24LC64-I/SM

Memory IC Overview

The Microchip Technology 24LC64-I/SM is a 64-Kbit Electrically Erasable PROM organized as an 8K x 8-bit memory block. It features a two-wire I2C compatible serial interface and operates on a single supply voltage ranging from 2.5V to 5.5V. The device supports clock frequencies up to 400 kHz within this voltage range, with a maximum access time of 900 ns. It utilizes low-power CMOS technology, drawing a maximum standby current of 1 µA and active current of 3 mA. The component includes hardware write protection, Schmitt trigger inputs for noise suppression, and output slope control to eliminate ground bounce.

Memory IC Feature Summary

• Supports cascading up to eight devices on the same bus using three functional address pins (A0, A1, A2) to expand address space.
• Includes a 32-byte page write buffer that allows efficient data transfer by storing multiple bytes before initiating an internal self-timed write cycle.
• Features hardware write protection via the WP pin, which inhibits all write operations when tied to VCC while leaving read operations unaffected.

Memory IC Applications

• Industrial systems requiring non-volatile data storage
• Power management circuits needing configuration retention
• Communication and network equipment

Memory IC Procurement Notes

Verify the specific suffix 'I/SM' corresponds to the Industrial temperature range (-40°C to +85°C) and the SOIJ-8 package type. Confirm that the operating voltage requirements align with the 2.5V minimum specification for the 24LC64 series, distinct from the 1.7V capability of the 24AA64 or 24FC64 variants. Ensure the design accounts for the open-drain SDA line pull-up resistor requirements.

Memory IC Selection Notes

Select this component when a 64-Kbit EEPROM with I2C compatibility is required for industrial environments. It is suitable for applications needing hardware write protection and low power consumption. Consider the 24LC64 specifically over the 24AA64 or 24FC64 if the system voltage does not drop below 2.5V, as it offers optimized performance within that specific range.

Memory IC Part Context

This part belongs to the 24XX64 family of serial EEPROMs manufactured by Microchip Technology. The family includes the 24AA64, 24FC64, and 24LC64, which share similar architectural features but differ in voltage ranges and clock speeds. The 24LC64 variant is specifically designed for operation down to 2.5V, distinguishing it from the lower-voltage capable 24AA64 and high-speed 24FC64 models.

Memory IC Replacement Considerations

Direct replacements include other packages within the same 24LC64 family, such as 24LC64-I/SN (SOIC), 24LC64-I/P (PDIP), or 24LC64T-I/MS (MSOP). Cross-family substitutes like 24AA64 or 24FC64 require verification of voltage compatibility and clock speed limitations.