25LC320X-I/ST

Overview

The Microchip Technology 25LC320X-I/ST is a 32 Kbit serial Electrically Erasable PROM featuring a 4096 x 8 bit organization. It operates via a Serial Peripheral Interface (SPI) compatible bus with a maximum clock frequency of 2 MHz. The device supports a supply voltage range of 2.5 V to 5.5 V and functions within an industrial temperature range of -40 °C to +85 °C. It utilizes low-power CMOS technology, offering high reliability with over 1 million erase/write cycles and data retention exceeding 200 years.

Feature Summary

• Supports block write protection allowing selective array segments to be protected from modification.
• Includes built-in power on/off data protection circuitry to prevent inadvertent writes during power transitions.
• Features a hold pin that suspends serial communication without resetting the current sequence.

Applications

• Microcontroller system configuration storage
• Calibration parameter persistence
• Log data caching

Procurement Notes

Verify the specific suffix against official datasheets to confirm package type and electrical characteristics. Confirm the operating temperature range matches the application requirements. Ensure the SPI interface timing aligns with the host controller capabilities. Check for any recent product change notifications regarding manufacturing or packaging updates.

Selection Notes

Select this component for applications requiring non-volatile memory with simple serial interface control. Consider the page write size and block protection features when designing the memory management logic. Evaluate the power consumption specifications against system battery life requirements. Ensure the physical package fits the available PCB space constraints.

Part Context

This part belongs to the 25XX320 family of serial EEPROMs manufactured by Microchip Technology. The family includes variants with different voltage ranges and clock speeds. This specific model targets industrial environments with standard SPI compatibility. It serves as a reliable storage solution for small data sets in embedded systems.

Replacement Considerations

Datasheet indicates the 25LC320A as the recommended replacement for new designs. Verify pinout and instruction set compatibility before substitution. Confirm voltage and temperature specifications match the original design requirements.

FAQ

How does the HOLD pin function during serial communication?

The HOLD pin allows the user to pause transmission mid-sequence without resetting the address pointer. The device ignores input transitions while held low, resuming operation when the pin returns high.

What is the purpose of the Write Enable Latch?

The Write Enable Latch must be set before any write operation can occur. It resets automatically after power-up, successful write execution, or upon receiving a Write Disable instruction.