DESCRIPTION
The IS24C128A/256A is an electrically erasable PROM device that uses the standard 2-wire interface for communications. The IS24C128A is 128K-bit (16Kx8) and the IS24C256A is 256K-bit (32Kx8). These EEPROM are offered in a wide operating voltage range of 1.8V to 5.5V to be compatible with most application voltages. ISSI designed the IS24C128A/256A to be an efficient 2-wire EEPROM solution. The devices are packaged in 8-pin PDIP, 8-pin (JEDEC) SOIC, and 8-pin (EIAJ) SOIC.

FEATURES
• Two-Wire Serial Interface, I2CTM compatible
   –Bi-directional data transfer protocol
• Wide Voltage Operation
   –Vcc = 1.8V to 5.5V
• 400 KHz (2.5V) and 1 MHz (5.0V) compatibility
• Low Power CMOS Technology
   –Active Current less than 3 mA (2.5V)
   –Standby Current less than 20 µA (2.5V)
• Hardware Data Protection
   –Write Protect Pin
• Sequential Read Feature
• Filtered Inputs for Noise Suppression
• Self time write cycle with auto clear
   –5 ms @ 2.5V
• Organization:
   –16Kx8 (256 pages of 64 bytes)
   –32Kx8 (512 pages of 64 bytes)
• 64 Byte Page Write Buffer
• High Reliability
   –Endurance: 1,000,000 Cycles
   –Data Retention: 40 Years
• Industrial and Automotive temperature ranges
• 8-pin PDIP, 8-pin (JEDEC) SOIC, and 8-pin (EIAJ) SOIC packages
• Lead-free available