24AA52T-I/ST

Memory IC Overview

The Microchip Technology 24AA52T-I/ST is a 2 Kbit (256 x 8) Serial Electrically Erasable PROM featuring a 2-Wire I²C compatible interface. It operates on a single supply voltage ranging from 1.8V to 5.5V with typical active current of 1 mA and standby current of 1 µA. The device supports clock frequencies up to 400 kHz for VCC ≥ 2.2V, or 100 kHz when VCC is between 1.8V and 2.5V. It includes software write protection for the lower 128 bytes and hardware write protection via the WP pin. The component offers 1,000,000 erase/write cycles, data retention exceeding 200 years, and operates within an industrial temperature range of -40°C to +85°C.

Memory IC Feature Summary

• Features dual write protection mechanisms including permanent software protection for the lower half of the array and external hardware protection for the entire memory space.
• Supports high-speed serial communication with a maximum clock frequency of 400 kHz under standard operating voltages.
• Incorporates Schmitt trigger inputs and output slope control to suppress noise spikes and eliminate ground bounce effects.

Memory IC Applications

• Low-power data acquisition systems requiring non-volatile storage
• Personal communication devices utilizing I²C bus architectures
• Industrial control applications needing reliable parameter storage

Memory IC Procurement Notes

Verify that the specific suffix 'I' corresponds to the Industrial temperature grade (-40°C to +85°C) as defined in the datasheet selection table. Confirm the 'ST' suffix matches the required 8-lead SOIC package type. Ensure the application voltage remains above 2.2V if 400 kHz operation is required; otherwise, clock speeds are limited to 100 kHz at lower voltages.

Memory IC Selection Notes

Select this component for designs requiring low standby power consumption and robust noise immunity through Schmitt triggers. Consider the page write buffer capability for efficient data handling. Evaluate the need for hardware versus software write protection based on system security requirements. Verify compatibility with the master controller's I²C voltage levels and pull-up resistor configurations.

Memory IC Part Context

This device belongs to the 24XXX52 family of 2K-bit Serial EEPROMs manufactured by Microchip Technology. It shares functional similarities with the 24LC52 and 24FC52 variants but differs in minimum operating voltage and maximum clock frequency specifications. The family utilizes a standardized 8-pin package format common across Microchip's serial memory products.

Memory IC Replacement Considerations

The 24LC52 serves as a direct functional substitute within the same family, though it requires a minimum operating voltage of 2.2V compared to the 24AA52's 1.8V minimum. Both devices share identical pinouts and I²C protocols.

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 maximum clock frequency at low supply voltages?

When the supply voltage (VCC) is between 1.8V and 2.5V, the maximum clock frequency is limited to 100 kHz. At voltages of 2.2V and above, the device supports up to 400 kHz.