25AA320XT-I/ST

Memory IC Overview

The Microchip Technology 25AA320XT-I/ST is a 32 Kbit serial Electrically Erasable PROM featuring a 4096 x 8 bit organization. It operates on an SPI-compatible bus with a maximum clock frequency of 1 MHz and supports a supply voltage range of 1.8V to 5.5V. The device utilizes low-power CMOS technology, offering typical standby current of 500 nA and read current of 500 μA. It provides high reliability with 1 million E/W cycles endurance and data retention exceeding 200 years. The component is housed in an 8-pin TSSOP package and supports industrial temperature ranges from -40°C to +85°C.

Memory IC Feature Summary

• Supports block write protection allowing selection of none, 1/4, 1/2, or all array segments.
• Includes built-in power on/off data protection circuitry and a write enable latch.
• Features a hold pin to suspend transmission without resetting the serial sequence.

Memory IC Applications

• Data storage for microcontroller systems via SPI interface
• Configuration memory in embedded devices
• Parameter storage requiring hardware write protection

Memory IC Procurement Notes

Verify the specific suffix 'XT' against official documentation as it may indicate tape and reel packaging distinct from standard tube versions. Confirm that the 'I' designation aligns with the required industrial temperature range specifications for your application environment. Ensure compatibility with the 1 MHz maximum clock frequency constraint during system design validation.

Memory IC Selection Notes

Select this component when a 32 Kbit non-volatile memory solution is required with SPI connectivity. It is suitable for applications needing wide voltage operation between 1.8V and 5.5V. Consider the 8-pin TSSOP package for space-constrained surface mount designs. Verify that the 1 MHz speed requirement fits within the system timing constraints.

Memory IC Part Context

This part belongs to the 25XX320 family of serial EEPROMs manufactured by Microchip Technology. It shares architectural similarities with the 25LC320 and 25C320 variants, differing primarily in voltage ranges and clock speeds. The datasheet notes that this specific generation is not recommended for new designs, suggesting consideration of updated alternatives like the 25AA320A series for future projects.

Memory IC Replacement Considerations

Public confirmed substitute part numbers include 25AA320A-I/ST and 25LC320A-I/ST. These newer variants offer similar functionality but may have updated electrical characteristics or packaging options. Verify pinout compatibility and software instruction set adherence before implementing any cross-replacement in existing designs.