24LC128-I/SM

Memory IC Overview

The Microchip Technology 24LC128-I/SM 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 features an I2C compatible two-wire serial interface with a maximum clock frequency of 400 kHz. The device supports page write operations with a 64-byte buffer and includes hardware write protection via the WP pin. It is housed in an 8-lead MSOP package and functions within an industrial temperature range of -40°C to +85°C.

Memory IC Feature Summary

• Supports cascading up to eight devices on the same bus using configurable chip select inputs for expanded address space.
• Includes Schmitt trigger inputs for noise suppression and output slope control to eliminate ground bounce.
• Features a self-timed erase/write cycle with a maximum page write time of 5 ms.

Memory IC Applications

• Personal communications
• Data acquisition systems

Memory IC Procurement Notes

Verify that the specific ordering suffix corresponds to the MSOP package type, as other suffixes indicate different physical packages. Confirm the 'I' designation matches the required industrial temperature range specifications for your application environment.

Memory IC Selection Notes

Select this component when a 128 Kbit EEPROM with I2C compatibility is required. Ensure the system voltage remains above 2.5V, as lower voltages are not supported by this specific part variant compared to the 24AA128 series.

Memory IC Part Context

This device belongs to the 24XX128 family, which also includes the 24AA128 and 24FC128 variants. While sharing similar memory architecture and interface protocols, the 24LC128 is distinguished by its minimum operating voltage requirement of 2.5V, whereas other family members support operation down to 1.7V.

Memory IC Replacement Considerations

The 24LC128T-I/SM is a tape-and-reel version of the same electrical device. Other package options such as SOIC or TSSOP may serve as mechanical alternatives if pinout compatibility is maintained.

Memory IC FAQ

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

Up to eight 24LC128 devices can be connected to the same bus by utilizing the A0, A1, and A2 chip select pins for unique addressing.

What is the function of the WP pin?

The Write-Protect (WP) pin inhibits write operations when tied to VCC, while read operations remain unaffected. Tying it to VSS enables write access.