Encyclopedia Entry: 25AA256-I/ST

Product Overview

Category: Integrated Circuit (IC)

Use: The 25AA256-I/ST is a serial EEPROM (Electrically Erasable Programmable Read-Only Memory) IC. It is commonly used for non-volatile data storage in various electronic devices.

Characteristics: - Low power consumption - High reliability and endurance - Small form factor - Serial interface for easy integration - Wide operating voltage range

Package: The 25AA256-I/ST is available in an 8-pin SOIC (Small Outline Integrated Circuit) package.

Essence: This IC provides a compact and reliable solution for storing and retrieving data in electronic systems.

Packaging/Quantity: The 25AA256-I/ST is typically sold in reels containing 2500 units.

Specifications

• Memory Capacity: 256 kilobits (32 kilobytes)
• 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

Pin Configuration

The 25AA256-I/ST has the following pin configuration:

┌───┬───┐ │ 1 │ 8 │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ │ 4 │ 5 │ └───┴───┘

Pin Description: 1. Chip Select (CS): Used to enable/disable the IC for communication. 2. Serial Clock (SCK): Provides the clock signal for data transfer. 3. Master Input Slave Output (MISO): Data output from the IC to the master device. 4. Ground (GND): Reference ground for the IC. 5. Serial Data Input/Output (SDI/SDO): Bidirectional data line for communication. 6. Write Protect (WP): Optional pin for write protection. 7. Hold (HOLD): Optional pin for suspending operations. 8. Power Supply (VCC): Positive power supply voltage.

Functional Features

• Byte-level read and write operations
• Software and hardware write protection options
• Sequential and random access modes
• Self-timed programming cycle
• Built-in write cycle completion detection

Advantages and Disadvantages

Advantages: - Low power consumption makes it suitable for battery-powered devices. - High reliability ensures data integrity in critical applications. - Small form factor allows for space-efficient designs. - Wide operating voltage range enables compatibility with various systems. - Easy integration through the serial interface simplifies implementation.

Disadvantages: - Limited storage capacity compared to other memory technologies. - Relatively slower write speeds compared to some alternatives. - Susceptible to electromagnetic interference due to the serial interface.

Working Principles

The 25AA256-I/ST utilizes EEPROM technology, which allows for non-volatile data storage that can be electrically erased and reprogrammed. It uses a serial interface based on the SPI protocol for communication with the host system. The IC operates by receiving commands and data from the master device, performing the necessary operations, and providing the requested information or status back to the master.

Detailed Application Field Plans

The 25AA256-I/ST is widely used in various electronic systems, including but not limited to: - Consumer electronics (e.g., smart TVs, set-top boxes) - Automotive electronics (e.g., infotainment systems, engine control units) - Industrial automation (e.g., programmable logic controllers, sensors) - Medical devices (e.g., patient monitoring systems, diagnostic equipment) - Internet of Things (IoT) devices (e.g., smart home appliances, wearable devices)

Detailed and Complete Alternative Models

Some alternative models to the 25AA256-I/ST include: - AT25080A-10PU-2.7: 8-kilobit SPI EEPROM from Atmel - CAT24C256WI-GT3: 256-kilobit I2C EEPROM from ON Semiconductor - M95640-WMN6TP: 64-kilobit SPI EEPROM from STMicroelectronics - 93LC66B-I/SN: 4-kilobit Microwire EEPROM from Microchip Technology

These alternatives offer similar functionality and can be chosen based on specific system requirements.

In conclusion, the 25AA256-I/ST is a versatile serial EEPROM IC that provides reliable non-volatile data storage for various electronic devices. Its low power consumption, small form factor, and wide operating voltage