24AA64/SN

Memory IC Overview

The Microchip Technology 24AA64/SN 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 with a maximum clock frequency of 400 kHz for VCC ≥ 2.5V and 100 kHz for VCC < 2.5V. The device operates on a single supply voltage ranging from 1.7V to 5.5V, with a maximum active current of 3 mA and standby current of 1 µA. It utilizes low-power CMOS technology and includes a 32-byte page write buffer. The component is housed in an 8-lead SOIC package.

Memory IC Feature Summary

• Supports cascading up to eight devices on the same bus using three hardware address pins.
• Includes Schmitt trigger inputs for enhanced noise suppression and output slope control to eliminate ground bounce.
• Features hardware write protection via the WP pin to inhibit array writes while maintaining read access.
• Provides self-timed erase/write cycles with acknowledge polling capability to maximize bus throughput.

Memory IC Applications

• Industrial systems requiring non-volatile data storage
• Automotive electronics utilizing AEC-Q100 qualified components
• Embedded controllers needing compact serial EEPROM solutions

Memory IC Procurement Notes

Verify that the specific ordering suffix matches the required temperature grade (Industrial or Extended) and package type. Confirm RoHS compliance status and ensure the selected variant supports the intended operating voltage range. Check for any recent Product Change Notifications regarding packaging or assembly site updates before finalizing procurement.

Memory IC Selection Notes

Select this component when a 64-Kbit capacity with I2C compatibility is required within a standard 8-lead SOIC footprint. Ensure the system design accommodates the 1.7V minimum supply voltage and provides appropriate pull-up resistors for the SDA and SCL lines. Consider the 32-byte page write buffer size when designing write algorithms to optimize performance.

Memory IC Part Context

This part belongs to the 24XX64 family, which also includes the 24FC64 and 24LC64 variants. While sharing the same memory architecture and interface, these variants differ in maximum clock frequency and minimum operating voltage specifications. The 24AA64 specifically supports operation down to 1.7V with a 400 kHz clock limit at higher voltages.

Memory IC Replacement Considerations

Direct functional substitutes within the same package include the 24LC64-I/SN and 24FC64-I/SN. Note that the 24LC64 requires a minimum supply voltage of 2.5V, whereas the 24AA64 supports 1.7V. The 24FC64 offers a higher 1 MHz clock speed but shares the 1.7V minimum voltage specification.

Memory IC FAQ

How does the Write Protect (WP) pin function?

When tied to VCC, the WP pin inhibits all write operations to the array while allowing read operations to proceed normally. When tied to VSS, write protection is disabled, permitting both read and write access.

What is the behavior during a page write across a boundary?

If a page write command attempts to cross a physical page boundary, the data wraps around to the beginning of the current page instead of writing to the next page. Application software must prevent such operations to avoid data overwriting.