25AA256T-I/SN

Product Overview

Category: Integrated Circuit (IC)

Use: Non-volatile Serial EEPROM Memory

Characteristics: - High-density memory storage - Low power consumption - Serial interface for easy integration - Reliable data retention and endurance - Wide operating voltage range - Small form factor

Package: SOIC (Small Outline Integrated Circuit)

Essence: The 25AA256T-I/SN is a high-performance serial EEPROM memory chip that provides non-volatile storage for various electronic devices. It offers a compact and reliable solution for storing critical data in applications such as consumer electronics, industrial automation, automotive systems, and more.

Packaging/Quantity: The 25AA256T-I/SN is available in a standard SOIC package. Each package contains one individual chip.

Specifications

• Memory Size: 256 kilobits (32 kilobytes)
• Interface: Serial Peripheral Interface (SPI)
• Operating Voltage Range: 1.8V to 5.5V
• Data Retention: Up to 200 years
• Endurance: 1 million write cycles
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The 25AA256T-I/SN has a total of 8 pins arranged as follows:

1. Chip Select (/CS) - Active low input used to enable or disable the chip.
2. Serial Clock (SCK) - Input for synchronizing data transfer.
3. Serial Data Input (SI) - Input for sending data to the chip.
4. Serial Data Output (SO) - Output for receiving data from the chip.
5. Write Protect (/WP) - Input for write protection.
6. VCC - Power supply voltage.
7. Ground (GND) - Ground reference.
8. Hold (/HOLD) - Input for pausing serial communication.

Functional Features

• Byte and Page Write Operations: Allows individual byte or page (up to 64 bytes) write operations, providing flexibility in data storage.
• Sequential Read: Supports sequential read operations, enabling efficient retrieval of stored data.
• Software Protection: Provides software write protection to prevent accidental modification of stored data.
• Hardware Protection: Offers hardware write protection using the /WP pin, ensuring data integrity.
• Self-Timed Programming Cycle: Automatically manages internal timing during write operations, simplifying the integration process.
• Power-Saving Modes: Includes power-saving features such as standby and sleep modes to minimize power consumption.

Advantages and Disadvantages

Advantages: - High-density memory storage allows for ample data storage capacity. - Low power consumption ensures energy efficiency. - Serial interface simplifies integration with various microcontrollers and systems. - Reliable data retention and endurance ensure long-term data integrity. - Wide operating voltage range provides compatibility with different power supply levels. - Small form factor enables space-efficient designs.

Disadvantages: - Limited storage capacity compared to larger EEPROM memory chips. - Slower write speeds compared to other non-volatile memory technologies. - Vulnerable to electromagnetic interference (EMI) due to its small size.

Working Principles

The 25AA256T-I/SN utilizes an SPI interface to communicate with external devices. It stores data in non-volatile memory cells that can retain information even when power is disconnected. The chip operates by receiving commands and data through the SPI interface, which it then writes into the appropriate memory locations. During read operations, the chip retrieves stored data and sends it back through the SPI interface for further processing.

Detailed Application Field Plans

The 25AA256T-I/SN finds applications in various fields, including:

1. Consumer Electronics:

   • Smartphones and tablets
   • Digital cameras
   • Gaming consoles

2. Industrial Automation:

   • Programmable logic controllers (PLCs)
   • Human-machine interfaces (HMIs)
   • Data loggers

3. Automotive Systems:

   • Engine control units (ECUs)
   • Infotainment systems
   • Advanced driver-assistance systems (ADAS)

4. Medical Devices:

   • Patient monitoring systems
   • Portable medical equipment
   • Diagnostic devices

Detailed and Complete Alternative Models

1. 25AA512-I/SN: Similar to the 25AA256T-I/SN but with double the memory capacity (512 kilobits).
2. 25LC640A-I/SN: Offers the same memory size as the 25AA256T-I/SN but with an extended temperature range (-40°C to +125°C).
3. 24LC256-I/SN: Provides the same memory size and package as the 25AA256T-I/SN but operates on the I2C interface instead of SPI.

These alternative models offer similar functionality and can be considered based on specific project requirements.

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