24LC64-I/ST

Memory IC Overview

The Microchip Technology 24LC64-I/ST is a 64-Kbit Electrically Erasable PROM organized as an 8K x 8-bit memory block. It operates on a single supply voltage ranging from 2.5V to 5.5V and supports I2C compatible two-wire serial communication with clock frequencies up to 400 kHz. The device features a 32-byte page write buffer, hardware write protection via the WP pin, and Schmitt trigger inputs for noise suppression. It is housed in an 8-lead TSSOP package and functions within an industrial temperature range of -40°C to +85°C.

Memory IC Feature Summary

• Supports bidirectional data transfer using a standard two-wire serial interface compatible with I2C protocols.
• Includes a 32-byte page write buffer to optimize data writing efficiency and reduce cycle times.
• Features hardware write protection that inhibits write operations when the WP pin is tied to VCC.
• Incorporates Schmitt trigger inputs on SDA and SCL pins to suppress noise spikes.

Memory IC Applications

• Industrial control systems requiring non-volatile data storage
• Power management circuits needing parameter retention
• Communication and network equipment for configuration storage

Memory IC Procurement Notes

Verify the specific suffix 'I/ST' corresponds to the Industrial temperature grade (-40°C to +85°C) and the 8-lead TSSOP surface-mount package. Confirm that the 2.5V minimum operating voltage requirement aligns with the target system's power supply rails, as this variant does not support operation below 2.5V unlike other members of the 24XX64 family.

Memory IC Selection Notes

Select this component when a 64-Kbit EEPROM with I2C compatibility is required for industrial environments. Ensure the design accommodates the 2.5V to 5.5V supply range and utilizes pull-up resistors appropriate for the 400 kHz clock frequency. Consider the 32-byte page boundary constraints during software development to prevent data overwrite errors.

Memory IC Part Context

This part belongs to the 24AA64/24FC64/24LC64 family of 64-Kbit serial EEPROMs. While sharing the same memory architecture and interface, the 24LC64 variant is distinguished by its 2.5V minimum operating voltage, whereas the 24AA64 and 24FC64 support operation down to 1.7V. The 'I' designation indicates the industrial temperature rating.

Memory IC Replacement Considerations

The 24LC64T-I/ST serves as a tape-and-reel replacement for the tube-packaged 24LC64-I/ST. Other package variants such as 24LC64-I/SN (SOIC) or 24LC64-I/P (PDIP) offer functional equivalence but require different footprint designs.

Memory IC FAQ

How many devices can be connected to the same I2C bus?

Up to eight 24LC64 devices can be cascaded on the same bus by utilizing the three chip address pins (A0, A1, A2) to create unique client addresses.

What happens if a page write crosses a physical page boundary?

If a page write command attempts to write across a physical page boundary, the data wraps around to the beginning of the current page instead of proceeding to the next page.