24LC21A-I/P

Product Overview

Category: Integrated Circuit (IC)

Use: Non-volatile Electrically Erasable Programmable Read-Only Memory (EEPROM)

Characteristics: - Low power consumption - High reliability - Small form factor - Wide operating voltage range - I2C compatible interface

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

Essence: The 24LC21A-I/P is a small-sized EEPROM IC that provides non-volatile storage capabilities for various electronic devices.

Packaging/Quantity: The 24LC21A-I/P is typically sold in reels of 1,000 units.

Specifications

• Memory Size: 2 kilobits (256 bytes)
• Operating Voltage Range: 2.5V to 5.5V
• Maximum Clock Frequency: 400 kHz
• Write Cycle Time: 5 ms (maximum)
• Data Retention: 200 years (minimum)
• Endurance: 1,000,000 write cycles (minimum)

Detailed Pin Configuration

The 24LC21A-I/P has a total of 8 pins arranged as follows:

```

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| | | 24LC | | | |___________|

1 2 3 4

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| | | | | | |___________| 5 6 7 8 ```

Pin Description: 1. VCC: Power supply voltage input 2. SDA: Serial data line (I2C bus) 3. SCL: Serial clock line (I2C bus) 4. WP: Write protect pin (optional) 5. NC: No connection 6. GND: Ground 7. A0: Address input bit 0 8. A1: Address input bit 1

Functional Features

• Non-volatile storage: The 24LC21A-I/P retains data even when power is removed.
• I2C interface: Allows for easy integration with microcontrollers and other devices supporting the I2C protocol.
• Write protection: The WP pin can be used to protect the memory from accidental writes.
• Low power consumption: Ideal for battery-powered applications.

Advantages and Disadvantages

Advantages: - Small form factor enables space-efficient designs. - High reliability ensures data integrity. - Wide operating voltage range allows compatibility with various systems. - I2C interface simplifies communication with other devices.

Disadvantages: - Limited memory size may not be suitable for applications requiring larger storage capacity. - Write cycle time of 5 ms may be slower compared to some other EEPROMs. - Lack of additional features such as built-in security mechanisms.

Working Principles

The 24LC21A-I/P utilizes electrically erasable programmable read-only memory (EEPROM) technology. It stores data by trapping electric charges in a floating gate, which can be erased and reprogrammed using electrical signals. The I2C interface facilitates communication between the IC and external devices, allowing for easy reading and writing of data.

Detailed Application Field Plans

The 24LC21A-I/P finds application in various electronic systems that require non-volatile storage capabilities within a limited memory size. Some potential application fields include: - Consumer electronics (e.g., smart appliances, remote controls) - Industrial automation (e.g., sensor calibration data storage) - Automotive electronics (e.g., configuration settings, mileage tracking)

Detailed and Complete Alternative Models

Some alternative models to the 24LC21A-I/P that offer similar functionality are: - 24LC02B-I/P: 2 kilobit EEPROM with I2C interface - 24LC32A-I/P: 32 kilobit EEPROM with I2C interface - 24LC256-I/P: 256 kilobit EEPROM with I2C interface

These alternative models provide different memory sizes to cater to varying application requirements.

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