25AA320AXT-I/ST

Memory IC Overview

The Microchip Technology 25AA320AXT-I/ST is a 32-Kbit Serial Electrically Erasable PROM featuring a 4096 x 8-bit organization. It operates via an SPI-compatible serial bus with a maximum clock frequency of 10 MHz at VCC voltages between 4.5V and 5.5V, scaling to 5 MHz at 2.5V–4.5V and 3 MHz at 1.8V–2.5V. The device supports a supply voltage range of 1.8V to 5.5V and includes a 32-byte page size for write operations. It offers high reliability with over 1 million erase/write cycles and data retention exceeding 200 years. The component is housed in an 8-lead TSSOP package and functions within an industrial temperature range of -40°C to +85°C.

Memory IC Feature Summary

• Supports hardware write protection through the WP pin and STATUS register bits for array security
• Includes built-in power-on/off data protection circuitry and a write enable latch mechanism
• Features a HOLD input pin to suspend serial communication without resetting the sequence

Memory IC Applications

• Microcontroller system data storage
• Configuration parameter retention
• Calibration value archiving

Memory IC Procurement Notes

Verify that the ordering suffix 'XT' corresponds to the specific tape-and-reel packaging configuration required for automated assembly processes. Confirm the 'I' designation aligns with the specified industrial temperature operating range. Ensure the voltage specifications match the target system's power supply rails before finalizing procurement orders.

Memory IC Selection Notes

Select this component when a low-pin-count nonvolatile memory solution is required for systems utilizing standard SPI interfaces. The wide voltage compatibility allows integration into both 1.8V and 5V logic environments. Consider the page write architecture for applications requiring efficient bulk data updates within single page boundaries.

Memory IC Part Context

This part belongs to the 25XX320A family, which also includes the 25LC320A variant. The primary distinction lies in the minimum operating voltage; the 25AA320A supports 1.8V operation, whereas the 25LC320A requires a minimum of 2.5V. Both share identical pinouts, instruction sets, and functional characteristics.

Memory IC Replacement Considerations

The 25LC320A serves as a functional substitute if the application voltage remains above 2.5V. Verify that any replacement maintains the same TSSOP-8 package dimensions and pin assignments to ensure mechanical compatibility.