11LC040T-E/SN

Overview

The Microchip Technology 11LC040T-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 mechanism.
• Features Schmitt trigger inputs for noise suppression and output slope control to eliminate ground bounce.
• Provides hardware block write protection allowing configuration to protect none, 1/4, 1/2, or all of the array.

Applications

• Microcontroller system data storage
• Automotive electronic modules
• Industrial control systems
• ASIC memory integration

Procurement Notes

Verify the specific ordering suffix 'E' confirms the extended automotive temperature rating (-40°C to +125°C) rather than the standard industrial range. Confirm that the 'SN' suffix corresponds to the 8-lead SOIC package type. Ensure the 'T' designation matches the required reel packaging format for surface-mount assembly processes.

Selection Notes

Select this component when a single-wire interface is required to minimize pin count on the host microcontroller. Choose the 11LC040T-E/SN specifically for applications requiring automotive-grade reliability and wide operating temperature ranges. Consider the 16-byte page buffer size for optimizing write throughput in memory-intensive tasks.

Part Context

This part belongs to the 11XX family of serial EEPROMs, which includes densities ranging from 1Kbit to 16Kbit. The family shares common architectural features such as the UNI/O bus interface and similar command sets. Variants within the family differ primarily in storage capacity, voltage requirements, and temperature ratings.

Replacement Considerations

The 11AA040 series serves as a functional substitute with identical interface and organization but supports lower voltages down to 1.8V. Verify that the replacement variant meets the specific voltage and temperature requirements of the target application.

FAQ

How does the device handle synchronization with the master clock?

The device uses a start header consisting of a low pulse followed by an 8-bit code to synchronize its internal clock period with the master's clock period before any operation begins.

What happens if a page write crosses a physical page boundary?

If a page write attempts to cross a boundary, the address counter rolls over to the beginning of the current page, causing the new data to overwrite existing data at the start of that page instead of continuing to the next page.