24LC64-E/MS

Memory IC Overview

The Microchip Technology 24LC64-E/MS 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 features a two-wire I2C compatible serial interface with a maximum clock frequency of 400 kHz. The device supports page write operations with a 32-byte buffer and includes hardware write protection via the WP pin. It is housed in an 8-lead MSOP package and is qualified for extended temperature operation from -40°C to +125°C.

Memory IC Feature Summary

• Supports cascading up to eight devices on the same bus using three functional address pins (A0, A1, A2).
• Includes Schmitt trigger inputs and output slope control to suppress noise and eliminate ground bounce.
• Features self-timed erase/write cycles with a maximum page write time of 5 ms.

Memory IC Applications

• Data logging applications requiring non-volatile storage.
• Configuration data storage in industrial systems.
• User data retention in embedded controllers.

Memory IC Procurement Notes

Verify that the ordering suffix 'E' corresponds to the Extended temperature range (-40°C to +125°C) and 'MS' indicates the 8-lead MSOP package. Confirm RoHS compliance status and ensure the specific datasheet revision matches the design requirements. Check for any recent Product Change Notifications regarding assembly or material changes.

Memory IC Selection Notes

Select this component when an I2C interface is required with a minimum operating voltage of 2.5V. The Extended temperature grade is necessary for environments exceeding standard industrial limits. Ensure the application utilizes the 32-byte page write buffer efficiently to optimize bus throughput and manage write cycle endurance effectively.

Memory IC Part Context

This part belongs to the 24LC64 series within the broader 24XX64 family, which also includes the 24AA64 and 24FC64 variants. While sharing the same memory architecture and interface, the 24LC64 is distinguished by its 2.5V minimum operating voltage compared to the 1.7V support found in other family members.

Memory IC Replacement Considerations

The 24LC64-I/MS serves as the Industrial temperature variant replacement. Other packages such as SOIC (SN), PDIP (P), and TSSOP are available within the same electrical specification.

Memory IC FAQ

How does the Write Protect (WP) pin function?

Tying the WP pin to VCC inhibits all write operations while allowing reads. Tying it to VSS enables write operations. The pin state is sampled at the Stop bit of every write command.

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

If a page write attempts to cross a boundary, the data wraps around to the beginning of the current page, overwriting existing data instead of proceeding to the next page.