Encyclopedia Entry: 25AA640/S

Product Overview

• Category: Non-volatile Memory
• Use: Data Storage and Retrieval
• Characteristics: High Capacity, Serial Interface, Low Power Consumption
• Package: SOP (Small Outline Package)
• Essence: EEPROM (Electrically Erasable Programmable Read-Only Memory)
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Memory Size: 64 Kilobits (8 Kilobytes)
• Interface: SPI (Serial Peripheral Interface)
• Operating 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 25AA640/S has a total of 8 pins: 1. Chip Select (/CS) 2. Serial Clock (SCK) 3. Serial Data Input (SI) 4. Serial Data Output (SO) 5. Write Protect (/WP) 6. Hold (/HOLD) 7. VCC (Power Supply) 8. Ground (GND)

Functional Features

• High-speed data transfer using the SPI interface
• Byte-level read and write operations
• Software and hardware write protection options
• Low power consumption during standby mode
• Flexible erase capability for individual bytes or full memory

Advantages and Disadvantages

Advantages: - Compact SOP package for space-constrained applications - Wide operating voltage range allows compatibility with various systems - High endurance and long data retention period - Easy integration into existing designs due to standard SPI interface

Disadvantages: - Limited storage capacity compared to other memory types - Slower write speed compared to some competing technologies

Working Principles

The 25AA640/S is based on EEPROM technology, which allows for non-volatile data storage. It utilizes a serial interface (SPI) to communicate with the host microcontroller or system. The memory can be written to and read from at the byte level, providing flexibility in data manipulation. The chip also supports software and hardware write protection mechanisms to prevent accidental modification of stored data.

Detailed Application Field Plans

The 25AA640/S is commonly used in various electronic devices that require non-volatile memory for data storage and retrieval. Some typical application fields include: - Consumer Electronics: Smartphones, tablets, digital cameras - Automotive: Infotainment systems, instrument clusters - Industrial: Data loggers, control systems, sensors - Medical: Patient monitoring devices, diagnostic equipment

Alternative Models

• AT25080A: 8 Kilobit SPI Serial EEPROM
• CAT24C64: 64 Kilobit I2C Serial EEPROM
• M93C66: 4 Kilobyte Microwire Serial EEPROM

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