25LC320AT-E/SN

Overview

The Microchip Technology 25LC320AT-E/SN is a 32-Kbit Serial Electrically Erasable PROM featuring an SPI-compatible interface. It operates within a voltage range of 2.5V to 5.5V and supports clock frequencies up to 10 MHz at 5.5V. The device utilizes an 8-lead SOIC package and provides a memory organization of 4096 x 8 bits with a 32-byte page size. It functions across an extended temperature range from -40°C to +125°C.

Feature Summary

• Supports serial communication via a standard SPI bus with separate data input and output lines.
• Includes hardware write protection controlled by the WP pin and STATUS register bits.
• Features a HOLD input to pause transmission without resetting the sequence.

Applications

• Data storage in microcontroller systems
• Configuration parameter retention
• Calibration value storage

Procurement Notes

Verify that the ordering suffix 'E' corresponds to the Extended temperature grade (-40°C to +125°C) and 'SN' indicates the 8-Lead SOIC package. Confirm the 'T' suffix matches the required tape-and-reel packaging format for automated assembly processes.

Selection Notes

Select this component when a 32-Kbit EEPROM with SPI compatibility is required. Ensure the system voltage remains above 2.5V, as lower voltages are not supported by the LC series. Verify that the operating environment does not exceed the +125°C maximum junction temperature limit.

Part Context

This part belongs to the 25LC320A family of 32-Kbit Serial EEPROMs manufactured by Microchip Technology. The family shares identical functional specifications but varies by voltage range, temperature rating, and physical package type.

Replacement Considerations

The 25LC320A-I/SN serves as a direct substitute if operation within the Industrial temperature range (-40°C to +85°C) is sufficient for the application requirements.

FAQ

How does the HOLD pin function during serial communication?

The HOLD pin suspends transmission while in the middle of a serial sequence. When pulled low, it pauses further communication without resetting the sequence, allowing the host to service higher priority interrupts.

What is the purpose of the Write Enable Latch?

The Write Enable Latch must be set before any write operation will be completed internally. It prevents inadvertent writes to the array and is reset upon power-up or after a successful write cycle.