Atmel AT24CS04 and AT24CS08
I
2
C-Compatible (2-wire) Serial EEPROM with a
Unique, Factory Programmed 128-bit Serial Number
4-Kbit (512 x 8), 8-Kbit (1024 x 8)
PRELIMINARY DATASHEET
Standard Features
Low-voltage operation
V
CC
= 1.7V to 5.5V
Internally organized as 512 x 8 (4-Kbit) or 1024 x 8 (8-Kbit)
I
2
C-compatible (2-wire) serial interface
Schmitt Trigger, filtered inputs for noise suppression
Bidirectional data transfer protocol
400kHz (1.7V) and 1MHz (2.5V, 2.7, 5.0V) compatibility
Write Protect pin for hardware data protection
16-byte page write mode
Partial page writes allowed
Self-timed write cycle (5ms max)
High-reliability
Endurance: 1,000,000 write cycles
Data retention: 100 years
Green package options (Pb/Halide-free/RoHS-compliant)
8-lead JEDEC SOIC, 8-lead TSSOP, 8-pad UDFN, and 5-lead SOT23
Die sale options: wafer form and tape and reel available
Enhanced Features in the CS Serial EEPROM Series
All standard features supported
128-bit unique factory-programmed serial number
Permanently locked, read-only value
Stored in a separate memory area
Guaranteed unique across entire CS Series of Serial EEPROMs
8766B–SEEPR–8/12
1.
Description
The Atmel
®
AT24CS04 and AT24CS08 provides 4096/8192 bits of Serial Electrically Erasable and Programmable
Read-only Memory (EEPROM) organized as 512/1024 words of eight bits each. The device is optimized for use in many
industrial and commercial applications where low-power and low-voltage operation are essential. The AT24CS04/08 is
available in space-saving, 8-lead JEDEC SOIC, 8-lead TSSOP, 8-pad UDFN and 5-lead SOT23 packages and is
accessed via a 2-wire serial interface. In addition, both devices fully operate from 1.7V to 5.5V V
CC
.
The AT24CS04/08 provides the additional feature of a factory programmed, guaranteed unique 128-bit serial number,
while maintaining all of the traditional features available in the 4-Kbit or 8-Kbit Serial EEPROM. The time consuming step
of performing and ensuring true serialization of product on a manufacturing line can be removed from the production flow
by employing the CS Series Serial EEPROM. The 128-bit serial number is programmed and permanently locked from
future writing during the Atmel production process. Further, this 128-bit location does not consume any of the user
read/write area of the 4-Kbit or 8-Kbit Serial EEPROM. The uniqueness of the serial number is guaranteed across the
entire CS Series of Serial EEPROMs, regardless of the size of the memory array or the type of interface protocol. This
means that as an application's needs for memory size or interface protocol evolve in future generations, any previously
deployed serial number from any Atmel CS Series Serial EEPROM part will remain valid.
2.
Pin Descriptions and Pinout
Figure 2-1. Pin Configuration
8-lead SOIC
Pin Name
NC
A
1
A
2
SDA
SCL
WP
GND
V
CC
Function
No Connect
Address Input (4K only)
Address Input
Serial Data
Serial Clock Input
Write Protect
Ground
Power Supply
NC
A
1
/NC
A
2
GND
1
2
3
4
8
7
6
5
V
CC
WP
SCL
SDA
NC
A
1
/NC
A
2
GND
8-lead TSSOP
1
2
3
4
8
7
6
5
V
CC
WP
SCL
SDA
8-pad UDFN
V
CC
8
WP 7
SCL 6
SDA 5
1 NC
2 A
1
/NC
3 A
2
4 GND
SCL
GND
SDA
5-lead SOT23
1
2
3
4
V
CC
5
WP
Bottom View
Note:
For use of 5-lead SOT23, the software A2, A1, and A0 bits in the device address word must be set to
zero to properly communicate with the device.
Atmel AT24CS04/08 [PRELIMINARY DATASHEET]
8766B–SEEPR–8/12
2
3.
Absolute Maximum Ratings
Operating Temperature ........................–55C to +125C
Storage Temperature ...........................–65C to +150C
Voltage on any pin
with respect to ground .............................–1.0V to +7.0V
Maximum Operating Voltage ................................. 6.25V
DC Output Current................................................ 5.0mA
*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.
4.
