25AA320AT-I/ST

Memory IC Overview

The Microchip Technology 25AA320AT-I/ST is a 32-Kbit Serial Electrically Erasable PROM featuring an SPI-compatible interface. It operates within a supply voltage range of 1.8V to 5.5V and supports clock frequencies up to 10 MHz at higher voltages. The device utilizes an 8-lead TSSOP package and functions across an industrial temperature range of -40°C to +85°C. Key electrical characteristics include a maximum write current of 5 mA, standby current of 5 µA, and data retention exceeding 200 years with over 1 million erase/write cycle endurance.

Memory IC Feature Summary

• Supports serial communication via a four-wire SPI bus with separate data input and output lines.
• Includes hardware write protection controlled by the WP pin and STATUS register bits.
• Features a HOLD pin to suspend transmission without resetting the serial sequence.

Memory IC Applications

• Data storage in microcontroller systems requiring non-volatile memory
• Configuration parameter storage for embedded devices
• Calibration data retention in industrial instrumentation

Memory IC Procurement Notes

Verify that the ordering suffix 'I' confirms the Industrial temperature grade (-40°C to +85°C) and 'ST' specifies the 8-lead TSSOP package. Confirm the 'T' indicates tape and reel packaging. Ensure compatibility with the required supply voltage range of 1.8V to 5.5V for your specific application design.

Memory IC Selection Notes

Select this component when a 32-Kbit capacity is required with SPI interface compatibility. The Industrial temperature rating suits general-purpose applications operating between -40°C and +85°C. Consider the 32-byte page size for write operations and ensure the system can accommodate the self-timed internal write cycle duration.

Memory IC Part Context

This part belongs to the 25AA320A series of 32-Kbit Serial EEPROMs from Microchip Technology. It shares functional similarities with the 25LC320A, though voltage ranges may differ. The series is designed for direct interfacing with popular microcontroller families supporting standard SPI protocols.

Memory IC Replacement Considerations

Public confirmed substitute part numbers: 25AA320A-I/ST, 25LC320A-I/ST.

Memory IC FAQ

How does the HOLD pin function during serial communication?

The HOLD pin suspends transmission to the device while in the middle of a serial sequence without resetting the sequence. Transitions on SI and SCK are ignored while held low, allowing the host to service higher priority interrupts.

What is the mechanism for write protection in this device?

Write protection is managed through the WP pin and the WPEN bit in the STATUS register. Hardware write protection is enabled when the WP pin is low and the WPEN bit is high, disabling writes to the nonvolatile array bits.