25LC320AX-I/ST

Overview

The Microchip Technology 25LC320AX-I/ST is a 32-Kbit Serial Electrically Erasable PROM featuring a 4096 x 8-bit organization. It operates via an SPI-compatible serial bus with a maximum clock frequency of 10 MHz at VCC levels between 4.5V and 5.5V. The device supports a supply voltage range of 2.5V to 5.5V and functions within an industrial temperature range of -40°C to +85°C. It utilizes low-power CMOS technology, drawing a maximum standby current of 5 µA. The memory offers high reliability with over 1 million erase/write cycles and data retention exceeding 200 years.

Feature Summary

• Supports sequential read operations and self-timed erase and write cycles with a maximum duration of 5 ms.
• Includes built-in hardware write protection mechanisms such as power-on/off data protection, a write enable latch, and a dedicated write-protect pin.
• Features block write protection capabilities allowing users to protect none, one-quarter, one-half, or the entire memory array.

Applications

• Data storage in microcontroller systems requiring non-volatile memory
• Industrial control applications operating within specified temperature ranges
• Embedded systems utilizing SPI communication protocols

Procurement Notes

Verify that the specific ordering suffix matches the required package type and temperature grade. Confirm the voltage range compatibility with your system design, as this variant operates from 2.5V to 5.5V. Ensure that the source documentation aligns with the exact part number to avoid discrepancies in electrical characteristics or pin configurations.

Selection Notes

Select this component for applications requiring robust data retention and high endurance. Consider the 32-byte page size when designing write algorithms to optimize performance. Verify that the host microcontroller can support the required SPI clock speeds and voltage levels. Evaluate the need for hardware write protection features provided by the WP pin and STATUS register bits.

Part Context

This device belongs to the 25LC320A series of 32-Kbit Serial EEPROMs manufactured by Microchip Technology. It is designed for direct interface with SPI ports found in popular microcontroller families. The series includes variants with different voltage ranges and temperature grades, packaged in various 8-lead formats including TSSOP.

Replacement Considerations

Compatible substitutes include other 25LC320A variants with matching voltage and temperature specifications. Cross-reference package dimensions and pinouts when replacing with devices from different manufacturers. Ensure that any replacement maintains SPI protocol compatibility and similar electrical characteristics.