25LC320-I/P

Overview

The Microchip Technology 25LC320-I/P is a 32 Kbit (4096 x 8 bit) serial Electrically Erasable PROM. It operates within a voltage range of 2.5 V to 5.5 V and supports a maximum clock frequency of 2 MHz. The device utilizes a Serial Peripheral Interface (SPI) compatible bus for communication, featuring separate data in (SI) and data out (SO) lines synchronized by a clock input (SCK). Designed for industrial applications, it functions reliably across a temperature range of -40°C to +85°C and is housed in an 8-pin PDIP package.

Feature Summary

• Supports sequential read operations with automatic address pointer incrementation
• Includes built-in write protection via hardware pin and software status register bits
• Features self-timed erase and write cycles initiated by chip select transitions
• Provides power-on/off data protection circuitry to prevent inadvertent writes

Applications

• Microcontroller system data storage
• Configuration parameter retention
• Calibration value archiving

Procurement Notes

Verify the specific suffix 'I' confirms the Industrial temperature grade (-40°C to +85°C) and 'P' denotes the 8-pin PDIP package. Confirm that the 2.5 V minimum operating voltage aligns with the target system supply rails, as this variant differs from lower-voltage alternatives like the 25AA320. Ensure the design accounts for the required write enable latch sequence before initiating any programming cycles.

Selection Notes

Select this component when a 2.5 V minimum supply voltage is acceptable and SPI interface compatibility is required. It serves as a direct replacement for legacy 25LC320 designs but is superseded by the 25LC320A series for new developments. Consider the 25AA320 if operation down to 1.8 V is necessary, or the 25C320 for higher speed requirements up to 3 MHz at elevated voltages.

Part Context

This part belongs to the 25XX320 family of 32 Kbit serial EEPROMs manufactured by Microchip Technology. The datasheet DS21227F groups it with the 25AA320 and 25C320 variants, which share identical pinouts and instruction sets but differ in electrical specifications such as operating voltage ranges and maximum clock frequencies. The '25LC' designation specifically indicates the low-power CMOS technology optimized for the 2.5 V to 5.5 V range.

Replacement Considerations

The manufacturer notes that this device is not recommended for new designs and suggests using the 25LC320A instead. The 25LC320A offers improved performance characteristics while maintaining pin compatibility.