AT24CS01 and AT24CS02 2 I C-Compatible (2-wire) Serial EEPROM with a Unique, Factory Programmed 128-bit Serial Number 1-Kbit (128 x 8), 2-Kbit (256 x 8) DATASHEET Standard Features Low-voltage Operation V = 1.7V to 5.5V CC Internally Organized as 128 x 8 (1-Kbit) or 256 x 8 (2-Kbit) 2 I C-compatible (2-wire) Serial Interface Schmitt Trigger, Filtered Inputs for Noise Suppression Bidirectional Data Transfer Protocol 400kHz (1.7V) and 1MHz (2.5V, 5.0V) Compatibility Write Protect Pin for Hardware Data Protection 8-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 Atmel-8815E-SEEPROM-AT24CS01-02-Datasheet 0120151. Description The Atmel AT24CS01 and AT24CS02 provides 1024/2048 bits of Serial Electrically Erasable and Programmable Read-only Memory (EEPROM) organized as 128/256 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 AT24CS01/02 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 AT24CS01/02 provides the additional feature of a factory programmed, guaranteed unique 128-bit serial number, while maintaining all of the traditional features available in the 1-Kbit or 2-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 1-Kbit or 2-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 8-lead SOIC 8-lead TSSOP Pin Name Function (Top View) (Top View) A - A Address Inputs 0 2 A 1 8 V A V 0 CC 0 1 8 CC A 2 7 WP 1 A 2 7 WP 1 SDA Serial Data A 3 6 SCL 2 3 6 A SCL 2 4 5 GND SDA 4 5 GND SDA SCL Serial Clock Input WP Write Protect 8-pad UDFN 5-lead SOT23 (Top View) (Top View) GND Ground A V 0 1 8 CC SCL 1 5 WP V Power Supply CC A WP 1 2 7 A SCL 2 3 6 GND 2 GND SDA 4 5 3 4 V SDA CC 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 AT24CS01/02 DATASHEET Atmel-8815E-SEEPROM-AT24CS01-02-Datasheet 012015