25C320/P

Memory IC Overview

The Microchip Technology 25C320/P is a 32 Kbit (4096 x 8 bit) serial Electrically Erasable PROM. It operates within a voltage range of 4.5 V to 5.5 V and supports a maximum clock frequency of 3 MHz via an SPI-compatible interface. The device features self-timed erase and write cycles with a maximum cycle time of 5 ms. It offers high reliability, including 1 million E/W cycles endurance, data retention exceeding 200 years, and ESD protection greater than 4000V. The component is housed in an 8-pin PDIP package.

Memory IC Feature Summary

• Supports block write protection for none, 1/4, 1/2, or all array segments
• Includes built-in power on/off data protection circuitry
• Features a dedicated hold pin to pause serial communication without resetting the sequence

Memory IC Applications

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

Memory IC Procurement Notes

Verify that the operating supply voltage strictly remains between 4.5 V and 5.5 V, as this variant does not support lower voltages like the 25LC320A. Confirm the specific industrial temperature range requirements align with the -40°C to +85°C specification. Ensure the design accommodates the 8-pin PDIP through-hole mounting style and standard SPI bus timing constraints.

Memory IC Selection Notes

Select this part when a fixed 5 V logic interface is required, as it lacks the low-voltage compatibility of the 25LC320A series. The 3 MHz clock speed provides faster throughput compared to the 1 MHz limit of the 25AA320. Consider the 8-pin PDIP form factor if prototyping or manufacturing requires through-hole assembly rather than surface mount technology.

Memory IC Part Context

This component belongs to the legacy 25XX320 family, which also includes the 25AA320 and 25LC320 variants. Microchip explicitly notes that this generation is not recommended for new designs, suggesting the use of updated successors like the 25AA320A or 25LC320A instead. The 'P' suffix specifically denotes the 8-pin Plastic Dual In-Line Package.

Memory IC Replacement Considerations

Public confirmed substitute part numbers: 25LC320A-I/P, 25AA320A-I/P.