the following sequence. After the CS line is pulled low to select the
device, the WRITE op-code is trans‘mitted via the SI line followed by the byte address (A15–
A0) and the data (D7–D0) to be programmed (see Table 10). Programming will start after the
CS pin is brought high. The low-to-high transition of the CS pin must occur during the SCK
low-time immediately after clocking in the D0 (LSB) data bit.
The READY/BUSY status of the device can be determined by initiating a read status register
(RDSR) instruction. If Bit 0 = 1, the write cycle is still in progress. If Bit 0 = 0, the write cycle
has ended. Only the RDSR instruction is enabled during the write programming cycle.
The AT25080A/160A/320A/640A is capable of a 32-byte page write operation. After each byte
of data is received, the five low-order address bits are internally incremented by one; the highorder bits of the address will remain constant. If more than 32 bytes of data are transmitted,
the address counter will roll over and the previously written data will be overwritten. The
AT25080A/160A/320A/640A is automatically returned to the write disable state at the completion of a write cycle.
NOTE: If the device is not write-enabled (WREN), the device will ignore the write instruction
and will return to the standby state when CS is brought high. A new CS falling edge is required
to reinitiate the serial communication.
Table 10. Address Key
Address
AT25080A
AT25160A
AT25320A
AT25640A
AN
A9–A0
A10–A0
A11–A0
A12–A0
Don’t
Care Bits
A15–A10
A15–A11
A15–A12
A15–A13
9
3401C–SEEPR–8/04
Timing Diagrams
Figure 3. Synchronous Data Timing (for Mode 0)
t CS
VIH
CS
VIL
t CSH
t CSS
VIH
t WH
SCK
t WL
VIL
tH
t SU
VIH
SI
VALID IN
VIL
tV
VOH
SO
HI-Z
t HO
t DIS
HI-Z
VOL
Figure 4. WREN Timing
Figure 5. WRDI Timing
10
AT25080A/160A/320A/640A
3401C–SEEPR–8/04
AT25080A/160A/320A/640A
Figure 6. RDSR Timing
CS
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
3
2
1
0
12
13
14
15
2
1
0
SCK
INSTRUCTION
SI
SO
DATA OUT
HIGH IMPEDANCE
7
6
5
4
MSB
Figure 7. WRSR Timing
CS
0
1
2
3
4
5
6
7
8
9
10
11
7
6
5
4
SCK
DATA IN
SI
INSTRUCTION
3
HIGH IMPEDANCE
SO
11
3401C–SEEPR–8/04
Figure 8. READ Timing
CS
0
1
2
3
4
5
6
7
8
9 10 11 20 21 22 23 24 25 26 27 28 29 30 31
SCK
BYTE ADDRESS
15 14 13 ...
INSTRUCTION
SI
3
2
1
0
DATA OUT
HIGH IMPEDANCE
7
SO
6
5
4
3
2
1
0
MSB
Figure 9. WRITE Timing
CS
0
1
2
3
4
5
6
7
8
9 10 11 20 21 22 23 24 25 26 27 28 29 30 31
SCK
SI
SO
BYTE ADDRESS
15 14 13 ... 3 2 1
INSTRUCTION
DATA IN
0
7
6
5
4
3
2
1
0
HIGH IMPEDANCE
Figure 10. HOLD Timing
CS
tCD
tCD
SCK
t HD
t HD
HO LD
t HZ
SO
t LZ
12
AT25080A/160A/320A/640A
3401C–SEEPR–8/04
AT25080A/160A/320A/640A
AT25080A Ordering Information
Ordering Code
Package
Operation Range
AT25080A-10PA-5.0C
AT25080AN-10SA-5.0C
8P3
8S1
Automotive
(−40°C to 125°C)
AT25080A-10PA-2.7C
AT25080AN-10SA-2.7C
8P3
8S1
Automotive
(−40°C to 125°C)
Package Type
8P3
8-lead, 0.300" Wide, Plastic Dual Inline Package (PDIP)
8S1
8-lead, 0.150" Wide, Plastic Gull Wing Small Outline (JEDEC SOIC)
Options
−5.0
Standard Device (4.5V to 5.5V)
−2.7
Low Voltage (2.7V to 5.5V)
13
3401C–SEEPR–8/04
AT25160A Ordering Information
Ordering Code
Package
Operation Range
AT25160A-10PA-5.0C
AT25160AN-10SA-5.0C
8P3
8S1
Automotive
(−40°C to 125°C)
AT25160A-10PA-2.7C
