25CS320T-H/SN

Overview

The Microchip Technology 25CS320T-H/SN is a 32-Kbit (4,096 x 8 bit) SPI Serial EEPROM housed in an 8-lead SOIC package. It operates within a voltage range of 2.5V to 5.5V and supports clock frequencies up to 20 MHz at VCC ≥ 4.5V. The device features a -40°C to +150°C extended temperature rating and includes built-in Error Correction Code (ECC) logic for data integrity.

Feature Summary

• Includes a nonvolatile Security register with a factory-programmed 128-bit serial number and a user-programmable lockable ID page.
• Features Enhanced Write Protection Mode allowing user-definable memory partitions with independent protection behaviors.
• Incorporates Undervoltage Lockout Detection to inhibit write sequences during brown-out events.

Applications

• Automotive applications requiring AEC-Q100 qualification and high-temperature reliability.
• Industrial systems needing dependable nonvolatile memory storage.
• Consumer electronics requiring reliable data retention.

Procurement Notes

Verify the specific suffix 'H' confirms the +150°C extended temperature range and 'SN' indicates the SOIC package. Confirm the 'T' suffix denotes tape and reel packaging. Ensure the component meets AEC-Q100 automotive qualification requirements if applicable to the design.

Selection Notes

Select this part for designs requiring operation up to +150°C ambient temperature. The 25CS320 offers backward compatibility with 25AA320A/25LC320A and AT25320B devices. Consider the enhanced write protection and ECC features for critical data integrity needs.

Part Context

The 25CS320 is part of Microchip's CS series of SPI Serial EEPROMs. This series provides various memory sizes and interfaces, optimized for consumer, industrial, and automotive applications where reliable nonvolatile memory is essential.

Replacement Considerations

The datasheet notes backward compatibility with 25AA320A, 25LC320A, and AT25320B. Verify pinout and electrical specifications match before substituting.

FAQ

What is the function of the HOLD pin?

The HOLD pin allows the host to pause serial communication without resetting the sequence, enabling the system to service higher priority interrupts.

How does the device handle undervoltage conditions?

An Undervoltage Lockout (UVLO) detection circuit inhibits all write sequences when the VCC supply voltage drops below a configurable threshold level.