Technical Summary: 24256 A I2C-Compatible EEPROM

Overview

The 24256 A 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 KB), this component provides reliable and efficient data retention with low power consumption. Its I2C serial interface ensures easy integration into microcontroller-based systems, making it ideal for embedded applications requiring frequent read/write operations.

The 24256 A supports a wide operating voltage range and features hardware write protection, ensuring data integrity in noisy or unstable environments. Its endurance and retention characteristics make it suitable for industrial, automotive, and consumer electronics applications where long-term data storage is critical.

Features

• Memory Capacity: 256 Kbits (32 KB) organized as 32,768 x 8 bits
• I2C-Compatible Interface: Supports standard (100 kHz) and fast (400 kHz) modes
• Wide Voltage Range: Operates from 1.7V to 5.5V, making it compatible with 3.3V and 5V systems
• High Endurance: 1,000,000 write cycles per byte
• Long Data Retention: 100 years at 25°C
• Hardware Write Protection: WP pin enables protection of the entire memory array
• Low Power Consumption: Active current of 1 mA (typical), standby current of 1 µA (typical)
• Page Write Mode: Allows up to 64 bytes to be written in a single operation
• Industrial Temperature Range: -40°C to +85°C
• Packaging Options: Available in 8-pin PDIP, SOIC, and TSSOP packages

Applications

The 24256 A is widely used in applications requiring reliable non-volatile memory storage with serial interface compatibility. Key application areas include:

• Embedded Systems: Configuration storage, firmware updates, and parameter retention
• Automotive Electronics: Event logging, sensor calibration, and infotainment systems
• Consumer Electronics: Smart appliances, wearables, and IoT devices
• Industrial Control: Data logging, equipment settings, and factory automation
• Medical Devices: Patient data storage and device configuration
• Telecommunications: Network equipment configuration and backup storage

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (V_CC): -0.6V to +6.5V
• Input Voltage (V_IN): -0.6V to V_CC + 0.6V
• Storage Temperature: -65°C to +150°C
• Operating Temperature: -40°C to +85°C

DC Characteristics (V_CC = 1.7V to 5.5V, T_A = 25°C)

• Supply Current (Read): 1 mA (typical)
• Supply Current (Write): 2 mA (typical)
• Standby Current: 1 µA (typical)
• Input Low Voltage (V_IL): 0.3V_CC (max)
• Input High Voltage (V_IH): 0.7V_CC (min)

AC Characteristics

• Clock Frequency (f_SCL): 100 kHz (Standard Mode), 400 kHz (Fast Mode)
• Clock Low Period (t_LOW): 4.7 µs (Standard Mode), 1.3 µs (Fast Mode)
• Clock High Period (t_HIGH): 4.0 µs (Standard Mode), 0.6 µs (Fast Mode)
• Start Condition Hold Time (t_HD;STA): 4.0 µs (Standard Mode), 0.6 µs (Fast Mode)
• Data Hold Time (t_HD;DAT): 0 µs (min), 3.45 µs (max)

Package Information

8-Pin PDIP (Plastic Dual In-Line Package)

• Dimensions: 9.81 mm x 6.35 mm
• Pin Pitch: 2.54 mm
• Lead Material: Alloy 42 or copper

8-Pin SOIC (Small Outline Integrated Circuit)

• Dimensions: 5.00 mm x 4.00 mm
• Pin Pitch: 1.27 mm
• Lead Material: Copper alloy

8-Pin TSSOP (Thin Shrink Small Outline Package)

• Dimensions: 3.00 mm x 4.40 mm
• Pin Pitch: 0.65 mm
• Lead Material: Copper alloy

Conclusion

The 24256 A I2C-compatible EEPROM is a versatile and reliable solution for non-volatile data storage in a variety of applications. Its combination of high endurance, long data retention, and low power consumption makes it an excellent choice for designers seeking a robust memory solution. With multiple packaging options and wide voltage compatibility, the 24256 A is well-suited for both industrial and consumer applications.