24AA128-I/ST

Memory IC Overview

The Microchip Technology 24AA128-I/ST is a 16K x 8 (128 Kbit) Serial Electrically Erasable PROM (EEPROM). It operates with a single supply voltage ranging from 1.7V to 5.5V and supports I2C compatible two-wire serial interface communication at clock frequencies up to 400 kHz. The device features a 64-byte page write buffer, hardware write-protect capability, and Schmitt trigger inputs for noise suppression. It is housed in an 8-lead TSSOP package and is rated for industrial temperature operation from -40°C to +85°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-protect functionality via the WP pin to inhibit write operations when tied to VCC.
• Features output slope control designed to eliminate ground bounce during switching.

Memory IC Applications

• Personal communications systems
• Data acquisition applications

Memory IC Procurement Notes

Verify that the specific ordering suffix corresponds to the required package type and temperature grade. Confirm that the voltage range requirements align with the 1.7V to 5.5V specification for the 24AA128 variant. Ensure compatibility with the I2C bus protocol and check for any specific factory programming requirements if applicable.

Memory IC Selection Notes

Select this component for low-power CMOS applications requiring non-volatile storage with I2C connectivity. Consider the 1.7V minimum operating voltage for battery-powered designs. Verify that the 400 kHz maximum clock frequency meets system timing constraints. Ensure the industrial temperature range of -40°C to +85°C covers the intended operating environment.

Memory IC Part Context

This part belongs to the 24XX128 family, which includes the 24LC128 and 24FC128 variants. The 24AA128 is distinguished by its ability to operate down to 1.7V, whereas the 24LC128 requires a minimum of 2.5V. The 24FC128 offers higher speed capabilities up to 1 MHz. All variants share similar pinouts and functional architectures.

Memory IC Replacement Considerations

The 24LC128-I/ST is a direct pin-compatible alternative within the same family, though it requires a minimum supply voltage of 2.5V instead of 1.7V. The 24FC128-I/ST offers increased speed but maintains the 1.7V lower voltage limit. Verify voltage specifications before substituting.