24AA256-E/SN

Memory IC Overview

The Microchip 24AA256-E/SN is a 256 Kbit (32K x 8) serial EEPROM utilizing an I²C-compatible two-wire interface. It operates within a supply voltage range of 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 features a 64-byte page write buffer, hardware write protection via the WP pin, and Schmitt trigger inputs for noise suppression. It is housed in an 8-lead SOIC package and rated for extended industrial temperatures from -40°C to +125°C.

Memory IC Feature Summary

• Supports cascading up to eight devices on a single bus using configurable chip select pins.
• Includes hardware write protection to inhibit array writes when the WP pin is tied high.
• Features output slope control to eliminate ground bounce during switching operations.

Memory IC Applications

• Personal communications systems requiring low-power non-volatile storage
• Data acquisition applications needing reliable parameter retention
• Embedded systems utilizing I²C bus architectures

Memory IC Procurement Notes

Verify that the ordering suffix 'SN' corresponds specifically to the 8-lead SOIC package type as documented in the manufacturer's selection table. Confirm the 'E' suffix indicates the extended temperature range (-40°C to +125°C). Ensure compatibility with the target system's I²C voltage levels, noting the 1.7V minimum operating threshold for this specific device variant.

Memory IC Selection Notes

Select this component when a 256 Kbit capacity is required with support for low-voltage operation down to 1.7V. The 400 kHz maximum clock frequency suits moderate-speed data logging needs. Consider the 8-lead SOIC package for surface-mount assembly requirements. Verify that the hardware write-protect feature aligns with the security requirements of the application design.

Memory IC Part Context

This part belongs to the 24AA256 series of 256-Kbit Serial Electrically Erasable PROMs manufactured by Microchip Technology. The series is designed for advanced, low-power applications and shares functional similarities with the 24LC256 and 24FC256, though voltage ranges and clock speeds vary across the family members.

Memory IC Replacement Considerations

The 24LC256 serves as a compatible alternative but requires a minimum supply voltage of 2.5V. The 24FC256 offers higher speed capabilities up to 1 MHz but may have different electrical characteristics. Verify package pinout compatibility before substitution.