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ST24LC21B

Manufacturer: STMicroelectronics

1KB (X8) DUAL MODE SERIAL EEPROM FOR VESA PLUG & PLAY

Partnumber Manufacturer Quantity Availability
ST24LC21B STMicroelectronics 755 In Stock

Description and Introduction

1KB (X8) DUAL MODE SERIAL EEPROM FOR VESA PLUG & PLAY The **ST24LC21B** is a serial EEPROM manufactured by **STMicroelectronics**. Below are its specifications, descriptions, and features based on factual information:

### **Specifications:**
- **Memory Size:** 2 Kbit (256 x 8 bits)  
- **Interface:** I²C (Two-wire serial interface)  
- **Supply Voltage (VCC):** 1.8V to 5.5V  
- **Operating Temperature Range:** -40°C to +85°C  
- **Write Cycle Time:** 5 ms (max)  
- **Write Endurance:** 1 million cycles  
- **Data Retention:** 40 years  
- **Package Options:** SO8, TSSOP8  

### **Descriptions:**
- The **ST24LC21B** is a low-voltage, low-power EEPROM with I²C-compatible serial communication.  
- It supports byte and page write operations (up to 16 bytes per page).  
- Features a built-in write-protect function via the **WP (Write Protect)** pin.  

### **Features:**
- **Low Power Consumption:**  
  - Standby current: 1 µA (typical)  
  - Active current: 1 mA (typical at 100 kHz)  
- **I²C-Compatible Interface:**  
  - Supports standard (100 kHz) and fast (400 kHz) modes.  
- **Hardware Write Protection:**  
  - Prevents accidental writes when **WP** pin is connected to **VCC**.  
- **Extended Voltage Range:**  
  - Operates from **1.8V to 5.5V**, making it suitable for battery-powered applications.  
- **High Reliability:**  
  - Built-in error-checking and correction mechanisms.  

This information is strictly based on the manufacturer's datasheet for the **ST24LC21B** from **STMicroelectronics**.

Application Scenarios & Design Considerations

1KB (X8) DUAL MODE SERIAL EEPROM FOR VESA PLUG & PLAY

Alternative Part Number

  • 24LC21A-I/P --: Same 1Kbit I2C serial EEPROM with identical pinout and protocol; Microchip is the direct successor to ST's serial EEPROM line and widely available.
  • AT24C01C-SSHM-T --: 1Kbit I2C EEPROM from Atmel/Microchip AT24C series, functionally equivalent with compatible addressing and voltage range.
  • CAT24C01WI-GT3 --: 1Kbit I2C CMOS serial EEPROM with similar pinout and I2C interface, suitable drop-in alternative for low-density EEPROM designs.
  • AT24C21-10PC --: Equivalent 1Kbit I2C serial EEPROM in a DIP package, matching the original's interface and memory organization for direct substitution.
  • CAT24C21LI --: 1Kbit I2C serial EEPROM with compatible pinout and voltage range, suitable as a second-source alternative.

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