25LC040AT-I/MC

Overview

The Microchip Technology 25LC040AT-I/MC is a 4 Kbit Serial Electrically Erasable Programmable Read-Only Memory (EEPROM) utilizing a SPI-compatible serial bus. It features a 512 x 8-bit organization with a maximum clock frequency of 10 MHz and operates within a supply voltage range of 2.5V to 5.5V. The device supports industrial temperature ranges from -40°C to +85°C and is housed in an 8-lead 2x3 DFN package.

Feature Summary

• Supports sequential read operations and page write modes up to 16 bytes.
• Includes built-in write protection mechanisms such as power-on/off data protection, a write enable latch, and a dedicated write-protect pin.
• Features block write protection allowing selective array protection for none, one-quarter, one-half, or all segments.

Applications

• Microcontroller system configuration storage
• Data logging applications requiring non-volatile memory retention
• Parameter storage in industrial control systems

Procurement Notes

Verify the specific suffix 'MC' corresponds to the 8-lead 2x3 DFN package type when sourcing. Confirm the 'I' designation matches the required industrial temperature range of -40°C to +85°C for your application environment. Ensure the voltage supply aligns with the 2.5V minimum requirement specified for the LC series.

Selection Notes

Select this component for designs requiring low-power CMOS technology with high reliability and long data retention. It is suitable for applications needing hardware write protection and self-timed erase/write cycles. Consider the DFN package dimensions if space-constrained surface mount layouts are necessary.

Part Context

This part belongs to the 25AA040A/25LC040A family of 4K SPI Bus Serial EEPROMs. The LC variant specifically supports a wider voltage range starting at 2.5V compared to the AA series. It shares functional similarities with other Microchip EEPROMs but is distinct in its specific package and voltage characteristics.

Replacement Considerations

Direct replacements include other 25LC040A variants with different packages such as 25LC040AT-I/SN or 25LC040AT-I/MS, provided the interface and electrical specifications remain compatible.

FAQ

How does the HOLD pin function during serial communication?

The HOLD pin allows the user to pause transmission to the device without resetting the serial sequence. Transitions on input pins are ignored while held low, and communication resumes when the pin 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 writing to the next page.