25LC320AT-I/SN

Overview

The Microchip Technology 25LC320AT-I/SN is a 32-Kbit Serial Electrically Erasable PROM featuring a 4096 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, reducing to 5 MHz at 2.5V–4.5V and 3 MHz at 1.8V–2.5V. The device operates within a supply voltage range of 2.5V to 5.5V for the Industrial temperature grade (-40°C to +85°C). It includes a 32-byte page buffer, self-timed write cycles up to 5 ms, and block write protection capabilities.

Feature Summary

• Supports high-speed SPI communication with hold functionality for interrupt servicing
• Provides hardware and software-based write protection mechanisms including power-on data protection
• Features low-power CMOS technology with standby current as low as 1 µA

Applications

• Microcontroller system data storage
• Configuration parameter retention
• Calibration data logging

Procurement Notes

Verify that the specific ordering suffix matches the required package type and temperature grade. Confirm the voltage range requirements align with the LC series specifications (2.5V minimum) rather than the AA series. Ensure the industrial temperature rating meets the operational environment constraints before finalizing procurement.

Selection Notes

Select this component when a 32-Kbit EEPROM with SPI interface is required. The SN suffix indicates an 8-lead SOIC package. Consider the 25AA320A variant if operation below 2.5V is necessary, as it supports a 1.8V lower limit. Verify that the 10 MHz clock speed requirement is compatible with the target supply voltage conditions.

Part Context

This part belongs to the 25LC320A family of 32-Kbit Serial EEPROMs manufactured by Microchip Technology. It shares functional similarities with the 25AA320A but differs in operating voltage ranges. The family is designed for applications requiring non-volatile memory access via standard SPI protocols.

Replacement Considerations

The 25LC320A-I/SN is a direct equivalent. Check for availability of the 25LC320T-I/ST if TSSOP packaging is preferred.