25LC128-I/SM

Overview

The Microchip Technology 25LC128-I/SM is a 128 Kbit (16,384 x 8-bit) Serial Electrically Erasable PROM accessed via an SPI-compatible serial bus. It operates within a voltage range of 2.5V to 5.5V and supports a maximum clock frequency of 10 MHz at 4.5V ≤ Vcc ≤ 5.5V. The device features self-timed erase and write cycles with a maximum duration of 5 ms. It utilizes low-power CMOS technology, drawing a maximum standby current of 5 µA. The component is housed in an 8-lead SOIJ package and is rated for industrial temperature operation from -40°C to +85°C.

Feature Summary

• Supports sequential read operations with automatic address pointer incrementation across the memory array.
• Includes hardware write protection capabilities controlled by the WP pin and STATUS register bits.
• Features a HOLD input to suspend serial communication without resetting the sequence.
• Provides high reliability with over 1,000,000 erase/write cycles and data retention exceeding 200 years.

Applications

• Data storage in microcontroller systems requiring non-volatile memory
• Industrial control applications operating within specified temperature ranges
• Systems utilizing SPI interfaces for serial data logging

Procurement Notes

Verify the specific suffix 'I/SM' corresponds to the Industrial temperature grade (-40°C to +85°C) and the 8-lead SOIJ package type. Confirm that the supply voltage requirements align with the 2.5V minimum threshold, as this differs from the 25AA128 variant. Ensure compatibility with the host system's SPI protocol timing constraints before integration.

Selection Notes

Select this component when a 128 Kbit capacity is required with SPI interface compatibility. Choose the 25LC128 series over the 25AA128 if the application voltage does not drop below 2.5V. Consider the SOIJ package for surface-mount assembly needs. Verify that the 10 MHz clock speed meets the system's data throughput requirements.

Part Context

The 25LC128 is part of the 25XX128 family of serial EEPROMs manufactured by Microchip Technology. This family includes variants like the 25AA128, which offers a wider voltage range starting at 1.8V. The 25LC128 specifically targets applications requiring a 2.5V minimum supply voltage while maintaining standard SPI compatibility and industrial temperature ratings.

Replacement Considerations

The 25AA128 serves as a functional substitute if the application requires support for voltages down to 1.8V. Other packages within the same electrical specification include PDIP, SOIC, DFN, and TSSOP variants. Ensure any replacement maintains the 128 Kbit capacity and SPI interface compatibility.