24256

Technical Summary: 24256 I2C-Compatible EEPROM

Overview

The 24256 is a high-performance, I2C-compatible Electrically Erasable Programmable Read-Only Memory (EEPROM) designed for non-volatile data storage in a wide range of applications. With a storage capacity of 256 Kbits (32 Kbytes), this device provides reliable and efficient data retention with low power consumption. The 24256 is ideal for applications requiring frequent read/write operations, offering fast access times and robust endurance.

This EEPROM supports the I2C (Inter-Integrated Circuit) protocol, enabling seamless communication with microcontrollers and other peripheral devices. Its electrically erasable feature allows for in-circuit reprogramming, making it suitable for firmware updates, configuration storage, and data logging.

Features

• Memory Capacity: 256 Kbits (32 Kbytes) organized as 32,768 x 8 bits.
• I2C Interface: Supports standard (100 kHz) and fast (400 kHz) I2C modes.
• Low Power Consumption: Active current of 1 mA (typical) and standby current of 1 µA (typical).
• High Endurance: 1,000,000 write cycles per byte.
• Long Data Retention: 100 years at 25°C.
• Wide Voltage Range: Operates from 1.7V to 5.5V, compatible with 3.3V and 5V systems.
• Page Write Mode: Supports 64-byte page writes for efficient data storage.
• Hardware Write Protection: WP pin enables protection against accidental writes.
• Temperature Range: Industrial-grade operation from -40°C to +85°C.

Applications

The 24256 EEPROM is widely used in various electronic systems requiring non-volatile memory storage. Key applications include:

• Consumer Electronics: Smartphones, tablets, and wearables for storing user settings and calibration data.
• Automotive Systems: Infotainment systems, instrument clusters, and engine control units (ECUs) for parameter storage.
• Industrial Automation: Programmable logic controllers (PLCs) and sensors for configuration and logging.
• Medical Devices: Patient monitoring systems and portable medical equipment for data retention.
• IoT Devices: Edge devices and smart sensors for firmware and configuration storage.

Electrical Characteristics

The following table summarizes the key electrical specifications of the 24256 EEPROM:

• Supply Voltage (V_CC): 1.7V to 5.5V
• Operating Current (Active): 1 mA (typical) at 100 kHz
• Standby Current: 1 µA (typical)
• Input/Output Capacitance: 8 pF (max)
• Write Cycle Time: 5 ms (max) per byte or page
• Clock Frequency: 100 kHz (standard mode), 400 kHz (fast mode)
• Input Logic Levels:
  • V_IL (Low-Level Input Voltage): 0.3V_CC (max)
  • V_IH (High-Level Input Voltage): 0.7V_CC (min)

Package Information

The 24256 is available in multiple industry-standard packages, providing flexibility for different PCB layouts and space constraints. The following packages are commonly offered:

• 8-lead SOIC (208 mil): Small Outline Integrated Circuit, suitable for space-constrained applications.
• 8-lead PDIP (300 mil): Plastic Dual In-line Package, ideal for prototyping and through-hole mounting.
• 8-lead TSSOP: Thin Shrink Small Outline Package, optimized for high-density PCB designs.
• 8-lead UDFN: Ultra-Thin Dual Flat No-Lead package, offering minimal footprint for compact devices.

Each package option ensures reliable performance across the specified temperature range and is compliant with RoHS (Restriction of Hazardous Substances) standards.

Functional Description

The 24256 operates as a slave device on the I2C bus, responding to commands from a master device (e.g., a microcontroller). Key functional aspects include:

• Device Addressing: The 24256 supports a 7-bit slave address, with three configurable address pins (A0, A1, A2) for bus arbitration.
• Write Operations: Supports both byte write and page write modes. Page writes allow up to 64 bytes to be written in a single operation.
• Read Operations: Supports sequential read for efficient data retrieval. The internal address pointer auto-increments after each read.
• Acknowledge Polling: The master can poll the device to determine when a write cycle is complete.

Conclusion

The 24256 I2C-compatible EEPROM is a versatile and reliable solution for non-volatile data storage in a broad range of applications. Its combination of high endurance, low power consumption, and flexible packaging makes it an excellent choice for designers seeking robust memory solutions. With support for standard and fast I2C modes, the 24256 ensures seamless integration into modern electronic systems.