25LC640AT-M/SN

Overview

The Microchip Technology 25LC640AT-M/SN is a 64 kbit Serial Electrically Erasable PROM featuring an SPI-compatible interface. It utilizes low-power CMOS technology with a supply voltage range of 2.5V to 5.5V and supports clock frequencies up to 10 MHz. The device offers 8192 x 8-bit organization, self-timed erase/write cycles of 5 ms maximum, and block write protection. It operates within extended temperatures from -55°C to 125°C and is housed in an 8-lead SOIC package.

Feature Summary

• Supports serial communication via standard SPI bus signals including SCK, SI, SO, and CS.
• Includes built-in hardware write protection mechanisms such as the WP pin and status register bits.
• Features a HOLD input to pause serial transmission without resetting the sequence.

Applications

• Data storage for microcontroller systems requiring non-volatile memory
• Configuration data retention in industrial control equipment
• Parameter logging in embedded sensor networks

Procurement Notes

Verify the specific suffix 'M' indicates the extended temperature range (-55°C to 125°C) and 'SN' denotes the SOIC package. Confirm that the datasheet DS22144A applies to this variant. Ensure compatibility with system voltage levels and SPI timing requirements before integration.

Selection Notes

Select this component when extended industrial temperature operation is required alongside standard SPI EEPROM functionality. Compare against commercial grade variants if operating conditions remain within standard ranges. Verify page size constraints for write operations to ensure application software handles boundary wrapping correctly.

Part Context

This part belongs to the 25LC640A family of 64 kbit serial EEPROMs manufactured by Microchip Technology. It shares functional similarities with other members of the series but is distinguished by its specific temperature rating and packaging configuration suitable for demanding environments.

Replacement Considerations

Direct substitutes include other 25LC640A variants with different temperature grades or packages, such as 25LC640A-I/SN. Cross-referencing with 25AA640A models may be necessary if voltage specifications differ significantly.