25AA040A-I/SN

Product Overview

Category: Integrated Circuit (IC)

Use: Non-volatile Memory

Characteristics: - Serial EEPROM (Electrically Erasable Programmable Read-Only Memory) - Low-power consumption - High reliability - Small form factor - Wide operating voltage range

Package: SOIC (Small Outline Integrated Circuit)

Essence: The 25AA040A-I/SN is a serial EEPROM IC that provides non-volatile memory storage. It is commonly used in various electronic devices to store configuration data, calibration values, and other critical information.

Packaging/Quantity: The 25AA040A-I/SN is available in a standard SOIC package. Each package contains one IC.

Specifications

• Memory Size: 4 kilobits (512 bytes)
• Interface: Serial Peripheral Interface (SPI)
• Operating Voltage Range: 1.8V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Write Endurance: 1 million cycles
• Data Retention: 200 years

Detailed Pin Configuration

The 25AA040A-I/SN has a total of 8 pins:

1. Chip Select (/CS): Used to enable or disable the device for communication.
2. Serial Clock (SCK): Provides the clock signal for data transfer.
3. Serial Data Input (SI): Used to input data into the device.
4. Serial Data Output (SO): Outputs data from the device.
5. Write Protect (/WP): When pulled low, prevents write operations.
6. VCC: Power supply input (+1.8V to +5.5V).
7. Ground (GND): Common ground reference.
8. Hold (/HOLD): Allows pausing serial communication without losing data.

Functional Features

• Byte and Page Write Operations: Allows individual byte or page (up to 32 bytes) write operations.
• Sequential Read: Supports sequential read of data from the memory array.
• Software Protection: Provides software protection by enabling write protection and disabling write operations.
• Hardware Protection: Supports hardware protection by using the Write Protect (/WP) pin.
• Self-timed Erase/Write Cycle: Automatically manages erase and write cycles, simplifying the programming process.

Advantages and Disadvantages

Advantages: - Compact size and low power consumption make it suitable for portable devices. - High reliability ensures data integrity in critical applications. - Wide operating voltage range allows compatibility with various systems. - Easy integration into existing designs due to standard SPI interface.

Disadvantages: - Limited storage capacity compared to other memory options. - Slower write speed compared to some alternative models. - Lack of built-in security features for data protection.

Working Principles

The 25AA040A-I/SN utilizes an EEPROM technology that allows data to be written and erased electrically. It uses a floating gate transistor structure to store charge, which represents binary information. The device communicates with the host microcontroller through the Serial Peripheral Interface (SPI), enabling easy integration into various systems.

Detailed Application Field Plans

The 25AA040A-I/SN is widely used in the following applications:

1. Consumer Electronics: Used for storing configuration settings, user preferences, and firmware updates in devices such as TVs, set-top boxes, and audio systems.
2. Industrial Automation: Stores calibration data, system parameters, and event logs in industrial control systems, PLCs (Programmable Logic Controllers), and sensors.
3. Automotive Electronics: Used for storing vehicle-specific data, such as mileage, service history, and diagnostic information in automotive ECUs (Electronic Control Units).
4. Medical Devices: Stores patient data, device settings, and firmware updates in medical equipment like patient monitors, infusion pumps, and diagnostic devices.

Detailed and Complete Alternative Models

1. 25LC040A: Similar specifications and functionality, available in DIP (Dual Inline Package) package.
2. AT25040A: Equivalent EEPROM IC from Atmel, compatible with SPI interface.
3. CAT24C04: I2C-compatible EEPROM IC with similar storage capacity.

These alternative models offer similar features and can be used as replacements for the 25AA040A-I/SN depending on specific design requirements.

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