25LC128-I/SN

Overview

The Microchip Technology 25LC128-I/SN is a 128 Kbit Serial Electrically Erasable PROM featuring a 16,384 x 8-bit organization. It interfaces via an SPI-compatible serial bus with a maximum clock frequency of 10 MHz at VCC levels between 4.5V and 5.5V. The device operates within a supply voltage range of 2.5V to 5.5V and supports industrial temperature conditions from -40°C to +85°C. Packaged in an 8-lead SOIC (3.90 mm wide), it includes self-timed erase/write cycles with a maximum duration of 5 ms.

Feature Summary

• Supports sequential read operations with automatic address pointer incrementation across the memory array.
• Includes hardware write protection controlled by the WP pin and STATUS register bits for data security.
• Features internal power-on/off data protection circuitry to prevent inadvertent writes during power transitions.
• Provides block write protection capabilities allowing selective protection of none, one, two, or all array segments.

Applications

• Data storage for configuration parameters in microcontroller systems
• Logging operational data in industrial monitoring devices
• Storing calibration constants in embedded sensor applications

Procurement Notes

Verify that the ordering suffix matches the required package type and temperature grade. Confirm the specific revision level against the manufacturer's latest datasheet to ensure compatibility with existing design specifications. Check for any product change notifications affecting pinout or electrical characteristics before finalizing procurement orders.

Selection Notes

Select this component when a 128 Kbit non-volatile memory solution is required with SPI interface compatibility. Ensure the system operating voltage falls within the 2.5V to 5.5V range. Consider the industrial temperature rating if the application environment exceeds standard commercial limits. Verify that the 8-lead SOIC package dimensions fit the available PCB footprint constraints.

Part Context

This part belongs to the 25XX128 family of serial EEPROMs manufactured by Microchip Technology. It shares functional similarities with the 25AA128 variant but differs in minimum operating voltage requirements. The family supports multiple package options including PDIP, SOIC, TSSOP, and DFN formats to accommodate various design integration needs.

Replacement Considerations

25LC128T-I/SN

FAQ

How does the HOLD pin function during serial communication?

The HOLD pin allows suspension of transmission mid-sequence without resetting the serial sequence. It must be held low while SCK is low to pause communication, tri-stating the SO line until brought high again.

What determines the write protection status of the memory array?

Write protection is determined by the combination of the WP pin state and the WPEN bit in the STATUS register. Hardware protection is active when WP is low and WPEN is high.