24AA256-E/P

Memory IC Overview

The Microchip 24AA256-E/P is a 256 Kbit (32K x 8) serial EEPROM featuring an I²C-compatible two-wire interface. It operates on a single supply voltage ranging from 1.7V to 5.5V and supports clock frequencies up to 400 kHz at voltages of 2.5V or higher, with 100 kHz operation below 2.5V. The device utilizes low-power CMOS technology, offering a maximum write current of 3 mA and standby current as low as 1 µA. It provides hardware write protection via the WP pin, supports page writes of up to 64 bytes, and ensures data retention exceeding 200 years with over one million erase/write cycles.

Memory IC Feature Summary

• Supports cascading up to eight devices on the same bus using functional address inputs A0, A1, and A2.
• Includes Schmitt trigger inputs for enhanced noise suppression and output slope control to eliminate ground bounce.
• Features a 64-byte page write buffer that allows efficient sequential data storage within physical page boundaries.
• Provides hardware write protection through the WP pin, which inhibits write operations when tied to VCC.

Memory IC Applications

• Personal communications systems requiring non-volatile data storage
• Data acquisition applications needing reliable parameter retention
• Embedded systems utilizing I²C bus architectures for configuration memory

Memory IC Procurement Notes

Verify the specific suffix 'E' confirms the extended temperature range (-40°C to +125°C) and the '/P' indicates the 8-lead PDIP package. Confirm RoHS compliance status in the latest datasheet revision. Ensure the application circuit includes appropriate pull-up resistors on SDA and SCL lines compatible with the selected clock frequency and supply voltage.

Memory IC Selection Notes

Select this component for designs requiring wide voltage operation down to 1.7V and robust data retention. The 24AA256 differs from the 24LC256 by supporting lower minimum voltages. Consider the 24FC256 if higher clock speeds up to 1 MHz are required at voltages above 2.5V. The PDIP package is suitable for through-hole prototyping or manufacturing environments.

Memory IC Part Context

The 24AA256 belongs to the 24XX256 family of 256-Kbit serial EEPROMs manufactured by Microchip Technology. This family shares identical memory architecture and interface protocols but varies in operating voltage ranges and maximum clock frequencies. The 24AA256 specifically targets low-voltage applications compared to the 2.5V minimum requirement of the 24LC256 variant.

Memory IC Replacement Considerations

The 24LC256 serves as a functional substitute but requires a minimum supply voltage of 2.5V instead of 1.7V. The 24FC256 offers higher speed capabilities up to 1 MHz but also has specific voltage-dependent frequency limitations. Package variations such as SOIC or TSSOP may require schematic adjustments for pin compatibility.