25LC040-I/SN

Overview

The Microchip Technology 25LC040-I/SN is a 4 Kbit (512 x 8-bit) serial Electrically Erasable PROM accessed via an SPI-compatible bus. It operates within a voltage range of 2.5V to 5.5V with a maximum clock frequency of 2 MHz. The device supports self-timed erase and write cycles, featuring block write protection and power-on data protection. It utilizes low-power CMOS technology and is housed in an 8-lead Plastic Small Outline package.

Feature Summary

• Supports sequential read operations and page writes up to 16 bytes
• Includes hardware write-protect pin and software-controlled block protection
• Features hold functionality to pause serial communication without resetting the sequence

Applications

• Microcontroller system configuration storage
• Data logging for industrial applications
• Parameter storage in embedded devices

Procurement Notes

Verify that the specific ordering suffix matches the required temperature grade and package type. Confirm the voltage range aligns with the target application's supply rails. Ensure the design accounts for the recommended replacement parts as this component is not recommended for new designs.

Selection Notes

Select this part when a 2.5V to 5.5V operating range is required. Compare against the 25AA040 for lower voltage support or the 25C040 for higher speed requirements. Consider the 25LC040A series as the designated successor for new designs.

Part Context

This component belongs to the 25XX040 family of 4Kbit SPI Serial EEPROMs from Microchip Technology. It shares architectural similarities with the 25AA040 and 25C040 variants, differing primarily in supply voltage specifications and maximum clock frequencies.

Replacement Considerations

Public documentation identifies the 25LC040A as the recommended replacement for new designs. Verify compatibility with existing circuit layouts and software drivers before transitioning to the updated variant.

FAQ

How does the HOLD pin function during serial communication?

The HOLD pin suspends transmission to the device while in the middle of a serial sequence. Transitions on SI, SCK, and SO are ignored until the HOLD pin is brought high again.

What is the purpose of the Write-Protect (WP) pin?

When the WP pin is held low, all writes to the array or STATUS register are disabled. When held high, all functions including nonvolatile writes operate normally.