25LC320A-I/SN

Overview

The Microchip Technology 25LC320A-I/SN is a 32-Kbit Serial Electrically Erasable PROM featuring a 4096 x 8-bit organization. It operates 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 supports a supply voltage range of 2.5V to 5.5V and includes a 32-byte page size for efficient writing. It is housed in an 8-lead SOIC package and functions within an industrial temperature range of -40°C to +85°C.

Feature Summary

• Supports high-speed SPI communication with sequential read capabilities and a hold function to pause transmission without resetting the sequence.
• Includes hardware write protection via the WP pin and software block protection through the STATUS register to secure specific memory segments.
• Features built-in power-on/off data protection and a write enable latch to prevent inadvertent writes during operation.

Applications

• Data logging systems requiring non-volatile storage
• Configuration parameter storage in embedded controllers
• Calibration data retention in industrial instrumentation

Procurement Notes

Verify that the ordering suffix matches the required temperature grade and package type, as these define the operational limits and physical form factor. Confirm RoHS compliance status and ensure the specific variant aligns with the system's voltage and interface requirements before finalizing procurement.

Selection Notes

Select this component when a 32-Kbit capacity with SPI interface is required for industrial environments. Ensure the design accommodates the 2.5V to 5.5V supply range and utilizes the 8-lead SOIC footprint. Consider the 10 MHz clock limit based on the operating voltage to guarantee timing compliance.

Part Context

This part belongs to the 25LC320A series of 32-Kbit SPI Serial EEPROMs from Microchip Technology. The 'I' suffix denotes the Industrial temperature rating, while '/SN' specifies the 8-lead Plastic Small Outline (SOIC) package. It complements the 25AA320A series, which offers a wider voltage range starting at 1.8V.

Replacement Considerations

Direct replacements include other 25LC320A variants with different packages or temperature grades, such as 25LC320A-E/MS or 25LC320A-I/P, provided the electrical characteristics and pinout remain compatible with the existing design.

FAQ

How does the HOLD pin function during serial communication?

The HOLD pin allows the host to suspend transmission mid-sequence without resetting the serial pointer. It must be pulled low while SCK is low to pause, and brought high while SCK is low to resume.

What is the purpose of the Write Enable Latch?

The Write Enable Latch must be set via the WREN instruction before any write operation can occur. It resets automatically after power-up, a successful write, or execution of the WRDI instruction to prevent accidental data corruption.