25LC512-E/SN

Overview

The Microchip Technology 25LC512-E/SN is a 512 Kbit (64K x 8) serial EEPROM utilizing an SPI-compatible interface. It operates within a voltage range of 2.5V to 5.5V and supports clock frequencies up to 20 MHz at higher voltages or 10 MHz at lower voltages. The device features a maximum access time of 50 ns, a 128-byte page size, and a write cycle time of 5 ms. It is housed in an 8-lead SOIC package and is rated for an extended industrial temperature range from -40°C to +125°C.

Feature Summary

• Supports byte-level and page-level write operations with a 128-byte page buffer.
• Includes sector write protection allowing configuration of none, one-quarter, one-half, or all array sectors.
• Features built-in power-on/off data protection and a dedicated write-protect pin.
• Provides hold functionality to pause serial communication without resetting the sequence.

Applications

• Microcontroller system memory for storing calibration data
• Configuration storage in embedded devices
• Data logging applications requiring non-volatile retention

Procurement Notes

Verify that the ordering suffix 'E' corresponds to the extended temperature range (-40°C to +125°C) rather than the standard industrial range. Confirm the 'SN' suffix indicates the 8-lead SOIC package type. Ensure the specific revision matches the required datasheet version for timing accuracy.

Selection Notes

Select this component when an SPI interface is preferred over I2C for faster data transfer rates up to 20 MHz. Choose the extended temperature grade for environments exceeding standard industrial limits. Verify that the 512 Kbit capacity aligns with the application's storage requirements before finalizing the design.

Part Context

This part belongs to the 25LC512 family of serial EEPROMs manufactured by Microchip Technology. The family offers various package options including PDIP, SOIC, DFN-S, and SOIJ. The 'E' designation specifically denotes the extended temperature variant, distinguishing it from the standard industrial 'I' grade parts within the same product line.

Replacement Considerations

Direct replacements include other 25LC512 variants such as the 25LC512-I/SN for standard industrial temperatures or different packages like the 25LC512-E/MF in DFN-S format. Cross-vendor equivalents must be verified against the SPI protocol and voltage specifications.

FAQ

How does the HOLD pin function during serial communication?

The HOLD pin allows the host to pause transmission mid-sequence without resetting the serial operation. It must be held high when not in use and pulled low while SCK is low to invoke the hold state.

What is the purpose of the Write Enable Latch?

The Write Enable Latch must be set via the WREN instruction before any write, page erase, sector erase, or chip erase operation can be completed. It resets automatically after a successful write or upon power-up.