25LC512T-E/SN16KVAO

Overview

The Microchip Technology 25LC512T-E/SN16KVAO is a 512 Kbit (64K x 8) serial EEPROM utilizing an SPI-compatible interface. It operates within a voltage range of 2.5 V to 5.5 V and supports clock frequencies up to 10 MHz at lower voltages or 20 MHz at higher voltages. The device features a 128-byte page size, 1 million erase/write cycle endurance, and data retention exceeding 200 years. It includes sector write protection, deep power-down modes, and AEC-Q100 automotive qualification. The component is housed in an 8-lead SOIC package.

Feature Summary

• Supports byte and page-level write operations with self-timed erase cycles without requiring prior sector erasure.
• Includes hardware write protection via the WP pin and software block protection through the STATUS register.
• Features a HOLD input to suspend serial communication without resetting the sequence for interrupt servicing.
• Provides electronic signature reading and deep power-down mode for low-power applications.

Applications

• Automotive embedded systems requiring AEC-Q100 qualified non-volatile memory
• Microcontroller configuration storage and calibration parameter persistence
• Industrial control systems needing high reliability and extended temperature operation

Procurement Notes

Verify the specific suffix 'T' indicates tape-and-reel packaging and 'E' confirms the extended temperature grade (-40°C to +125°C). Confirm the 'SN' designation corresponds to the SOIC-8 package variant. Ensure compatibility with system voltage levels and SPI timing requirements before integration.

Selection Notes

Select this part for applications requiring automotive-grade reliability and extended temperature ranges. The 512 Kbit capacity suits moderate data storage needs. Consider the 10 MHz maximum clock speed at 2.5V if operating at lower supply voltages. Verify that the 128-byte page size aligns with write buffer constraints in the host microcontroller design.

Part Context

This component belongs to the Microchip 25LC series of SPI serial EEPROMs. It shares architectural similarities with other members like the 25LC256 and 25LC1024 but differs in memory density. The 'E' suffix denotes the extended industrial temperature range, distinguishing it from the standard industrial 'I' grade variants.

Replacement Considerations

Direct substitutes include the 25LC512-I/SN for standard industrial temperature ranges or the 25LC512-E/MF for DFN-S packaging. Cross-vendor equivalents such as the AT25SL512 or M95512 may require firmware adjustments due to differing instruction sets or timing parameters.

FAQ

Does the 25LC512 require a separate erase command before writing?

No, the device supports auto-erase during write operations. Byte and page writes automatically trigger the necessary internal erase cycles.

How is the HOLD function utilized?

The HOLD pin allows the host to pause serial communication by pulling it low while SCK is low. This suspends data transfer without resetting the address pointer, allowing the host to service interrupts before resuming.

What is the purpose of the RDID command?

The Release from Deep Power-Down and Read Electronic Signature (RDID) command exits deep power-down mode and outputs an 8-bit electronic signature on the SO pin for device identification.