The Microchip Technology Inc. 25LC1024 is a 1024 Kbit serial EEPROM memory with byte-level and pagelevel serial EEPROM functions. It also features Page, Sector and Chip erase functions typically associated with Flash-based products. These functions are not required for byte or page write operations. The memory is accessed via a simple Serial Peripheral Interface (SPI) compatible serial bus. The bus signals required are a clock input (SCK) plus separate data in (SI) and data out (SO) lines. Access to the device is controlled by a Chip Select (CS) input.

Parameter Name	Value
Density	1024K bits (x8)
Op. Volt Range (V)	2.5 to 5.5
Max. Clock Freq.	20 MHz
Page Size (bytes)	256
Write Protect	Quarter, Half, Whole Array
Temp Range (°C)	-40°C to +85°C
Endurance	1000000

• Byte and Page-level Write Operations:      -  256 byte page      -  6 ms max. write cycle time      -  No page or sector erase required
• Low-Power CMOS Technology:      -  Max. Write current: 5 mA at 5.5V, 20 MHz      -  Read current: 7 mA at 5.5V, 20 MHz      -  Standby current: 1μA at 2.5V
• Electronic Signature for Device ID
• Self-Timed Erase and Write Cycles:      -  Page Erase (6 ms max.)      -  Sector Erase (10 ms max.)      -  Chip Erase (10 ms max.)
• Sector Write Protection (32K byte/sector)
• Built-In Write Protection
• High Reliability

25LC1024 1 Mbit SPI Bus Serial EEPROM Data Sheet