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 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 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 VCC.

Standard Features
● Low-voltage operation
   ̶ VCC = 1.7V to 5.5V
● Internally organized as 128 x 8 (1-Kbit) or 256 x 8 (2-Kbit)
● I2C-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