25LC512T-I/SN

Overview

The Microchip Technology 25LC512T-I/SN is a 512 Kbit (64K x 8) serial EEPROM utilizing an SPI-compatible interface. It operates within a voltage range of 2.5V to 5.5V and supports clock frequencies up to 20 MHz at higher voltages or 10 MHz at lower voltages. The device features a 128-byte page size, 1 million erase/write cycle endurance, and data retention exceeding 200 years. It is housed in an 8-lead SOIC package and functions reliably across an industrial temperature range of -40°C to +85°C.

Feature Summary

• Supports byte-level and page-level write operations with self-timed internal cycles, eliminating the need for separate sector or page erase commands prior to writing.
• Includes hardware write protection via the WP pin and software block protection through the STATUS register, allowing selective array protection.
• Features a HOLD input that suspends serial communication without resetting the sequence, enabling host interruption handling.
• Provides deep power-down mode for minimal current consumption and includes built-in power-on/off data protection circuitry.

Applications

• Data logging and storage in industrial control systems
• Configuration parameter storage in embedded microcontroller applications
• Calibration data retention in automotive electronic modules

Procurement Notes

Verify the specific suffix 'I' confirms the Industrial temperature range (-40°C to +85°C) and 'SN' denotes the 8-lead SOIC package. Confirm RoHS compliance status matches project requirements. Ensure the ordering quantity aligns with the manufacturer's standard shipping configurations for tape and reel formats.

Selection Notes

Select this component when a non-volatile memory solution requires high endurance and long-term data retention. It is suitable for designs needing simple SPI connectivity with flexible write protection options. Consider the 128-byte page size for efficient bulk data writes and verify the operating voltage range matches the system supply rails.

Part Context

This part belongs to the 25LC512 family of serial EEPROMs from Microchip Technology. It shares architectural similarities with other devices in the series but is distinguished by its 512 Kbit capacity and specific package designation. The 'T' indicates tape and reel packaging, while 'I' specifies the industrial temperature grade.

Replacement Considerations

Direct replacements include other 25LC512 variants such as 25LC512-E/SN for extended temperature ranges or 25LC512-I/P for PDIP packages. Cross-referencing with similar SPI EEPROMs requires verifying voltage compatibility and pinout alignment.

FAQ

How does the HOLD pin function during serial communication?

The HOLD pin allows the host to pause serial communication mid-sequence. When pulled low while SCK is low, the device ignores SI and SCK transitions until HOLD is released, preserving the address pointer state.

What is the difference between Page Erase and Sector Erase?

Page Erase clears all bits within a single 128-byte page, while Sector Erase clears one of four 16KB sectors. Both require a preceding Write Enable command and are self-timed.