25AA1024-I/SM

Memory IC Overview

The Microchip Technology 25AA1024-I/SM is a 1-Mbit (131,072-byte) serial EEPROM utilizing an SPI-compatible interface. It operates within a supply voltage range of 1.8V to 5.5V and supports clock frequencies up to 20 MHz at higher voltages. The device features a 256-byte page size with self-timed write cycles of 6 ms maximum. It includes sector-level write protection for 32K-byte sectors and offers high reliability with 1 million erase/write cycles endurance and over 200 years data retention. The industrial temperature grade (-40°C to +85°C) variant is housed in an 8-lead SOIJ package.

Memory IC Feature Summary

• Supports byte and page-level write operations without requiring prior page or sector erase cycles.
• Includes hardware write protection via the WP pin and software protection through the STATUS register block protect bits.
• Features a HOLD input to pause serial communication without resetting the sequence, allowing host interrupt servicing.
• Provides deep power-down mode for minimal standby current consumption.

Memory IC Applications

• Data logging in industrial control systems
• Configuration storage for microcontroller-based embedded devices
• Calibration data retention in automotive electronics

Memory IC Procurement Notes

Verify that the ordering suffix matches the required package type and temperature range. Confirm the specific revision level against the manufacturer datasheet DS20001836K. Ensure compatibility with system voltage levels and SPI timing requirements before integration. Check for RoHS compliance status if required by project specifications.

Memory IC Selection Notes

Select this component when a non-volatile memory solution requires sector-level erasure capabilities typically found in Flash, but with EEPROM endurance characteristics. It is suitable for applications needing flexible write protection schemes and low-power operation across a wide voltage range. Consider the 25LC1024 if a lower minimum operating voltage is not required and cost optimization is prioritized.

Memory IC Part Context

This part belongs to the 25XX1024 family of 1-Mbit serial EEPROMs from Microchip Technology. The 'I' suffix denotes the Industrial temperature range (-40°C to +85°C), while 'SM' indicates the 8-lead Small Outline Integrated Circuit (SOIJ) package. This family shares functional similarities with the 25LC1024 but differs in minimum operating voltage specifications.

Memory IC Replacement Considerations

The 25LC1024 is a functionally similar alternative within the same family, though it may have different voltage thresholds. Verify pinout compatibility and ensure the replacement meets the specific voltage and temperature requirements of the design.

Memory IC FAQ

Does the 25AA1024 require an erase cycle before writing new data?

No, the device supports byte and page writes without requiring prior page or sector erase cycles.

How is the HOLD function utilized during serial communication?

Pulling the HOLD pin low pauses serial communication without resetting the sequence, allowing the host to service interrupts. Communication resumes when HOLD is pulled high while SCK is low.