24LC128T-E/SN

Memory IC Overview

The Microchip Technology 24LC128T-E/SN is a 16K x 8 (128 Kbit) Serial Electrically Erasable PROM (EEPROM). It operates on a single supply voltage ranging from 2.5V to 5.5V and supports a maximum clock frequency of 400 kHz via an I2C compatible two-wire serial interface. The device features Schmitt trigger inputs for noise suppression, hardware write protection, and output slope control to eliminate ground bounce. It offers a page write buffer of up to 64 bytes with a maximum write cycle time of 5 ms. The component is housed in an 8-lead SOIC package and is rated for extended industrial operating temperatures from -40°C to +125°C.

Memory IC Feature Summary

• Supports cascading up to eight devices on the same bus using functional address lines A0, A1, and A2.
• Includes hardware write protection controlled by the WP pin to inhibit write operations while maintaining read access.
• Features Schmitt trigger inputs on SDA and SCL pins to provide improved noise spike suppression.

Memory IC Applications

• Personal communications systems requiring low-power non-volatile data storage
• Data acquisition applications needing reliable parameter retention
• Embedded systems utilizing I2C interfaces for configuration memory

Memory IC Procurement Notes

Verify that the specific ordering suffix corresponds to the Extended temperature grade (-40°C to +125°C) and the SOIC-8 package type. Confirm the voltage range requirement matches the 2.5V minimum specification for the 24LC128 series, distinct from the 1.7V capability found in other variants within the same family.

Memory IC Selection Notes

Select this component when an I2C-compatible EEPROM with extended temperature capabilities is required. Ensure the system design accommodates the 2.5V minimum supply voltage constraint. Consider the 64-byte page write buffer size for optimizing write throughput in the target application architecture.

Memory IC Part Context

This part belongs to the 24XX128 family, which includes the 24AA128 and 24FC128 variants. While sharing the same 128 Kbit capacity and physical footprint, the 24LC128 is distinguished by its 2.5V minimum operating voltage and 400 kHz maximum clock speed, whereas other family members may support lower voltages or higher frequencies.

Memory IC Replacement Considerations

Direct substitutes within the same package and electrical specifications include the 24LC128-I/SN for industrial temperature ranges, or the 24LC128-E/MS for MSOP packaging. Cross-family replacements like the 24AA128 require verification of the lower voltage compatibility if the system operates below 2.5V.

Memory IC FAQ

How does the WP pin function regarding write protection?

Connecting the WP pin to VCC inhibits all write operations to the array, while connecting it to VSS enables them. Read operations remain unaffected regardless of the WP pin state.

What is the behavior during a page write operation near a page boundary?

If a page write command attempts to cross a physical page boundary, the data wraps around to the beginning of the current page instead of writing to the next page. Application software must prevent writes that cross these boundaries.