25LC040A-M/P

Product Overview

Category: Integrated Circuit (IC)

Use: Non-volatile Serial EEPROM Memory

Characteristics: - Low-power CMOS technology - 4Kbits of memory organized as 512 x 8 - SPI compatible serial interface - Self-timed erase and write cycles - Power-on/off data protection - 1,000,000 erase/write cycles guaranteed - 100-year data retention

Package: DIP-8 (Dual In-line Package)

Essence: The 25LC040A-M/P is a non-volatile memory chip that provides reliable storage for small amounts of data in various electronic devices.

Packaging/Quantity: The 25LC040A-M/P is typically sold in reels or tubes, with each reel/tube containing a specific quantity of chips. The exact packaging and quantity may vary depending on the supplier.

Specifications

• Memory Size: 4Kbits (512 bytes)
• Interface: SPI (Serial Peripheral Interface)
• Supply Voltage: 2.5V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Write Endurance: 1,000,000 cycles
• Data Retention: 100 years

Pin Configuration

The 25LC040A-M/P has 8 pins arranged as follows:

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

Pin Description: 1. Chip Select (CS): Used to enable/disable the chip for communication. 2. Serial Clock (SCK): Provides the clock signal for data transfer. 3. Serial Data Input (SI): Data input line for sending commands and data to the chip. 4. Ground (GND): Connected to the ground reference of the system. 5. Serial Data Output (SO): Data output line for receiving data from the chip. 6. Write Protect (WP): Optional pin used to protect the memory from accidental writes. 7. VCC: Power supply voltage. 8. Not Connected (NC): This pin is not connected and should be left unconnected.

Functional Features

• Non-volatile Memory: The 25LC040A-M/P retains data even when power is removed, ensuring data integrity.
• SPI Interface: The chip uses a serial peripheral interface for easy integration with microcontrollers and other devices.
• Self-timed Erase and Write Cycles: The chip handles erase and write operations automatically, simplifying the programming process.
• Power-on/Off Data Protection: The memory contents are protected during power transitions, preventing data corruption.
• High Endurance and Retention: The chip guarantees 1,000,000 erase/write cycles and can retain data for up to 100 years.

Advantages and Disadvantages

Advantages: - Low-power consumption - Compact size - Easy integration with SPI-compatible devices - High endurance and data retention - Power-on/off data protection

Disadvantages: - Limited storage capacity (4Kbits) - Slower data transfer rate compared to some other memory technologies

Working Principles

The 25LC040A-M/P operates based on the principles of electrically erasable programmable read-only memory (EEPROM). It utilizes a floating gate transistor structure to store charge, representing binary data. The SPI interface allows for easy communication with external devices, enabling read, write, and erase operations.

During write cycles, the chip applies a high voltage to the memory cells, allowing electrons to tunnel through an insulating layer onto the floating gate. This process traps charge on the floating gate, altering the threshold voltage of the transistor and storing data.

Reading data involves applying appropriate voltages to the memory cells and sensing the resulting current flow. Erasing data is achieved by removing the trapped charge from the floating gate using an electrical erase operation.

Detailed Application Field Plans

The 25LC040A-M/P finds applications in various electronic devices that require non-volatile storage for small amounts of data. Some common application fields include:

1. Consumer Electronics: Used in smartwatches, fitness trackers, remote controls, and other portable devices to store user settings, calibration data, and firmware updates.
2. Industrial Automation: Employed in programmable logic controllers (PLCs), sensors, and control systems to store configuration parameters, calibration data, and event logs.
3. Automotive Electronics: Integrated into automotive modules and systems for storing vehicle-specific data, such as mileage, fault codes, and user preferences.
4. Medical Devices