25C320T/SN

Overview

The Microchip Technology 25C320T/SN is a 32 Kbit serial Electrically Erasable PROM (EEPROM) utilizing a Serial Peripheral Interface (SPI) compatible bus. It features a 4096 x 8 bit organization and operates within a voltage range of 4.5V to 5.5V with a maximum clock frequency of 3 MHz. The device supports self-timed erase and write cycles, block write protection, and built-in power on/off data protection circuitry.

Feature Summary

• Supports SPI-compatible serial communication with separate data in and out lines.
• Includes hardware write-protect pin and software-configurable block protection for array segments.
• Features low-power CMOS technology with standby current typical at 500 nA.

Applications

• Data storage in microcontroller systems requiring non-volatile memory.
• Industrial applications operating within the industrial temperature range.
• Automotive electronics requiring extended temperature reliability.

Procurement Notes

Verify that the specific suffix 'T' corresponds to tape-and-reel packaging if required by assembly equipment, as standard datasheets may list tube packaging. Confirm the 'SN' designation matches the 8-pin SOIC package dimensions. Ensure the supply voltage meets the minimum 4.5V requirement for the 25C320 variant.

Selection Notes

Select this component when a 3 MHz SPI interface speed is necessary alongside a strict 4.5V to 5.5V supply constraint. Consider alternatives like the 25LC320 or 25AA320 if lower voltage operation or different speed requirements apply. Verify that the 8-pin SOIC footprint aligns with the PCB layout constraints.

Part Context

This part belongs to the 25XX320 family of 32 Kbit serial EEPROMs from Microchip Technology. It shares architectural similarities with the 25AA320 and 25LC320 but is distinguished by its higher voltage operating range and faster clock frequency specifications suitable for robust industrial environments.

Replacement Considerations

Public confirmed substitutes include the 25LC320 and 25AA320. Note that these variants differ in supply voltage ranges and maximum clock frequencies compared to the 25C320.

FAQ

How does the HOLD pin function during serial communication?

The HOLD pin suspends transmission without resetting the sequence. It must be held high when not in use and pulled low while SCK is low to pause communication.

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 be completed internally. It resets automatically after power-up or successful write execution.