24AA64-E/SM

Memory IC Overview

The Microchip Technology 24AA64-E/SM is a 64-Kbit Electrically Erasable PROM organized as an 8K x 8-bit memory block. It features a two-wire I2C compatible serial interface and operates on a single supply voltage ranging from 1.7V to 5.5V. The device supports clock frequencies up to 400 kHz for VCC levels between 2.5V and 5.5V, and 100 kHz for voltages below 2.5V. It includes a 32-byte page write buffer and hardware write protection via the WP pin. The component is qualified for extended temperature operation from -40°C to +125°C and is housed in an 8-lead MSOP package.

Memory IC Feature Summary

• Supports bidirectional data transfer using a standard two-wire serial bus protocol with Schmitt trigger inputs for noise suppression.
• Features a 32-byte page write buffer that allows efficient sequential data storage within a single physical page boundary.
• Includes hardware write protection controlled by the WP pin to inhibit array writes while maintaining read functionality.
• Provides output slope control to eliminate ground bounce during switching operations.

Memory IC Applications

• Data logging applications requiring non-volatile storage of sensor readings or system parameters.
• Configuration storage for microcontroller-based systems needing persistent settings across power cycles.
• Identification and calibration data retention in industrial instrumentation.
• Smart card and security token implementations utilizing hardware write protection.

Memory IC Procurement Notes

Verify the specific ordering suffix corresponds to the MSOP package and Extended temperature grade. Confirm RoHS compliance status and automotive qualification requirements if applicable. Check for recent Product Change Notifications regarding packaging or material updates. Ensure the supplier provides valid traceability documentation for the manufacturing lot code.

Memory IC Selection Notes

Select this part when low-voltage operation down to 1.7V is required alongside extended temperature range capabilities. Compare against the 24LC64 variant if the application strictly requires a minimum 2.5V supply. Consider the 24FC64 series if higher clock speeds up to 1 MHz are necessary for faster bus throughput. Evaluate package availability constraints between MSOP and other form factors like TSSOP or DFN.

Memory IC Part Context

This component belongs to the 24XX64 family of 64-Kbit I2C Serial EEPROMs manufactured by Microchip Technology. The family shares identical functional architectures but differs in voltage ranges and speed grades. The 'AA' designation indicates support for operation down to 1.7V, distinguishing it from the 2.5V minimum 24LC64 series. The 'E' suffix denotes the extended industrial temperature rating.

Memory IC Replacement Considerations

Direct substitutes include other 24AA64 variants with different packages such as 24AA64-I/ST or 24AA64-I/SN, provided the temperature grade matches the design requirements. Cross-referencing with 24LC64 devices is possible only if the system voltage remains above 2.5V.