24LC21-I/P

Product Overview

Category

The 24LC21-I/P belongs to the category of electrically erasable programmable read-only memory (EEPROM) chips.

Use

This product is commonly used for non-volatile data storage in various electronic devices, such as microcontrollers, computers, and consumer electronics.

Characteristics

• Electrically erasable: The 24LC21-I/P can be erased and reprogrammed electronically, making it convenient for updating stored data.
• Non-volatile: The stored data remains intact even when power is removed.
• Low power consumption: This chip operates at low power levels, making it suitable for battery-powered devices.
• High reliability: The 24LC21-I/P offers robust performance and long-term data retention.

Package

The 24LC21-I/P is available in a DIP-8 package, which consists of eight pins arranged in a dual in-line configuration.

Essence

The essence of the 24LC21-I/P lies in its ability to store and retrieve digital information reliably and efficiently.

Packaging/Quantity

This product is typically packaged in reels or tubes, with each reel or tube containing a specific quantity of chips. The exact packaging and quantity may vary depending on the manufacturer.

Specifications

• Memory capacity: 2 kilobits (256 bytes)
• Operating voltage: 1.7V to 5.5V
• Data transfer rate: Up to 400 kHz (I2C-compatible)
• Write endurance: 1 million write cycles
• Data retention: Up to 200 years

Detailed Pin Configuration

The 24LC21-I/P has the following pin configuration:

```

---

| | | 1 2 3 4| |____________|

1. A0: Address input bit 0
2. A1: Address input bit 1
3. VSS: Ground (0V)
4. SDA: Serial data input/output ```

Functional Features

• Random access: The 24LC21-I/P allows for direct access to any memory location, enabling efficient data retrieval.
• Byte-level read/write: Data can be written or read at the byte level, providing flexibility in managing stored information.
• Hardware write protection: This chip includes a write protection mechanism that prevents accidental modification of stored data.

Advantages and Disadvantages

Advantages

• Easy to use and integrate into electronic systems
• Low power consumption extends battery life
• High reliability ensures data integrity
• Compact package size facilitates space-constrained designs

Disadvantages

• Limited storage capacity compared to other memory technologies
• Relatively slower data transfer rate compared to some alternatives

Working Principles

The 24LC21-I/P utilizes an electrically controlled floating gate to store and retrieve digital information. When writing data, an electrical charge is applied to the floating gate, altering its conductivity and storing the desired information. During reading, the charge state of the floating gate is measured, allowing the stored data to be retrieved.

Detailed Application Field Plans

The 24LC21-I/P finds applications in various fields, including:

1. Embedded systems: Used for storing configuration data, firmware updates, and user settings in microcontroller-based systems.
2. Consumer electronics: Employed in devices like smart TVs, set-top boxes, and audio equipment for storing user preferences and system parameters.
3. Industrial automation: Utilized for storing calibration data, sensor configurations, and production parameters in industrial control systems.
4. Automotive electronics: Integrated into automotive modules for storing critical data, such as vehicle identification numbers and mileage records.

Detailed and Complete Alternative Models

Some alternative models to the 24LC21-I/P include:

1. 24LC01B: 1 kilobit EEPROM chip with similar characteristics and package.
2. 24LC256: 256 kilobit EEPROM chip with higher storage capacity but similar functionality.
3. AT24C02: EEPROM chip from Atmel with comparable specifications and pin configuration.

These alternative models offer different memory capacities and may have slight variations in features, but they serve similar purposes and can be used as substitutes for the 24LC21-I/P.

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