25AA320AT-I/SN

Memory IC Overview

The Microchip Technology 25AA320AT-I/SN is a 32-Kbit Serial Electrically Erasable PROM featuring a 4096 x 8-bit organization and a 32-byte page size. It interfaces via an SPI-compatible serial bus with a maximum clock frequency of 10 MHz at VCC levels between 4.5V and 5.5V, reducing to 5 MHz at 2.5V–4.5V and 3 MHz at 1.8V–2.5V. The device operates within a supply voltage range of 1.8V to 5.5V and supports an industrial temperature range of -40°C to +85°C. It is housed in an 8-lead SOIC package.

Memory IC Feature Summary

• Supports high-speed serial communication with clock frequencies up to 10 MHz under optimal voltage conditions.
• Includes built-in hardware write protection mechanisms utilizing the WP pin and STATUS register bits for data security.
• Features a HOLD input that allows suspension of serial transmission without resetting the current sequence state.

Memory IC Applications

• Data logging systems requiring non-volatile storage
• Configuration parameter storage in embedded controllers
• Calibration data retention in industrial sensors

Memory IC Procurement Notes

Verify the specific suffix 'T' indicates tape-and-reel packaging when sourcing components. Confirm the 'I' designation matches the required industrial temperature range of -40°C to +85°C for your application environment. Ensure the voltage supply aligns with the 1.8V to 5.5V operational limits specified in the datasheet.

Memory IC Selection Notes

Select this component for designs requiring low-power CMOS technology with robust data retention exceeding 200 years. Consider the 32-byte page write capability for efficient data management. Verify compatibility with the host microcontroller's SPI interface timing requirements, particularly setup and hold times across the supported voltage ranges.

Memory IC Part Context

This part belongs to the 25AA320A family of 32-Kbit SPI EEPROMs manufactured by Microchip Technology. It shares functional similarities with the 25LC320A but differs in minimum operating voltage specifications. The device is designed for direct interfacing with popular microcontroller families, including PIC devices, supporting both byte and page write operations.

Memory IC Replacement Considerations

The 25LC320A is a comparable device within the same family, though it requires a higher minimum supply voltage of 2.5V compared to the 1.8V minimum of the 25AA320A series. Verify voltage headroom before substitution.

Memory IC FAQ

How does the HOLD pin function during serial communication?

The HOLD pin suspends transmission when pulled low while SCK is low, ignoring transitions on SI and SCK until held high again to resume communication.

What determines the maximum clock frequency for this device?

The maximum clock frequency depends on the supply voltage: 10 MHz for 4.5V ≤ VCC ≤ 5.5V, 5 MHz for 2.5V ≤ VCC < 4.5V, and 3 MHz for 1.8V ≤ VCC < 2.5V.