24LC64-E/ST

Memory IC Overview

The Microchip Technology 24LC64-E/ST is a 64-Kbit (8K x 8) serial Electrically Erasable PROM featuring an I2C-compatible two-wire interface. It operates on a single supply voltage ranging from 2.5V to 5.5V and supports clock frequencies up to 400 kHz. The device utilizes low-power CMOS technology, ensuring standby current of 1 µA maximum and active current of 3 mA maximum. It includes hardware write protection via the WP pin, a 32-byte page write buffer, and Schmitt trigger inputs for noise suppression.

Memory IC Feature Summary

• Supports bidirectional data transfer using a standard two-wire serial bus protocol with I2C compatibility.
• Features a 32-byte page write buffer to optimize write operations and reduce cycle time.
• Includes hardware write protection controlled by the WP pin to prevent accidental data modification.
• Provides high reliability with over one million erase/write cycles and more than 200 years of data retention.

Memory IC Applications

• Data acquisition systems requiring non-volatile storage
• Personal communication devices
• Industrial control applications

Memory IC Procurement Notes

Verify that the ordering suffix 'E' corresponds to the Extended temperature range (-40°C to +125°C) as specified in the datasheet. Confirm the 'ST' suffix indicates the 8-lead TSSOP package. Ensure the application voltage remains above 2.5V to maintain the specified 400 kHz clock frequency. Check for RoHS compliance status if required by specific manufacturing standards.

Memory IC Selection Notes

Select this component when an I2C interface is required for non-volatile memory storage in space-constrained designs. The 24LC64-E/ST is suitable for applications operating within the extended industrial temperature range. Consider the 32-byte page write capability for efficient data logging. Ensure the system design accommodates the open-drain nature of the SDA line with appropriate pull-up resistors.

Memory IC Part Context

The 24LC64 belongs to the Microchip 24XX64 family of 64-Kbit serial EEPROMs. This family shares a common architecture but varies in supply voltage ranges and clock speeds across the 24AA64, 24FC64, and 24LC64 variants. The 24LC64 specifically targets applications requiring operation down to 2.5V, distinguishing it from the lower-voltage 24AA64 and higher-speed 24FC64 options.

Memory IC Replacement Considerations

Direct replacements include other 24LC64 variants with different packages or temperature ratings, such as 24LC64-I/SN or 24LC64T-E/MNY. Cross-family substitutes like 24AA64 or 24FC64 require verification of voltage and speed compatibility. Ensure any substitute maintains the same I2C addressing scheme and package footprint if board space is constrained.