24AA256-I/ST

Memory IC Overview

The Microchip Technology 24AA256-I/ST is a 32K x 8 (256 Kbit) Serial Electrically Erasable PROM (EEPROM). It operates across a broad voltage range of 1.7V to 5.5V with a maximum clock frequency of 400 kHz for the Industrial temperature grade (-40°C to +85°C). The device features a Two-Wire Serial Interface compatible with I²C protocols, supporting both random and sequential reads up to the 256K boundary. It includes a 64-byte page write buffer and hardware write-protect functionality via the WP pin.

Memory IC Feature Summary

• Low-Power CMOS technology enabling operation down to 1.7V
• Two-Wire Serial Interface compatible with I²C protocol
• Hardware Write-Protect capability via the WP pin
• Supports cascading up to eight devices on the same bus

Memory IC Applications

• Personal communications systems
• Data acquisition applications
• Advanced low-power electronic designs

Memory IC Procurement Notes

Verify the specific suffix 'I' confirms the Industrial temperature range (-40°C to +85°C) and 'ST' denotes the TSSOP package. Confirm that the operating voltage requirements align with the 1.7V minimum specification for the 24AA256 series. Ensure ESD protection measures are adequate given the >4000V rating.

Memory IC Selection Notes

Select this component when a 256Kbit non-volatile memory solution is required with I²C interface compatibility. It is suitable for designs needing hardware write protection and low standby current. Consider the TSSOP package constraints and ensure the system voltage supports the 1.7V to 5.5V operational range.

Memory IC Part Context

This part belongs to the 24XX256 family, which includes the 24LC256 and 24FC256 variants. While sharing similar architecture, the 24AA256 specifically supports operation down to 1.7V, unlike the 24LC256 which requires a minimum of 2.5V. The 24FC256 offers higher speed capabilities up to 1 MHz.

Memory IC Replacement Considerations

Direct substitutes within the same package and electrical specifications include other 24AA256 variants with different suffixes for temperature or packaging, such as 24AA256-E/ST for extended temperature.