25LC256-I/P

Overview

The Microchip Technology 25LC256-I/P is a 256 Kbit (32,768 x 8-bit) Serial Electrically Erasable PROM accessed via an SPI-compatible bus. It operates within a supply voltage range of 2.5V to 5.5V and supports clock frequencies up to 10 MHz. The device features a 64-byte page size, self-timed erase/write cycles with a maximum duration of 5 ms, and industrial temperature support from -40°C to +85°C. It is housed in an 8-lead PDIP package.

Feature Summary

• Supports block write protection for none, one-quarter, one-half, or all memory array segments
• Includes built-in power-on/off data protection circuitry and a write enable latch
• Features a hold pin to pause serial communication without resetting the sequence
• Provides hardware write protection capability through the WP pin

Applications

• Microcontroller system data storage
• Configuration parameter retention
• Calibration value storage
• Device identification information logging

Procurement Notes

Verify that the ordering suffix 'I' corresponds to the Industrial temperature range (-40°C to +85°C). Confirm the 'P' suffix indicates the 8-lead Plastic Dual In-Line Package. Ensure the specific variant matches the required voltage range of 2.5V to 5.5V. Cross-reference the datasheet revision DS20001822H for accurate electrical specifications.

Selection Notes

Select this component when SPI interface compatibility is required alongside non-volatile data retention. Consider the 64-byte page write limit and the necessity of managing page boundary crossings in software. Evaluate the 1 million cycle endurance against application write frequency requirements. Verify that the 10 MHz maximum clock speed meets system timing constraints.

Part Context

This part belongs to the 25XX256 family of 256 Kbit Serial EEPROMs manufactured by Microchip Technology. It shares functional similarities with the 25AA256 but differs in minimum operating voltage. The family utilizes a standard SPI protocol for communication and includes advanced write protection features common across the series.

Replacement Considerations

The 25LC256-I/SN serves as a surface-mount alternative within the same product family. Both variants share identical electrical characteristics and functionality, differing only in the physical package type.