24LC65T-I/SM

Memory IC Overview

The Microchip Technology 24LC65T-I/SM is a 64Kbit (8K x 8) serial electrically erasable PROM featuring an I2C-compatible two-wire interface. It operates within a voltage range of 2.5V to 6.0V and supports clock frequencies up to 400 kHz in Fast Mode. The device includes a 64-byte input cache for efficient page writes, with a typical write cycle time of 2 ms per page. It offers high endurance, with 10 million cycles guaranteed for a specific relocatable block and 1 million cycles for the remainder of the array. Data retention exceeds 200 years.

Memory IC Feature Summary

• Features a relocatable 4K-bit ultra-high-endurance memory block configurable via software for frequently changing data.
• Includes a 64-byte input cache that enables fast burst write loads by buffering multiple pages before initiating internal array programming.
• Provides programmable security options allowing write protection of up to fifteen contiguous 4K-bit blocks to safeguard critical code or data.

Memory IC Applications

• Advanced low-power nonvolatile code and data storage applications
• Personal communications systems requiring flexible memory management
• Data acquisition systems needing reliable long-term data retention

Memory IC Procurement Notes

Verify the specific suffix 'I' confirms the Industrial temperature range (-40°C to +85°C) and 'SM' denotes the 8-pin SOIJ surface mount package. Confirm the 'T' indicates tape and reel packaging if required for automated assembly. Ensure the design accounts for the 2.5V minimum supply voltage, as this variant differs from lower-voltage counterparts like the 24AA65.

Memory IC Selection Notes

Select this component when a standard 2.5V to 6.0V operating range is required alongside industrial temperature stability. The 24LC65T-I/SM is distinct from the 24AA65 due to its higher minimum voltage threshold. Consider the built-in security and high-endurance features if the application demands robust data protection without external components.

Memory IC Part Context

This part belongs to the 24XX65 family of smart serial EEPROMs, which share architectural similarities but differ in voltage ranges and temperature grades. The 24LC65 specifically targets commercial and industrial environments with a 2.5V minimum supply, contrasting with the 1.8V capability of the 24AA65 and the 4.5V requirement of the 24C65.

Memory IC Replacement Considerations

Direct functional substitutes within the same voltage and package constraints include the 24LC65/P (PDIP) or 24LC65T-I/SN (SOIC). For lower voltage requirements, the 24AA65 series may be considered if the system voltage allows. Verify pin compatibility and ensure the replacement supports the required 400 kHz bus speed.

Memory IC FAQ

How does the 64-byte cache affect write performance?

The cache allows the master to load up to 64 bytes of data before generating a Stop condition. This enables burst writing at the maximum bus rate, significantly improving throughput compared to byte-by-byte writes, though each page written still requires the typical 2 ms internal cycle time.

Can the high-endurance block location be changed after security is enabled?

No. Once the security option is set with a length greater than zero, the high-endurance block location cannot be changed. If the high-endurance block coincides with a security block, the high-endurance setting takes precedence.