25AA020AT-I/MS

Memory IC Overview

The Microchip Technology 25AA020AT-I/MS is a 2 Kbit (256 x 8-bit) Serial Electrically Erasable Programmable Read-Only Memory (EEPROM). It operates within a supply voltage range of 1.8 V to 5.5 V and supports a maximum clock frequency of 10 MHz via an SPI-compatible serial bus. The device features low-power CMOS technology with a standby current of 5 µA at 5.5 V. It includes self-timed erase and write cycles with a maximum duration of 5 ms, a page write mode supporting up to 16 bytes, and block write protection capabilities.

Memory IC Feature Summary

• Supports sequential read operations and page write modes for efficient data handling
• Includes built-in hardware write protection via the WP pin and software-controlled block protection
• Features power-on/off data protection circuitry and a write enable latch mechanism

Memory IC Applications

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

Memory IC Procurement Notes

Verify the specific suffix 'T' indicates tape-and-reel packaging when ordering. Confirm the 'I' designation corresponds to the industrial temperature range of -40°C to +85°C. Ensure the 1.8 V minimum operating voltage requirement aligns with the target system's power rails, as this variant differs from the 2.5 V minimum 25LC020A series.

Memory IC Selection Notes

Select this component for applications requiring low-voltage operation down to 1.8 V. The MSOP-8 package is suitable for space-constrained designs. Consider the 16-byte page size limitation when designing write algorithms to prevent data wrap-around across page boundaries. Verify compatibility with the host microcontroller's SPI interface timing requirements.

Memory IC Part Context

This part belongs to the 25XX020A family of 2 Kbit SPI EEPROMs. The 'AA' prefix denotes the 1.8 V to 5.5 V operating voltage range, distinguishing it from the 'LC' variant which requires a minimum of 2.5 V. The 'I' suffix specifies the industrial temperature grade, while 'MS' identifies the 8-lead MSOP package type.

Memory IC Replacement Considerations

25LC020AT-I/MS

Memory IC FAQ

How does the HOLD pin function during serial communication?

The HOLD pin allows the user to pause serial communication without resetting the sequence. When pulled low while SCK is low, the SI, SCK, and SO pins enter a high-impedance state. Communication resumes when HOLD is brought high while SCK is low.

What happens if a page write crosses a physical page boundary?

If a page write operation attempts to cross a physical page boundary, the data wraps around to the beginning of the current page, overwriting existing data instead of proceeding to the next page. Application software must prevent such operations.