Description
The Atmel® AT24CS04 and AT24CS08 provides 4096/8192 bits of Serial Electrically Erasable and Programmable LButtonRead-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 VCC.

Standard Features
• Low-voltage operation
 VCC = 1.7V to 5.5V
• Internally organized as 512 x 8 (4-Kbit) or 1024 x 8 (8-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, 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