24AA52-I/ST

Memory IC Overview

The Microchip Technology 24AA52-I/ST is a 2 Kbit Electrically Erasable PROM organized as 256 x 8 bits. It operates on a single supply voltage ranging from 1.8V to 5.5V and utilizes a 2-Wire Serial Interface Bus compatible with I²C™. The device supports a maximum clock frequency of 400 kHz for VCC between 2.2V and 5.5V, and 100 kHz for VCC below 2.5V. It features software write protection for the lower 128 bytes and hardware write protection for the entire array via the WP pin. The component is housed in an 8-lead TSSOP package and is rated for industrial temperature operation from -40°C to +85°C.

Memory IC Feature Summary

• Features dual write protection mechanisms including permanent software protection for the lower half of the memory array and external hardware protection for the entire array.
• Incorporates Schmitt trigger inputs and filter circuits on SCL and SDA lines to suppress noise spikes and ensure reliable data transmission.
• Includes output slope control logic designed to eliminate ground bounce during high-speed switching operations.
• Supports acknowledge polling to maximize bus throughput by allowing the master to detect when internal write cycles are complete.

Memory IC Applications

• Personal communication devices requiring low-power non-volatile storage
• Data acquisition systems needing reliable parameter retention
• Industrial control applications operating within standard temperature ranges

Memory IC Procurement Notes

Verify that the ordering suffix corresponds to the TSSOP-8 package type and Industrial (-I) temperature grade. Confirm RoHS compliance status if lead-free finishes are required for specific manufacturing processes. Ensure the design accounts for the specific voltage thresholds governing clock frequency limitations below 2.5V.

Memory IC Selection Notes

Select this component for designs requiring a broad voltage range down to 1.8V with moderate data density. Consider the page write buffer capability for efficient data handling. Evaluate the need for hardware versus software write protection based on system security requirements. Ensure the application environment remains within the specified industrial temperature limits.

Memory IC Part Context

This device belongs to the 24XXX52 series of serial EEPROMs manufactured by Microchip Technology. The series includes variants such as the 24LCS52 which shares similar functional characteristics but may differ in voltage or speed specifications. The 24AA52 specifically targets low-voltage applications while maintaining compatibility with standard I²C protocols.

Memory IC Replacement Considerations

The 24LC52 is a direct functional substitute within the same family offering identical memory organization and interface protocols. Verify voltage range compatibility as the 24LC52 typically requires a minimum of 2.5V compared to the 24AA52's 1.8V minimum.

Memory IC FAQ

How does the hardware write protect pin function?

Tying the WP pin to VCC enables hardware write protection for the entire array, preventing any writes regardless of the software write-protect register status. Tying it to VSS disables this hardware lock.

What is the behavior of the address pointer during a page write?

During a page write, the four lower order address pointer bits increment internally for each byte received. If more than 16 bytes are transmitted before a Stop condition, the address counter rolls over, causing new data to overwrite existing data in the current page.