25AA128X-I/ST

Memory IC Overview

The Microchip Technology 25AA128X-I/ST is a 128 Kbit (16,384 x 8-bit) Serial Electrically Erasable PROM accessed via an SPI-compatible serial bus. It operates within a supply voltage range of 1.8V to 5.5V and supports a maximum clock frequency of 10 MHz at higher voltages. The device features self-timed erase and write cycles with a maximum duration of 5 ms. It includes hardware write protection capabilities and is housed in an 8-lead TSSOP package.

Memory IC Feature Summary

• Supports high-speed SPI communication with a maximum clock frequency of 10 MHz
• Includes built-in write protection mechanisms such as power-on/off data protection and a dedicated write-protect pin
• Features block write protection allowing selective protection of none, one-quarter, one-half, or the entire memory array
• Provides hold functionality to pause serial transmission without resetting the sequence

Memory IC Applications

• Data storage for configuration parameters in microcontroller systems
• Logging operational data in industrial control applications
• Storing calibration constants and user settings in embedded devices

Memory IC Procurement Notes

Verify that the specific ordering suffix matches the required temperature grade and package type. Confirm the voltage range requirements align with the 1.8V to 5.5V specification. Ensure compatibility with the SPI interface protocol used by the host system. Check for any specific RoHS compliance documentation if required by the manufacturing process.

Memory IC Selection Notes

Select this component when a low-pin-count non-volatile memory solution is needed for small data sets. It is suitable for designs requiring hardware write protection and sequential read access. Consider the 1.8V minimum operating voltage for low-power applications. Verify that the 64-byte page size fits the application's write granularity requirements.

Memory IC Part Context

This part belongs to the 25XX128 family of SPI Serial EEPROMs from Microchip Technology. It shares functional similarities with the 25LC128 but differs in its lower minimum operating voltage of 1.8V compared to the 2.5V minimum of the LC variant. Both devices utilize the same 8-pin packages and instruction set.

Memory IC Replacement Considerations

The 25LC128-I/ST is a functionally similar alternative within the same datasheet, though it requires a minimum supply voltage of 2.5V instead of 1.8V.