24LC1026T-I/ST

Memory IC Overview

The Microchip Technology 24LC1026T-I/ST is a 1024 Kbit (128K x 8) Serial Electrically Erasable PROM featuring an I²C compatible 2-wire serial interface. It operates within a voltage range of 2.5V to 5.5V and supports clock frequencies up to 400 kHz, with 100 kHz compatibility at lower voltages. The device includes a 128-byte page write buffer, hardware write-protect capability via the WP pin, and Schmitt trigger inputs for noise suppression. It offers over one million erase/write cycles and data retention exceeding 200 years, functioning reliably in industrial temperature ranges from -40°C to +85°C.

Memory IC Feature Summary

• Supports cascading up to four devices on the same bus using configurable chip select inputs A1 and A2.
• Includes hardware write protection that inhibits all write operations when the WP pin is tied high.
• Features output slope control designed to eliminate ground bounce during switching events.

Memory IC Applications

• Personal communications systems requiring non-volatile data storage
• Data acquisition applications needing reliable parameter logging
• Embedded systems utilizing I²C bus architectures

Memory IC Procurement Notes

Verify the specific suffix 'I/ST' against official Microchip documentation to confirm the Industrial temperature grade (-40°C to +85°C) and SOIC package type. Ensure the source document explicitly lists this exact part number variant to avoid confusion with other temperature grades or package styles within the 24LC1026 family.

Memory IC Selection Notes

Select this component when an I²C EEPROM with 1 Mbit capacity is required for industrial environments. It is suitable for designs operating between 2.5V and 5.5V where hardware write protection and high endurance are critical. Consider the 128-byte page buffer for efficient bulk data writing compared to byte-write-only alternatives.

Memory IC Part Context

This device belongs to the 24XX1026 family, which also includes the 24AA1026 and 24FC1026 variants. While sharing identical memory architecture and interface protocols, these variants differ in supply voltage ranges and maximum clock speeds. The 24LC1026 specifically targets the 2.5V to 5.5V operational window with 400 kHz clock support.

Memory IC Replacement Considerations

Direct functional substitutes within the same family include the 24AA1026 and 24FC1026, provided voltage and speed requirements align. Verify pinout compatibility and ensure the replacement part matches the required temperature rating and package style for direct board replacement.

Memory IC FAQ

How does the block select bit B0 affect memory access?

The block select bit B0 acts as address bit A16, allowing access to either of the two 512K-bit segments within the 1Mbit array. Sequential reads are limited to these 512K boundaries.

What happens if a page write crosses a physical 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, overwriting previously stored data instead of proceeding to the next page.