25AA320AX-I/ST

Memory IC Overview

The Microchip Technology 25AA320A-I/ST is a 32-Kbit (4096 x 8-bit) Serial Electrically Erasable PROM. It operates via an SPI-compatible serial bus with SCK, SI, SO, and CS signals. The device supports a maximum clock frequency of 10 MHz at 4.5V to 5.5V supply voltage. It features a 32-byte page size for write operations. The industrial temperature range (-40°C to +85°C) is supported by the 'I' suffix. The 'ST' suffix indicates an 8-lead TSSOP package. Supply voltage ranges from 1.8V to 5.5V.

Memory IC Feature Summary

• Supports sequential read operations with automatic address pointer incrementation across the memory array.
• Includes hardware write protection controlled by the WP pin and STATUS register bits for block-level security.
• Features a HOLD input to suspend serial communication without resetting the current sequence state.

Memory IC Applications

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

Memory IC Procurement Notes

Verify the specific ordering suffix matches the required package type and temperature grade. Confirm that the 'I' designation aligns with the intended operating environment limits. Ensure the 'ST' suffix corresponds to the 8-lead TSSOP form factor required for the PCB layout. Cross-reference the datasheet revision to confirm compatibility with existing design specifications.

Memory IC Selection Notes

Select this component when a low-pin-count EEPROM interface is required for simple SPI buses. Consider the 32-byte page write limitation which necessitates software management of page boundaries. Evaluate the standby current consumption against power budget constraints. Verify that the 1.8V minimum supply voltage meets the system's lowest operating rail requirements.

Memory IC Part Context

This part belongs to the 25XX320A family of 32-Kbit Serial EEPROMs manufactured by Microchip Technology. It shares functional characteristics with the 25LC320A variant, differing primarily in the minimum supply voltage specification. The device utilizes standard SPI protocols for communication, making it compatible with a wide range of host controllers.

Memory IC Replacement Considerations

The 25LC320A is a functionally similar device within the same family, though it requires a higher minimum supply voltage. Verify package compatibility and voltage level tolerances before substitution. No other direct cross-references are documented in the provided source material.