25LC040T-I/SN

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-bit - 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: SOIC (Small Outline Integrated Circuit)

Essence: The 25LC040T-I/SN is a non-volatile memory chip that provides reliable and long-term storage for digital information. It is commonly used in various electronic devices to store configuration settings, calibration data, and other critical information.

Packaging/Quantity: The 25LC040T-I/SN is typically sold in reels or tubes containing multiple units. The exact quantity may vary depending on the supplier.

Specifications

• Memory Size: 4Kbits (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: 100 years

Pin Configuration

The 25LC040T-I/SN has an 8-pin SOIC package with the following pinout:

```

---

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

Pin Description: 1. Chip Select (CS) - Input for selecting the device 2. Serial Clock (SCK) - Input for synchronizing data transfer 3. Serial Data Input/Output (SDI/SDO) - Bidirectional data line 4. Ground (GND) - Reference ground 5. NC - Not connected 6. Write Protect (WP) - Input for write protection 7. VCC - Supply voltage 8. Hold (HOLD) - Input for suspending serial communication

Functional Features

• Non-volatile memory: The 25LC040T-I/SN retains stored data even when power is disconnected.
• SPI interface: It uses a serial peripheral interface for easy integration with microcontrollers and other devices.
• Self-timed erase and write cycles: The chip manages the timing of erase and write operations, simplifying the programming process.
• Power-on/off data protection: The memory content remains intact during power transitions.
• 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 - Reliable and long-term storage solution

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

Working Principles

The 25LC040T-I/SN utilizes non-volatile memory technology based on electrically erasable programmable read-only memory (EEPROM). It stores digital information by trapping electrical charges within its memory cells. The SPI interface allows for easy communication between the chip and external devices, enabling read and write operations.

During write operations, the chip erases the targeted memory cells and then writes new data into them. The self-timed cycles ensure proper timing for these operations. The power-on/off data protection feature ensures that the memory content remains intact during power transitions, providing reliable data storage.

Detailed Application Field Plans

The 25LC040T-I/SN is widely used in various electronic devices and systems, including but not limited to: - Consumer electronics (e.g., TVs, set-top boxes, audio players) - Computer peripherals (e.g., printers, scanners) - Industrial control systems - Automotive electronics - Medical devices - IoT (Internet of Things) devices

In these applications, the 25LC040T-I/SN is utilized for storing configuration settings, calibration data, security keys, firmware updates, and other critical information that needs to be retained even when power is disconnected.

Detailed and Complete Alternative Models

• 25LC080C-I/SN: 8Kbits Serial EEPROM Memory with similar features but double the storage capacity.
• 25AA040A-I/MS: 4Kbits Serial EEPROM Memory with a different package (MSOP) and lower operating voltage range.
• 24LC04B-I/P: 4Kbits I2C Serial EEPROM Memory