25AA320X-I/ST

Memory IC Overview

The Microchip Technology 25AA320X-I/ST is a 32 Kbit (4096 x 8 bit) serial Electrically Erasable PROM. It utilizes a Serial Peripheral Interface (SPI) compatible bus for communication, requiring SCK, SI, SO, and CS signals. The device supports a maximum clock frequency of 1 MHz and operates within a supply voltage range of 1.8 V to 5.5 V. It features self-timed erase and write cycles with a maximum cycle time of 5 ms. The component is housed in an 8-pin TSSOP package and is rated for industrial temperature ranges.

Memory IC Feature Summary

• Supports block write protection allowing selection of none, one-quarter, one-half, or all array segments.
• Includes built-in power on/off data protection circuitry and a write enable latch mechanism.
• Features a hold pin that suspends transmission during serial sequences without resetting the sequence.

Memory IC Applications

• Data storage for microcontroller systems via SPI interface
• Configuration memory for embedded devices
• Parameter storage in industrial control applications

Memory IC Procurement Notes

Verify the specific suffix 'X' against official documentation, as standard datasheets list variants such as 25AA320-I/ST. Confirm the exact electrical characteristics and package dimensions match project requirements. Ensure compatibility with the host system's SPI protocol and voltage levels before integration.

Memory IC Selection Notes

Select this component for applications requiring non-volatile storage accessible via standard SPI buses. Consider the 1.8 V to 5.5 V operating range for flexibility in low-power designs. Verify that the 1 MHz maximum clock speed meets the system's throughput requirements and that the TSSOP-8 package fits the PCB layout constraints.

Memory IC Part Context

This part belongs to the 25XX320 family of serial EEPROMs from Microchip Technology. The family includes variants like the 25LC320 and 25C320, which differ primarily in supply voltage ranges and maximum clock frequencies. The 25AA320 series is specifically designed for lower voltage operation starting at 1.8 V.

Memory IC Replacement Considerations

Datasheet notes recommend using the 25AA320A or 25LC320A instead of the 25AA320 for new designs. Verify if the 'A' variant offers improved specifications or updated packaging while maintaining pin compatibility.