Block Diagram
Figure 4-1. Block Diagram
V
CC
GND
WP
SCL
SDA
Start
Stop
Logic
Serial
Control
Logic
Enable
High Voltage
Pump & Timing
Device
Address
Comparator
Data Latches
COMP
Load
INC
Data Word
ADDR/Counter
128-bit
Serial
Number
Column
Decoder
Row Decoder
A
2
A
1
Read/Write
EEPROM
Array
Read
Serial MUX
D
OUT
/ ACK
Logic
D
OUT
D
IN
Atmel AT24CS04/08 [PRELIMINARY DATASHEET]
8766B–SEEPR–8/12
3
5.
Pin Description
Serial Clock (SCL):
The SCL input is used to positive edge clock data into each EEPROM device and negative edge
clock data out of each device.
Serial Data (SDA):
The SDA pin is bidirectional for serial data transfer. This pin is open-drain driven and may be
wire-ORed with any number of other open-drain or open-collector devices.
Device Addresses (A
2
, A
1
):
The AT24CS04 uses the A
2
and A
1
inputs for hard wire addressing allowing a total of four
4-Kbit devices to be addressed on a single bus system. Pin 1 is a no connect and can be connected to ground.
The AT24CS08 only uses the A
2
input for hardware addressing and a total of two 8K devices may be addressed on a
single bus system. Pins 1 and 2 are no connects and can be connected to ground. Refer to
Section 8. “Device
Addressing” on page 10
for details about the pin state and the required protocol for communication .
The device address pins are not available on the SOT23 package offering. Refer to
Section 8. “Device Addressing” on
page 10
for details on the protocol requirements with this package.
Write Protect (WP):
AT24CS04/08 has a Write Protect (WP) pin that provides hardware data protection. When the Write
Protect pin is connected to ground (GND), normal read/write operations to the full array are possible. When the Write
Protect pin is connected to V
CC
, all write operations to the memory are inhibited but read operations are still possible.
This operation is summarized in
Table 5-1
below.
Table 5-1.
WP Pin
Status
At V
CC
At GND
Write Protect
Part of the Array Protected
Atmel AT24CS04/08
Full Array
Normal Read/Write Operations
Atmel AT24CS04/08 [PRELIMINARY DATASHEET]
8766B–SEEPR–8/12
4
6.
Memory Organization
Atmel AT24CS04, 4K Serial EEPROM:
Internally organized with 32 pages of 16 bytes each, the 4-Kbit device requires
a 9-bit data word address for random word addressing.
Atmel AT24CS08, 8K Serial EEPROM:
Internally organized with 64 pages of 16 bytes each, the 8-Kbit device requires
a 10-bit data word address for random word addressing.
Table 6-1.
Pin Capacitance
(1)
Applicable over recommended operating range from T
A
= 25°C, f = 1.0MHz, V
CC
= 1.7V to 5.5V
Symbol
C
I/O
C
IN
Test Condition
Input/Output Capacitance (SDA)
Input Capacitance (A
1
, A
2
, SCL)
Max
8
6
Units
pF
pF
Conditions
V
I/O
= 0V
V
IN
= 0V
Note:
1.
This parameter is characterized and is not 100% tested.
Table 6-2.
DC Characteristics
Applicable over recommended operating range from: T
AI
= -40C to +85C, V
CC
= 1.7V to 5.5V (unless otherwise noted)
Symbol
V
CC
I
CC1
I
CC2
I
SB1
I
SB2
I
LI
I
LO
V
IL
V
IH
V
OL1
V
OL2
Parameter
Supply Voltage
Supply Current V
CC
= 5.0V
Supply Current V
CC
= 5.0V
Standby Current V
CC
= 1.7V
Standby Current V
CC
= 5.5V
Input Leakage Current
Output Leakage Current
Input Low Level
(1)
Input High Level
(1)
Output Low Level V
CC
= 1.7V
Output Low Level V
CC
= 3.0V
I
OL
= 0.15mA
I
OL
= 2.1mA
Read at 400kHz
Write at 400kHz
V
IN
= V
CC
or V
SS
V
IN
= V
CC
or V
SS
V
IN
= V
CC
or V
SS
V
OUT
= V
CC
or V
SS
–0.6
V
CC
x 0.7
0.10
0.05
Test Condition
Min
1.7
0.4
2.0
Typ
Max
5.5
1.0
3.0
1.0
6.0
3.0
3.0
V
CC
x 0.3
V
CC
+ 0.5
0.2
0.4
Units
V
mA
mA
μA
μA
μA
μA
V
V
V
V
Note:
1.
V
IL
min and V
IH
max are reference only and are not tested.
Atmel AT24CS04/08 [PRELIMINARY DATASHEET]
8766B–SEEPR–8/12
5
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