25AA320A-I/SN

Memory IC Overview

The Microchip Technology 25AA320A-I/SN is a 32-Kbit Serial Electrically Erasable PROM featuring an SPI-compatible interface. It operates within a 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 SOIC 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 cycles.

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 self-timed internal write cycles that automatically reset the write enable latch upon completion.
• Provides sequential read capabilities with automatic address pointer incrementation.

Memory IC Applications

• Data storage for configuration parameters in microcontroller systems
• Logging operational history or event records in embedded devices
• Storing calibration constants and user settings in industrial equipment

Memory IC Procurement Notes

Verify the specific suffix 'I/SN' confirms the Industrial temperature grade (-40°C to +85°C) and the 8-lead SOIC narrow body package. Ensure the ordering part number matches the required voltage range of 1.8V to 5.5V. Confirm compliance with RoHS standards as specified in the manufacturer documentation.

Memory IC Selection Notes

Select this component when a non-volatile memory solution requires low power consumption and simple serial interfacing. The 32-Kbit capacity is suitable for small data sets. Consider the 10 MHz clock speed for high-throughput applications, noting that frequency limits decrease at lower supply voltages below 4.5V.

Memory IC Part Context

This device belongs to the 25AA320A/25LC320A family of 32-Kbit Serial EEPROMs. The 'AA' designation indicates support for a 1.8V minimum supply voltage, distinguishing it from the 'LC' variant which requires a minimum of 2.5V. Both variants share identical functional specifications and pinouts.

Memory IC Replacement Considerations

The 25LC320A-I/SN is a compatible alternative within the same family, though it requires a minimum supply voltage of 2.5V instead of 1.8V. Other packages in the 25AA320A series, such as MSOP or PDIP, offer equivalent functionality with different physical footprints.

Memory IC FAQ

How does the HOLD pin function during serial communication?

The HOLD pin allows the host to pause transmission mid-sequence without resetting the serial sequence. When pulled low while SCK is low, the device ignores SI and SCK transitions until HOLD is released.

What happens to the write enable latch after a write operation?

The write enable latch is automatically reset after any successfully executed WRITE instruction, WRSR instruction, or WRDI instruction, requiring a new WREN command for subsequent writes.