25LC020A-E/MS

Overview

The Microchip Technology 25LC020A-E/MS is a 2 Kbit (256 x 8-bit) Serial Electrically Erasable Programmable Read-Only Memory (EEPROM). It features an SPI-compatible serial bus interface with a maximum clock frequency of 10 MHz. The device operates within a supply voltage range of 2.5 V to 5.5 V and supports page write modes of up to 16 bytes. It includes self-timed erase and write cycles with a maximum duration of 5 ms. The component is housed in an 8-lead MSOP package and is designed for extended industrial temperature ranges.

Feature Summary

• Supports sequential read operations and page write modes with automatic address pointer incrementation.
• Includes hardware write protection via the WP pin and software-based block protection through the STATUS register.
• Features power-on/off data protection circuitry and a write enable latch to prevent inadvertent writes.
• Allows communication suspension via the HOLD pin without resetting the current serial sequence.

Applications

• Storage of device unique identification numbers and production batch codes
• Retention of calibration parameters and user configuration settings
• Logging of operational status or fault records in embedded systems

Procurement Notes

Verify that the specific suffix 'E' corresponds to the automotive temperature grade (-40°C to +125°C) rather than the standard industrial grade. Confirm the 'MS' designation indicates the 8-lead MSOP package type. Ensure compatibility with the required SPI clock speed and voltage levels before integration into the final design.

Selection Notes

Select this part when an application requires non-volatile storage for small amounts of critical data such as configuration or IDs. The 25LC020A-E variant is suitable for environments requiring operation at higher temperatures compared to standard industrial components. Consider the 16-byte page write capability for efficient data updates.

Part Context

This component belongs to the 25XX020A family of 2 Kbit SPI EEPROMs manufactured by Microchip Technology. The 'LC' prefix denotes a minimum operating voltage of 2.5 V, distinguishing it from the 'AA' series which supports lower voltages down to 1.8 V. The 'E' suffix specifies the extended temperature range classification.

Replacement Considerations

The 25LC020A-I/MS serves as a direct functional substitute if the extended temperature range is not required. Other members of the 25LC020A family share identical pinouts and instruction sets but may differ in voltage specifications or packaging options.

FAQ

How does the HOLD pin function during SPI communication?

The HOLD pin allows the host to pause serial communication without resetting the sequence. When pulled low while SCK is low, inputs are ignored and SO goes high-impedance. 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 attempts to cross a 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 this occurrence.