24AA65/SM

Memory IC Overview

The Microchip Technology 24AA65/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 1.8V 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 programmable security options and a high-endurance block, housed in an 8-pin SOIJ package.

Memory IC Feature Summary

• Features a relocatable 4K bit ultra-high-endurance memory block rated for 10 million erase/write cycles, while the remaining array supports 1 million cycles.
• Includes a 64-byte input cache that allows fast sequential write loads by buffering up to eight pages before initiating internal write cycles.
• Provides programmable security options to protect critical data or code by locking out write access to specific contiguous memory blocks.
• Incorporates Schmitt trigger inputs on SCL and SDA lines to suppress noise spikes and ensure reliable operation on noisy buses.

Memory IC Applications

• Advanced low-power personal communications devices requiring nonvolatile data storage
• Data acquisition systems needing frequent updates to specific memory regions
• Embedded systems utilizing I2C bus architecture for compact serial EEPROM integration

Memory IC Procurement Notes

Verify the specific suffix 'SM' corresponds to the 8-pin surface mount SOIJ package variant. Confirm the operating temperature range matches your application requirements, as commercial grades are limited to 0°C to +70°C. Ensure the voltage supply aligns with the 1.8V minimum specification for the 24AA series. Check RoHS compliance status if required by your manufacturing standards.

Memory IC Selection Notes

Select this component when a smart EEPROM with flexible memory endurance distribution is required. The 24AA65/SM is suitable for designs needing a wide voltage range starting from 1.8V. Consider the 64-byte cache feature if burst write performance is critical. Compare against 24LC65 variants if a higher minimum voltage of 2.5V is acceptable for potentially lower costs or different availability.

Memory IC Part Context

This part belongs to the 24XX65 family of smart serial EEPROMs, which also includes the 24LC65 and 24C65. These devices share identical pinouts and functional architectures but differ in voltage ranges and temperature specifications. The 24AA65 specifically supports operation down to 1.8V, distinguishing it from the 24LC65 which requires a minimum of 2.5V.

Memory IC Replacement Considerations

The 24LC65/SM is a direct functional substitute with identical pinout and features, provided the system voltage does not drop below 2.5V. Other 24XX65 variants like 24C65/SM offer similar functionality but require higher voltages. Verify package compatibility and temperature ratings when substituting.

Memory IC FAQ

How does the high-endurance block function?

The high-endurance block is a relocatable 4K bit section of memory that can be programmed to withstand 10 million erase/write cycles. Its location is set via configuration commands, and it takes precedence over security settings if they overlap.

What happens if a write operation targets a protected security block?

If a write command attempts to access a protected address, no data is written to that location. The device does not report an error or abort the command; it simply ignores the write attempt for the secure portion.

Can multiple 24AA65/SM devices be used on the same bus?

Yes, up to eight devices can be connected to the same I2C bus. This is achieved by configuring the A0, A1, and A2 address pins to unique combinations, allowing for a contiguous address space of up to 512K bits.