25AA256X-I/ST

Memory IC Overview

The Microchip Technology 25AA256X-I/ST is a 256 Kbit Serial Electrically Erasable PROM featuring a 32,768 x 8-bit organization. It utilizes an SPI-compatible serial bus with a maximum clock frequency of 10 MHz. The device operates within a supply voltage range of 1.8 V to 5.5 V and supports industrial temperature ranges from -40°C to +85°C. It is housed in an 8-lead TSSOP package.

Memory IC Feature Summary

• Supports self-timed erase and write cycles with a maximum duration of 5 ms.
• Includes built-in power-on/off data protection circuitry and a write enable latch.
• Features programmable block write protection for none, 1/4, 1/2, or all of the array.
• Provides high reliability with over 1,000,000 erase/write cycles and greater than 200 years of data retention.

Memory IC Applications

• Microcontroller system data storage
• Configuration parameter storage
• Calibration data retention

Memory IC Procurement Notes

Verify that the ordering suffix matches the required specifications. Confirm the 'I' designation corresponds to the Industrial temperature range (-40°C to +85°C). Ensure the '/ST' suffix indicates the 8-lead TSSOP package type. Cross-reference the specific part number against the manufacturer's current datasheet to confirm active status and electrical characteristics.

Memory IC Selection Notes

Select this component when a low-pin-count non-volatile memory solution is required for SPI-based systems. The 1.8 V minimum operating voltage makes it suitable for applications requiring lower supply voltages compared to standard 5 V only devices. The 64-byte page size allows for efficient sequential data writes within physical page boundaries.

Memory IC Part Context

This component belongs to the 25XX256 family of Serial EEPROMs manufactured by Microchip Technology. It shares functional similarities with the 25LC256 but differs in its supported voltage range. The family is designed for direct interface with popular microcontroller families, including PIC microcontrollers, via a simple three-wire serial interface.

Memory IC Replacement Considerations

The 25LC256 is a related device within the same family. Verify if the application requires the extended voltage range or specific pinout compatibility before substitution. Check for any changes in packaging or temperature ratings that may affect system integration.