25LC040XT-I/ST

Overview

The Microchip Technology 25LC040XT-I/ST is a 4 Kbit (512 x 8-bit) serial Electrically Erasable PROM. It operates within a voltage range of 2.5V to 5.5V and supports a maximum clock frequency of 2 MHz. The device utilizes an SPI-compatible interface with SCK, SI, SO, CS, HOLD, and WP pins. It features a TSSOP-8 package and operates across an industrial temperature range of -40°C to +85°C.

Feature Summary

• Supports sequential read operations and page writes up to 16 bytes.
• Includes hardware write protection via the WP pin and software block protection.
• Features self-timed erase and write cycles with internal write enable latch.

Applications

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

Procurement Notes

Verify that the ordering suffix 'I' corresponds to the Industrial temperature range (-40°C to +85°C). Confirm the 'ST' suffix indicates the TSSOP-8 package and the 'XT' suffix denotes the tape and reel packaging format. Ensure compatibility with the 2.5V to 5.5V supply voltage requirements for your specific application design.

Selection Notes

Select this component when a 4 Kbit non-volatile memory solution is required with SPI interface compatibility. It is suitable for applications needing low standby current and robust data retention exceeding 200 years. Consider the TSSOP-8 package constraints and verify that the 2 MHz clock speed meets the system's communication timing requirements.

Part Context

This part belongs to the 25XX040 family, which includes variants like the 25AA040 and 25C040. The datasheet notes that this specific series is not recommended for new designs; the 25LC040A is suggested as a modern alternative. The 'X' in the model number indicates an alternate pinout configuration available only for the ST package type.

Replacement Considerations

The 25LC040A is the recommended successor for new designs. Other compatible parts within the same family include the 25LC040T-I/SN or 25LC040-I/P depending on the required package style.

FAQ

What does the 'X' in the model number indicate?

The 'X' indicates an alternate pinout configuration, which is available exclusively for the TSSOP (ST) package.

How is the write operation protected?

Write operations are protected by a Write Enable Latch that must be set before writing, and a hardware Write Protect (WP) pin that can disable all writes when held low.