25C040-I/P

Memory IC Overview

The Microchip Technology 25C040-I/P is a 4 Kbit (512 x 8) serial Electrically Erasable PROM utilizing SPI-compatible communication. It operates within a voltage range of 4.5 V to 5.5 V with a maximum clock frequency of 3 MHz. The device supports industrial temperature ranges from -40 °C to +85 °C and features block write protection, self-timed erase/write cycles, and high reliability with over 1 million endurance cycles and data retention exceeding 200 years.

Memory IC Feature Summary

• Supports hardware write protection via the WP pin and software-controlled block protection for array segments.
• Includes built-in power-on/off data protection circuitry and a write enable latch to prevent inadvertent writes.
• Enables sequential reading with automatic address pointer incrementation across memory pages.

Memory IC Applications

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

Memory IC Procurement Notes

Verify the specific suffix 'I' confirms the industrial temperature rating (-40 °C to +85 °C) and 'P' indicates the 8-lead PDIP package. Confirm that the component matches the legacy 25XX040 series documentation rather than the newer A-series variants if strict adherence to the original datasheet specifications is required for the design.

Memory IC Selection Notes

Select this part when a 5.0 V supply is mandatory, as lower voltage variants like the 25LC040 require different operating ranges. Ensure the application utilizes an SPI interface compatible with Mode 0,0 or Mode 1,1. Consider the 8-pin PDIP form factor only if through-hole mounting is necessary for the mechanical assembly constraints.

Memory IC Part Context

This component belongs to the 25AA040/25LC040/25C040 family of 4 Kbit serial EEPROMs. It shares architectural similarities with other members but is distinguished by its specific 4.5 V to 5.5 V operating voltage requirement and higher 3 MHz clock speed compared to the 2 MHz limit of the 25LC040 variant.

Memory IC Replacement Considerations

Public confirmed substitute part numbers: None identified in source material.

Memory IC FAQ

How does the HOLD pin function during serial communication?

The HOLD pin suspends transmission without resetting the sequence. Transitions on SI, SCK, and SO are ignored while held low, allowing the host to service interrupts before resuming communication.

What happens to the write enable latch upon power-up?

The device powers on in standby mode with the write enable latch reset, requiring a WREN instruction to be issued before any write operations can be completed.