25LC1024-I/P

Overview

The Microchip Technology 25LC1024-I/P is a 1-Mbit (128K 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 256-byte page size, 1M erase/write cycle endurance, and data retention exceeding 200 years. It is housed in an 8-pin PDIP 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 automatic self-timed erase cycles, eliminating the need for separate erase commands before writing.
• Includes sector write protection capabilities allowing configuration to protect none, one-quarter, one-half, or all of the memory array.
• Features built-in hardware protections including power-on/off data protection, a write enable latch, and a dedicated write-protect pin.

Applications

• Storing non-volatile configuration parameters in embedded systems
• Logging operational data and system events
• Saving calibration constants and device-specific settings

Procurement Notes

Verify that the ordering suffix matches the required specifications: 'I' indicates the Industrial temperature range (-40°C to +85°C), while 'E' denotes Extended range. Confirm the '/P' suffix corresponds to the 8-Lead PDIP package type. Ensure the specific revision aligns with current manufacturing standards.

Selection Notes

Select this component when high-speed SPI communication is required alongside substantial storage capacity. It is suitable for applications needing robust write protection mechanisms and long-term data retention. Consider the operating voltage constraints and thermal environment to ensure compatibility with the Industrial grade rating.

Part Context

This part belongs to the 25LC1024 series of 1-Mbit SPI Bus Serial EEPROMs manufactured by Microchip Technology. The series offers various package options and temperature grades, providing flexibility for diverse embedded memory requirements while maintaining consistent electrical characteristics and instruction sets.

Replacement Considerations

Cross-reference with other 25LC1024 variants such as the 25LC1024-E/SM for extended temperature or surface mount needs. Verify pinout compatibility and voltage tolerances before substituting with similar SPI EEPROMs from other manufacturers.

FAQ

Is it necessary to perform an erase operation before writing new data?

No, the 25LC1024 performs an automatic, self-timed erase cycle internally during any write sequence, so explicit erase instructions are not required prior to writing.

How does the HOLD pin function during communication?

The HOLD pin allows the host to pause serial communication without resetting the sequence. Pulling HOLD low suspends data transfer on SI and SCK, tri-stating SO until HOLD is released.