The CAT25256 is a 256-kb Serial CMOS EEPROM device internally organized as 32kx8 bits. This features a 64-byte page write buffer and supports the Serial Peripheral Interface (SPI) protocol. The device is enabled through a Chip Select (
) input. In addition, the required bus signals are clock input (SCK), data input (SI) and data output (SO) lines. The
input may be used to pause any serial communication with the CAT25256 device. The device features software and hardware write protection, including partial as well as full array protection.
On-Chip ECC (Error Correction Code) makes the device suitable for high reliability applications.
Available for New Product (Rev. E).

• 20 MHz (5 V) SPI Compatible
• 1.8 V to 5.5 V Supply Voltage Range
• SPI Modes (0,0) & (1,1)
• 64-byte Page Write Buffer
• Additional Identification Page with Permanent Write Protection (New Product)
• Self-timed Write Cycle
• Hardware and Software Protection
• 100 Year Data Retention
• 1,000,000 Program/Erase Cycles
• Low Power CMOS Technology
• Block Write Protection
• - Protect 1/4, 1/2 or Entire EEPROM Array
• Industrial and Extended Temperature Range
• 8-lead PDIP, SOIC, TSSOP and 8-pad UDFN and TDFN Packages
• This Device is Pb-Free, Halogen Free/BFR Free, and RoHS Compliant