25C320-E/P

Memory IC Overview

The Microchip Technology 25C320-E/P is a 32 Kbit (4096 x 8) serial Electrically Erasable PROM. It operates within a voltage range of 4.5V to 5.5V and supports a maximum clock frequency of 3 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). It offers high reliability with an endurance of 1 million erase/write cycles and data retention exceeding 200 years. The component is housed in an 8-pin PDIP package and is rated for an industrial temperature range of -40°C to +85°C.

Memory IC Feature Summary

• Supports block write protection allowing selection of none, one-quarter, one-half, or all array segments.
• Includes built-in power on/off data protection circuitry and a write enable latch.
• Features a hold pin to suspend transmission without resetting the serial sequence.

Memory IC Applications

• Microcontroller system data storage
• Industrial control applications
• Automotive electronics

Memory IC Procurement Notes

Verify the specific suffix 'E' confirms the automotive temperature grade (-40°C to +125°C) and 'P' indicates the 8-pin PDIP package. Confirm that the 4.5V to 5.5V supply requirement aligns with the target system design. Note that this datasheet marks the device as not recommended for new designs; verify if the updated 25AA320A or 25LC320A series is preferred for current projects.

Memory IC Selection Notes

Select this part when a higher operating voltage (4.5V-5.5V) and faster clock speed (up to 3 MHz) are required compared to lower-voltage EEPROM variants. Ensure the application environment falls within the specified industrial or automotive temperature ranges. Consider the 8-pin PDIP package constraints for PCB layout and assembly methods.

Memory IC Part Context

The 25C320 belongs to the 25XX320 family alongside the 25AA320 and 25LC320. While functionally similar, the 25C320 is distinguished by its stricter voltage requirements (4.5V-5.5V) and higher maximum clock frequency (3 MHz). It shares the same 32 Kbit capacity and SPI interface architecture as its counterparts.

Memory IC Replacement Considerations

The datasheet explicitly states that the 25C320 is not recommended for new designs. Recommended alternatives include the 25AA320A or 25LC320A. Verify compatibility regarding voltage levels and clock speeds when substituting these newer models.

Memory IC FAQ

What is the maximum clock frequency for the 25C320?

The maximum clock frequency is 3 MHz when the supply voltage is between 4.5V and 5.5V.

How does the HOLD pin function?

The HOLD pin allows the user to pause serial communication without resetting the sequence. It must be held low while SCK is low to invoke the function and brought high while SCK is low to resume.