24AA512-I/ST

Memory IC Overview

The Microchip Technology 24AA512-I/ST is a 512 Kbit (64K x 8) serial electrically erasable PROM featuring an I²C-compatible two-wire interface. It operates on a single supply voltage ranging from 1.7V to 5.5V, with a maximum clock frequency of 400 kHz at VCC ≥ 2.5V and 100 kHz at VCC < 2.5V. The device supports industrial temperature grades (-40°C to +85°C), includes hardware write protection via the WP pin, and offers data retention exceeding 200 years with over one million erase/write cycles.

Memory IC Feature Summary

• Supports cascading up to eight devices on a single bus using configurable chip select inputs for expanded address space.
• Features Schmitt trigger inputs and output slope control to suppress noise spikes and eliminate ground bounce.
• Includes a 128-byte page write buffer to optimize data transfer efficiency during write operations.
• Provides hardware-based write protection that inhibits array writes when the WP pin is tied to VCC.

Memory IC Applications

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

Memory IC Procurement Notes

Verify the specific suffix 'I/ST' corresponds to the Industrial temperature range and TSSOP-8 package. Confirm the datasheet revision matches the required electrical characteristics, particularly regarding the 1.7V minimum operating voltage unique to the 24AA512 series compared to other variants in the family.

Memory IC Selection Notes

Select this component for applications requiring operation down to 1.7V, as the 24LC512 variant requires a minimum of 2.5V. Ensure the system design accommodates the 400 kHz maximum clock speed at standard voltages. Consider the 128-byte page write limit when designing software drivers to prevent data rollover across page boundaries.

Memory IC Part Context

This part belongs to the 24XX512 family of 512 Kbit Serial EEPROMs manufactured by Microchip Technology. It shares functional similarities with the 24LC512 and 24FC512 but differs in voltage ranges and clock speeds. The 24AA512 specifically enables low-voltage operation starting at 1.7V, distinguishing it from the 2.5V minimum requirement of the 24LC512.

Memory IC Replacement Considerations

Public confirmed substitute part numbers: 24AA512T-I/ST (tape and reel version).

Memory IC FAQ

How does the Write Protect (WP) pin function?

When the WP pin is tied to VCC, write operations are inhibited while read operations remain unaffected. When tied to VSS, write protection is disabled, allowing normal write access.

What is the maximum clock frequency for the 24AA512?

The maximum clock frequency is 400 kHz when VCC is between 2.5V and 5.5V. At lower voltages (1.7V to <2.5V), the maximum frequency is limited to 100 kHz.