11LC040-E/SN

Overview

The Microchip Technology 11LC040-E/SN is a 4Kb (512 x 8) serial EEPROM utilizing the UNI/O single-wire interface. It operates within a voltage range of 2.5V to 5.5V and supports a maximum clock frequency of 100 kHz. The device features a 16-byte page-write buffer, self-timed write cycles, and block write protection. It is housed in an 8-lead SOIC package and rated for automotive temperature ranges from -40°C to +125°C.

Feature Summary

• Supports the patented UNI/O single I/O serial bus protocol using Manchester encoding
• Includes built-in power-on/off data protection and a write enable latch
• Features Schmitt trigger inputs for noise suppression and output slope control
• Provides hardware block write protection with selectable array segments

Applications

• Microcontroller system configuration storage
• Automotive electronic component parameter logging
• Industrial sensor calibration data retention
• Embedded device identification and security keys

Procurement Notes

Verify the specific suffix 'E' confirms the extended automotive temperature rating (-40°C to +125°C) rather than the standard industrial range. Confirm the 'SN' designation corresponds to the 8-lead SOIC package type. Ensure compatibility with the master controller's ability to generate the required UNI/O Manchester encoded signals and standby pulses.

Selection Notes

Select this part when a single-pin serial interface is required to minimize pin count on the host microcontroller. Choose the E-temperature grade if the application environment exceeds standard industrial limits. Consider the 16-byte page buffer size for efficient data writing operations compared to byte-by-byte programming methods.

Part Context

This component belongs to the 11XX family of serial EEPROMs, which includes densities ranging from 1Kbit to 16Kbit. The 11LC series specifically targets applications requiring operation voltages starting at 2.5V, distinguishing it from the 11AA series which supports lower voltages down to 1.8V. All members share the same core UNI/O architecture.

Replacement Considerations

The 11LC040-I/SN serves as the industrial temperature equivalent. For lower voltage requirements, the 11AA040-SN is functionally compatible but supports 1.8V operation. Cross-referencing with other manufacturers requires verifying UNI/O protocol support or implementing software bit-banging alternatives.