AT25160AN-10SA-2.7C
8P3
8S1
Automotive
(−40°C to 125°C)
Package Type
8P3
8-lead, 0.300" Wide, Plastic Dual Inline Package (PDIP)
8S1
8-lead, 0.150" Wide, Plastic Gull Wing Small Outline (JEDEC SOIC)
Options
−5.0
Standard Device (4.5V to 5.5V)
−2.7
Low Voltage (2.7V to 5.5V)
14
AT25080A/160A/320A/640A
3401C–SEEPR–8/04
AT25080A/160A/320A/640A
AT25320A Ordering Information
Ordering Code
Package
Operation Range
AT25320A-10PA-5.0C
AT25320AN-10SA-5.0C
8P3
8S1
Automotive
(−40°C to 125°C)
AT25320A-10PA-2.7C
AT25320AN-10SA-2.7C
8P3
8S1
Automotive
(−40°C to 125°C)
Package Type
8P3
8-lead, 0.300" Wide, Plastic Dual Inline Package (PDIP)
8S1
8-lead, 0.150" Wide, Plastic Gull Wing Small Outline (JEDEC SOIC)
Options
−5.0
Standard Device (4.5V to 5.5V)
−2.7
Low Voltage (2.7V to 5.5V)
15
3401C–SEEPR–8/04
AT25640A Ordering Information
Ordering Code
Package
Operation Range
AT25640A-10PA-5.0C
AT25640AN-10SA-5.0C
8P3
8S1
Automotive
(−40°C to 125°C)
AT25640A-10PA-2.7C
AT25640AN-10SA-2.7C
8P3
8S1
Automotive
(−40°C to 125°C)
Package Type
8P3
8-lead, 0.300" Wide, Plastic Dual Inline Package (PDIP)
8S1
8-lead, 0.150" Wide, Plastic Gull Wing Small Outline (JEDEC SOIC)
Options
−5.0
Standard Device (4.5V to 5.5V)
−2.7
Low Voltage (2.7V to 5.5V)
16
AT25080A/160A/320A/640A
3401C–SEEPR–8/04
AT25080A/160A/320A/640A
Packaging Information
8P3 – PDIP
E
1
E1
N
Top View
c
eA
End View
COMMON DIMENSIONS
(Unit of Measure = inches)
D
e
D1
A2 A
b2
b3
b
4 PLCS
Side View
L
SYMBOL
NOM
MAX
NOTE
2
A
–
–
0.210
A2
0.115
0.130
0.195
b
0.014
0.018
0.022
5
b2
0.045
0.060
0.070
6
b3
0.030
0.039
0.045
6
c
0.008
0.010
0.014
D
0.355
0.365
0.400
3
D1
0.005
–
–
3
E
0.300
0.310
0.325
4
E1
0.240
0.250
0.280
3
e
0.100 BSC
eA
0.300 BSC
L
Notes:
MIN
0.115
0.130
4
0.150
2
1. This drawing is for general information only; refer to JEDEC Drawing MS-001, Variation BA, for additional information.
2. Dimensions A and L are measured with the package seated in JEDEC seating plane Gauge GS-3.
3. D, D1 and E1 dimensions do not include mold Flash or protrusions. Mold Flash or protrusions shall not exceed 0.010 inch.
4. E and eA measured with the leads constrained to be perpendicular to datum.
5. Pointed or rounded lead tips are preferred to ease insertion.
6. b2 and b3 maximum dimensions do not include Dambar protrusions. Dambar protrusions shall not exceed 0.010 (0.25 mm).
01/09/02
R
2325 Orchard Parkway
San Jose, CA 95131
TITLE
8P3, 8-lead, 0.300" Wide Body, Plastic Dual
In-line Package (PDIP)
DRAWING NO.
REV.
8P3
B
17
3401C–SEEPR–8/04
8S1 – JEDEC SOIC
C
1
E
E1
L
N
∅
Top View
End View
e
B
COMMON DIMENSIONS
(Unit of Measure = mm)
A
SYMBOL
A1
D
Side View
MIN
NOM
MAX
A
1.35
–
1.75
A1
0.10
–
0.25
b
0.31
–
0.51
C
0.17
–
0.25
D
4.80
–
5.00
E1
3.81
–
3.99
E
5.79
–
6.20
e
NOTE
1.27 BSC
L
0.40
–
1.27
∅
0°
–
8°
Note: These drawings are for general information only. Refer to JEDEC Drawing MS-012, Variation AA for proper dimensions, tolerances, datums, etc.
10/7/03
R
18
1150 E. Cheyenne Mtn. Blvd.
Colorado Springs, CO 80906
TITLE
8S1, 8-lead (0.150" Wide Body), Plastic Gull Wing
Small Outline (JEDEC SOIC)
DRAWING NO.
8S1
REV.
B
AT25080A/160A/320A/640A
3401C–SEEPR–8/04
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3401C–SEEPR–8/04
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