24AA64F-I/ST

Memory IC Overview

The Microchip Technology 24AA64F-I/ST is a 64-Kbit Electrically Erasable PROM organized as an 8K x 8-bit memory block. It features a Two-Wire Serial Interface compatible with I2C protocols. The device operates on a single supply voltage ranging from 1.7V to 5.5V, supporting clock frequencies up to 400 kHz for voltages at or above 2.5V, and 100 kHz for voltages between 1.7V and 2.5V. It includes a 32-byte page write buffer and hardware write-protect functionality for the upper quarter of the array (addresses 1800h-1FFFh). The component is housed in an 8-lead TSSOP package and is rated for industrial operating temperatures from -40°C to +85°C.

Memory IC Feature Summary

• Hardware write-protect capability for the upper quarter of the memory array via the WP pin
• Supports cascading up to eight devices on the same bus using three address pins
• Includes Schmitt trigger inputs for noise suppression and output slope control to eliminate ground bounce

Memory IC Applications

• Personal communications systems requiring low-power non-volatile storage
• Data acquisition applications needing reliable parameter retention
• Embedded systems utilizing I2C serial interfaces for configuration data

Memory IC Procurement Notes

Verify the specific suffix 'I/ST' corresponds to the Industrial temperature range (-40°C to +85°C) and the 8-lead TSSOP package type. Confirm that the required clock frequency aligns with the voltage conditions specified in the datasheet, as performance varies below 2.5V. Ensure compatibility with the host controller's I2C pull-up requirements and voltage levels before integration.

Memory IC Selection Notes

Select this component when a 64-Kbit EEPROM with quarter-array write protection is required. It is suitable for designs operating down to 1.7V, unlike the 24LC64F variant which requires a minimum of 2.5V. Choose this part over the 24FC64F if a maximum clock speed of 400 kHz is sufficient, as the FC version supports higher speeds but may have different electrical characteristics at lower voltages.

Memory IC Part Context

This device belongs to the 24XX64F family of 64-Kbit I2C Serial EEPROMs manufactured by Microchip Technology. The family includes variants such as the 24AA64F, 24LC64F, and 24FC64F, which share similar memory architectures but differ in minimum operating voltage and maximum clock frequency specifications. The 'I' designation indicates the industrial temperature grade, while '/ST' specifies the surface-mount TSSOP packaging.

Memory IC Replacement Considerations

Direct functional substitutes within the same package and specification include other 24AA64F variants with different packages, such as 24AA64F-I/SN (SOIC) or 24AA64F-I/MS (MSOP). Cross-family replacements like the 24LC64F-I/ST are possible only if the system voltage remains above 2.5V.