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25AA640A

MCHP25AA640A

Microchip Technology
Same 64-Kbit density in Microchip's SPI EEPROM family as an alternative option
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Overview

The Microchip 25AA640A is a 64-Kbit SPI EEPROM, providing non-volatile data storage for embedded systems. It offers reliable data retention and operates across a wide voltage range of 1.8V to 5.5V, supporting a clock frequency of up to 10 MHz. Its 8K x 8 organization makes it suitable for various data logging and configuration storage tasks.

Why Choose This Part

This EEPROM features built-in write protection mechanisms, including block write protection and a write-protect pin, enhancing data integrity. Its low standby current of 1uA makes it suitable for power-sensitive applications. The part is also Automotive AEC-Q100 Qualified, indicating its suitability for automotive environments.

Applications

Configuration Storage
Storing system configuration parameters that need to persist across power cycles in embedded devices.
Data Logging
Recording sensor data or event logs in applications where a limited amount of non-volatile storage is required.
Calibration Data Storage
Saving calibration coefficients for analog sensors or actuators.
Bootloader Parameters
Holding bootloader-specific settings or flags for microcontrollers.

Key Specifications

Technology EEPROM
Memory Size 64Kbit
Memory Type Non-Volatile
Memory Format EEPROM
Mounting Type Surface Mount
Package / Case 8-WFDFN Exposed Pad
Clock Frequency 10 MHz
Memory Interface SPI
Voltage - Supply 1.8V ~ 5.5V
Memory Organization 8K x 8
Operating Temperature -40degC ~ 85degC (TA)
Supplier Device Package 8-TDFN (2x3)
Write Cycle Time - Word, Page 5ms

Getting Started

Integrating the 25AA640A involves connecting its SPI interface to a microcontroller. Microchip provides example code and libraries for common microcontrollers that can be adapted for SPI EEPROM communication. Development boards featuring Microchip PIC or AVR microcontrollers often have SPI peripheral examples that can be leveraged.

Also Consider

AT25SF041B MCHPMicrochip Technology - A 4-Mbit serial flash memory, which provides higher density storage if the application requires more memory than an EEPROM.
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