24AA256-I/MS

Memory IC Overview

The Microchip Technology 24AA256-I/MS is a 256 Kbit (32K x 8) serial EEPROM featuring 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 utilizes an 8-lead MSOP package and functions across an industrial temperature range of -40°C to +85°C. Key electrical characteristics include a maximum write current of 3 mA, standby current of 1 µA, and data retention exceeding 200 years.

Memory IC Feature Summary

• Supports page write operations with a 64-byte buffer for efficient data storage.
• Includes hardware write protection via the WP pin to secure memory arrays.
• Features Schmitt trigger inputs and output slope control for noise suppression and ground bounce elimination.

Memory IC Applications

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

Memory IC Procurement Notes

Verify that the specific ordering suffix matches the required package type and temperature grade. Confirm that the voltage range requirements align with the 1.7V minimum specification for the 24AA256 variant. Ensure compatibility with the host system's I²C pull-up resistor values for the intended clock frequency.

Memory IC Selection Notes

Select this component when a broad voltage range starting from 1.7V is necessary, distinguishing it from the 2.5V minimum 24LC256 series. The MSOP package is suitable for surface-mount designs requiring compact footprints. Consider the 400 kHz speed limit if operating above 2.5V, as lower voltages restrict performance to 100 kHz.

Memory IC Part Context

This part belongs to the 24XX256 family of 256-Kbit Serial Electrically Erasable PROMs. It shares functional similarities with the 24LC256 and 24FC256 but differs in minimum operating voltage and maximum clock frequency specifications. The 'I' suffix denotes the industrial temperature range, while 'MSOP' identifies the specific micro-small outline package geometry.

Memory IC Replacement Considerations

The 24LC256-I/MS serves as a direct physical replacement but requires a minimum supply voltage of 2.5V instead of 1.7V. The 24FC256 offers higher speed capabilities but also has specific voltage-dependent frequency limitations. Verify voltage headroom before substituting these variants.