24AA256T-I/ST

Memory IC Overview

The Microchip Technology 24AA256T-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 I²C compatible serial interface, supports page writes up to 64 bytes, and includes hardware write protection via the WP pin.

Memory IC Feature Summary

• Low-power CMOS technology with active current of 400 µA and standby current of 1 µA maximum
• Two-wire serial interface compatible with I²C protocol
• Hardware write-protect capability via the WP pin
• Schmitt trigger inputs for noise suppression

Memory IC Applications

• Personal communications devices
• Data acquisition systems
• Industrial control applications requiring non-volatile storage

Memory IC Procurement Notes

Verify that the ordering suffix 'I' corresponds to the Industrial temperature range (-40°C to +85°C) and 'ST' indicates the TSSOP-8 package. Confirm the specific revision level matches the datasheet DS20001203Y. Ensure the application environment stays within the specified 1.7V to 5.5V supply voltage limits.

Memory IC Selection Notes

Select this component when a 256-Kbit EEPROM with low power consumption and I²C compatibility is required. It is suitable for designs needing hardware write protection and operation down to 1.7V. Consider the TSSOP-8 package constraints and ensure the bus capacitance meets the timing specifications for the desired clock speed.

Memory IC Part Context

This part belongs to the 24AA256 family, which shares architecture with the 24LC256 and 24FC256 series. The primary distinction lies in the minimum operating voltage and maximum clock frequency. The 24AA256 supports operation down to 1.7V, whereas the 24LC256 requires a minimum of 2.5V.

Memory IC Replacement Considerations

The 24LC256T-I/ST is a functional substitute but requires a minimum supply voltage of 2.5V instead of 1.7V. The 24FC256T-I/ST offers higher speed capabilities up to 1 MHz but maintains the 1.7V minimum voltage requirement.