24LC64F-I/ST

Memory IC Overview

The Microchip Technology 24LC64F-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, supporting clock frequencies up to 400 kHz at supply voltages between 2.5V and 5.5V. The device utilizes low-power CMOS technology, drawing a maximum standby current of 1 µA and read current of 400 µA. It includes a 32-byte page write buffer and hardware write protection for the upper quarter of the array (addresses 1800h-1FFFh). The component operates within an industrial temperature range of -40°C to +85°C and is housed in an 8-lead TSSOP package.

Memory IC Feature Summary

• Supports bidirectional data transfer via a Two-Wire serial interface compatible with standard I2C bus protocols.
• Includes hardware write protection capability that inhibits write operations to the upper quarter of the memory array when the WP pin is tied high.
• Features Schmitt trigger inputs on SDA and SCL pins to suppress noise spikes and output slope control to eliminate ground bounce.
• Provides self-timed erase/write cycles with a maximum page write time of 5 ms.

Memory IC Applications

• Personal communications devices requiring non-volatile storage
• Data acquisition systems needing parameter retention
• Industrial applications utilizing I2C communication buses

Memory IC Procurement Notes

Verify the specific suffix 'I' corresponds to the Industrial temperature range (-40°C to +85°C) and 'ST' denotes the 8-lead TSSOP package. Confirm the voltage operating range matches system requirements, as this variant supports 2.5V to 5.5V. Ensure compatibility with the host controller's I2C clock speed limits before integration.

Memory IC Selection Notes

Select this component for designs requiring low standby power and byte-level random access without sector erasure constraints. It is suitable for applications needing hardware write protection for critical configuration data. Consider the 400 kHz maximum clock frequency when designing for high-speed bus environments compared to faster FC variants.

Memory IC Part Context

This part belongs to the 24XX64F family of 64-Kbit serial EEPROMs from Microchip Technology. It shares architectural similarities with the 24AA64F and 24FC64F models but differs in minimum operating voltage and maximum clock frequency specifications. The family supports cascading up to eight devices on a single bus using three address pins.

Memory IC Replacement Considerations

Public confirmed substitute part numbers: 24AA64F-I/ST, 24FC64F-I/ST.

Memory IC FAQ

How does the Write Protect (WP) pin function?

When the WP pin is tied to VCC, write operations are inhibited for the upper 1/4 of the array (addresses 1800h-1FFFh), while read operations remain unaffected. Tying it to VSS disables write protection for the entire array.

What is the maximum page write size?

The device contains a 32-byte page write buffer. Writing more than 32 bytes in a single sequence causes the address counter to roll over, overwriting data from the beginning of the current page.