25LC040A-M/SN

Product Overview

Category: Integrated Circuit (IC)

Use: Non-volatile Serial EEPROM Memory

Characteristics: - Low-power CMOS technology - 4K-bit memory array - SPI compatible serial interface - Self-timed erase and write cycles - 1,000,000 erase/write cycles endurance - Data retention > 200 years - 64-byte page write mode - Hardware write protection - Low power consumption - Small form factor

Package: SOIC (Small Outline Integrated Circuit)

Essence: The 25LC040A-M/SN is a non-volatile serial EEPROM memory chip that provides reliable data storage in various electronic devices. It offers low power consumption, high endurance, and small form factor, making it suitable for applications where space and power efficiency are crucial.

Packaging/Quantity: The 25LC040A-M/SN is available in a SOIC package with a quantity of 250 units per reel.

Specifications

• Memory Size: 4K bits (512 bytes)
• Interface: SPI (Serial Peripheral Interface)
• Supply Voltage: 2.5V - 5.5V
• Operating Temperature Range: -40°C to +85°C
• Write Endurance: 1,000,000 cycles
• Data Retention: > 200 years
• Page Write Mode: 64 bytes
• Write Protection: Hardware-based

Detailed Pin Configuration

The 25LC040A-M/SN has a total of 8 pins arranged as follows:

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| | | 1 8 | | | | 2 7| | | | 3 6| | | | 4 5 | |___________| ```

1. Chip Select (CS) - Active low input for device selection.
2. Serial Clock (SCK) - Input for synchronizing data transfer.
3. Serial Data Input (SI) - Input for receiving data from the microcontroller.
4. Serial Data Output (SO) - Output for transmitting data to the microcontroller.
5. Write Protect (WP) - Input for hardware write protection.
6. VSS - Ground reference.
7. VCC - Supply voltage.
8. HOLD - Input for suspending serial communication.

Functional Features

• Non-volatile memory: The 25LC040A-M/SN retains data even when power is disconnected.
• SPI compatibility: It supports a standard serial interface for easy integration with microcontrollers.
• Self-timed erase and write cycles: The chip manages the timing of erase and write operations, simplifying the control process.
• High endurance: With 1,000,000 erase/write cycles, it ensures reliable and long-lasting data storage.
• Low power consumption: The IC operates efficiently, minimizing power usage in battery-powered devices.
• Hardware write protection: The write protect pin allows users to enable or disable write operations, preventing accidental data modification.

Advantages and Disadvantages

Advantages: - Compact size enables use in space-constrained applications. - High endurance ensures data reliability over an extended period. - Low power consumption prolongs battery life. - SPI compatibility simplifies integration with microcontrollers. - Hardware write protection enhances data security.

Disadvantages: - Limited memory capacity (4K bits). - Slower data transfer rate compared to some other memory technologies. - Susceptible to electromagnetic interference due to its small form factor.

Working Principles

The 25LC040A-M/SN utilizes non-volatile memory technology to store data. It employs a serial peripheral interface (SPI) for communication with a microcontroller. The chip supports self-timed erase and write cycles, allowing the user to easily update or modify stored data.

During operation, the microcontroller selects the 25LC040A-M/SN by asserting the Chip Select (CS) pin. It then sends commands and data through the Serial Clock (SCK) and Serial Data Input (SI) pins. The chip responds by transmitting data back to the microcontroller through the Serial Data Output (SO) pin.

The Write Protect (WP) pin provides hardware-based write protection, allowing users to enable or disable write operations. This feature prevents accidental modification of stored data.

Detailed Application Field Plans

The 25LC040A-M/SN is widely used in various electronic devices that require non-volatile memory storage. Some potential application fields include:

1. Consumer Electronics: Used in smart TVs, set-top boxes, and audio systems for storing configuration settings, user preferences, and firmware updates.
2. Automotive: Employed in car infotainment systems, instrument clusters, and engine control units (ECUs) to store critical data such as