1. Description
The Atmel® AT24CS04 and AT24CS08 provides 4,096/8,192 bits of Serial Electrically Erasable and
Programmable Read-only Memory (EEPROM) organized as 512/1,024 words of 8 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 VCC.
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 Pinouts
Figure 2-1. Pin Configuration
Pin Name
NC
A1
A2
SDA
SCL
WP
GND
VCC
Function
No Connect
Address Input (4K only)
Address Input
Serial Data
Serial Clock Input
Write Protect
Ground
Power Supply
8-lead SOIC
(Top View)
NC
1
A1/NC
2
A2
3
GND 4
8
VCC
NC
7
WP A1/NC
6
SCL
A2
GND
5
SDA
8-lead TSSOP
(Top View)
1
8
2
7
3
6
4
5
VCC
WP
SCL
SDA
8-pad UDFN
(Top View)
NC
1
A1/NC
2
A2
3
GND 4
8
VCC
7 WP
6 SCL
5 SDA
5-lead SOT23
(Top View)
SCL 1 5 WP
GND 2
SDA
34
VCC
Notes: 1. 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.
2. Drawings are not to scale.
2
AT24CS04/08 [DATASHEET]
Atmel-8766E-SEEPROM-AT24CS04-08-Datasheet_012015
