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25LC640A

MCHP25LC640A

Microchip Technology
SPI 64-Kbit serial EEPROM alternative when FRAM-specific endurance or write-speed advantages are not required.
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Overview

The 25LC640A is a 64-Kbit serial EEPROM organized as 8K x 8 bits, designed for high-reliability non-volatile data storage. It utilizes a standard SPI interface and supports clock frequencies up to 10 MHz across a wide supply voltage range of 2.5V to 5.5V.

Why Choose This Part

The device features low-power CMOS technology with a 1 uA standby current, making it ideal for battery-operated designs. It includes hardware and software write protection, a 32-byte page write buffer, and is AEC-Q100 qualified for automotive reliability requirements.

Applications

Configuration Storage
Storing calibration data, device IDs, and network configuration parameters in embedded systems.
Data Logging
Recording system events or sensor readings where low-frequency updates are required.
User Settings
Maintaining user-defined preferences and operational states across power cycles.

Key Specifications

Technology EEPROM
Memory Size 64Kbit
Memory Type Non-Volatile
Memory Format EEPROM
Mounting Type Surface Mount
Package / Case 8-SOIC (0.154", 3.90mm Width)
Clock Frequency 10 MHz
Memory Interface SPI
Voltage - Supply 2.5V ~ 5.5V
Memory Organization 8K x 8
Operating Temperature -40degC ~ 85degC (TA)
Supplier Device Package 8-SOIC
Write Cycle Time - Word, Page 5ms

Getting Started

To interface with this EEPROM, configure your microcontroller SPI peripheral for Mode 0 or Mode 3. Use the standard 8-bit instruction set for operations such as READ, WRITE, and WREN (Write Enable). Hardware implementation requires a Chip Select (CS) line and optionally a WP pin for hardware write protection.

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