Encyclopedia Entry: 25AA040AT-I/SN

Product Overview

Category: Integrated Circuits (ICs)

Use: Non-volatile Memory

Characteristics: Serial EEPROM, 4K (512 x 8) Bits, SPI Interface

Package: SOIC (Small Outline Integrated Circuit)

Essence: The 25AA040AT-I/SN is a serial EEPROM integrated circuit that provides non-volatile memory storage. It offers a capacity of 4K bits, organized as 512 bytes by 8 bits. The device utilizes the Serial Peripheral Interface (SPI) for communication with other devices.

Packaging/Quantity: The 25AA040AT-I/SN is available in a Small Outline Integrated Circuit (SOIC) package. It is typically sold in reels or tubes, with a quantity of multiple units per package.

Specifications

• Memory Type: EEPROM
• Memory Size: 4K bits (512 x 8)
• Interface: SPI (Serial Peripheral Interface)
• Supply Voltage: 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 25AA040AT-I/SN has a total of 8 pins, each serving a specific purpose:

1. Chip Select (CS): Used to enable/disable the device for communication.
2. Serial Clock (SCK): Provides the clock signal for data transfer.
3. Serial Data Input (SI): Receives data from the master device during write operations.
4. Serial Data Output (SO): Transmits data from the device to the master device during read operations.
5. Write Protect (WP): Allows protection against accidental write operations.
6. Hold (HOLD): Pauses ongoing operations without resetting the device.
7. VCC: Power supply input (1.8V to 5.5V).
8. Ground (GND): Common ground reference.

Functional Features

• High-Speed SPI Interface: The 25AA040AT-I/SN supports a Serial Peripheral Interface (SPI) for fast and efficient data transfer.
• Low Power Consumption: The device operates with low power requirements, making it suitable for battery-powered applications.
• Write Protection: The Write Protect (WP) pin allows users to protect the memory content from accidental modifications.
• Data Retention: The EEPROM ensures data retention for up to 200 years, even in the absence of power.

Advantages and Disadvantages

Advantages: - Compact Size: The SOIC package offers a small form factor, ideal for space-constrained designs. - Easy Integration: The SPI interface simplifies integration with other devices. - High Reliability: The EEPROM technology provides reliable non-volatile memory storage. - Wide Operating Voltage Range: The device can operate within a wide voltage range, enhancing compatibility.

Disadvantages: - Limited Storage Capacity: With a capacity of 4K bits, the 25AA040AT-I/SN may not be suitable for applications requiring larger memory sizes. - Slower Write Speed: Compared to some other memory technologies, EEPROMs generally have slower write speeds.

Working Principles

The 25AA040AT-I/SN utilizes EEPROM technology to store data. It employs a floating-gate transistor structure that allows for non-volatile storage of electrical charges. The SPI interface enables communication between the device and a master device, facilitating read and write operations. The memory content is retained even when power is removed, ensuring data integrity.

Detailed Application Field Plans

The 25AA040AT-I/SN finds application in various fields, including but not limited to:

1. Consumer Electronics: Used in devices such as smart TVs, set-top boxes, and audio systems for storing configuration data.
2. Automotive: Employed in automotive electronics for storing critical information like calibration data, mileage, and user preferences.
3. Industrial Automation: Utilized in industrial control systems for storing parameters, firmware updates, and device configurations.
4. Medical Devices: Integrated into medical equipment for storing patient data, device settings, and event logs.

Detailed and Complete Alternative Models

1. 25AA080D-I/SN: Similar to the 25AA040AT-I/SN but with double the memory capacity (8K bits).
2. 25LC256-I/SN: Offers a larger memory size of 256K bits, suitable for applications requiring more storage.
3. 24AA02E48-I/OT: A smaller EEPROM with a capacity of 2K bits, designed for space-constrained applications.

These alternative models provide options with varying memory capacities to suit different application requirements.

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