25LC320A-E/ST

Overview

The Microchip Technology 25LC320A-E/ST is a 32-Kbit Serial Electrically Erasable PROM featuring a 4096 x 8-bit organization. It operates within a supply voltage range of 2.5V to 5.5V and supports a maximum clock frequency of 10 MHz at voltages between 4.5V and 5.5V. The device utilizes an SPI-compatible interface with separate data in (SI) and data out (SO) lines, controlled by Chip Select (CS), Serial Clock (SCK), and Hold (HOLD) inputs. It is housed in an 8-Lead TSSOP package and is rated for extended temperature operation from -40°C to +125°C.

Feature Summary

• Supports high-speed serial communication via SPI bus with up to 10 MHz clock frequency
• Includes hardware write protection through dedicated WP pin and STATUS register bits
• Features self-timed erase and write cycles with automatic internal timing control
• Provides sequential read capability with automatic address pointer incrementation

Applications

• Microcontroller system data storage
• Configuration parameter retention
• Calibration value storage
• Device identification information logging

Procurement Notes

Verify the specific suffix 'E' confirms the extended temperature grade (-40°C to +125°C) and 'ST' denotes the TSSOP-8 package. Confirm that the required operating voltage aligns with the 2.5V minimum specification for this variant. Ensure the design accommodates the 32-byte page size limitation for write operations. Check for any recent Product Change Notifications regarding assembly or material changes.

Selection Notes

Select this component when extended industrial temperature performance is required alongside standard SPI compatibility. The 2.5V minimum supply voltage distinguishes it from lower-voltage variants like the 25AA320A series. Consider the 32-byte page write constraint during software design to prevent data corruption across page boundaries. Verify that the host microcontroller can support the necessary SPI clock speeds for the target application voltage.

Part Context

This part belongs to the 25XX320A family of 32-Kbit SPI Serial EEPROMs manufactured by Microchip Technology. The family includes variants such as the 25AA320A which supports lower voltage ranges starting at 1.8V. The 25LC320A specifically targets applications requiring robustness in higher temperature environments while maintaining compatibility with standard SPI protocols used in embedded systems.

Replacement Considerations

Direct replacements include other 25LC320A variants with different packages such as 25LC320A-I/SN (SOIC) or 25LC320A-E/MS (MSOP). Cross-family substitution with 25AA320A requires verification of the 1.8V vs 2.5V minimum supply voltage requirements.