11LC040T-I/TT

Overview

The Microchip Technology 11LC040T-I/TT is a 4 Kbit (512 x 8) serial EEPROM utilizing the UNI/O single-wire interface. It operates within a voltage range of 2.5 V to 5.5 V and supports a maximum bus 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 a 3-lead SOT-23 package and rated for industrial temperatures from -40°C to +85°C.

Feature Summary

• Supports the patented UNI/O single I/O serial protocol using Manchester encoding on the SCIO pin.
• Includes built-in power-on/off data protection and a write enable latch for array security.
• Features Schmitt trigger inputs for noise suppression and output slope control to eliminate ground bounce.

Applications

• Microcontroller system configuration storage
• Calibration data retention in embedded devices
• Low-pin-count sensor data logging

Procurement Notes

Verify the specific suffix 'I/TT' corresponds to the Industrial temperature range (-40°C to +85°C) and the SOT-23-3 package. Confirm that the 'L' variant requires a minimum 2.5V supply, unlike the 'AA' series which supports 1.8V. Ensure the ordering code matches the exact density and organization required for the design.

Selection Notes

Select this component when a single-wire interface is required to minimize PCB trace count. It is suitable for applications where low active current consumption is critical. The 16-byte page buffer optimizes write throughput compared to byte-by-byte programming. Verify that the host controller can generate the specific Manchester-encoded timing required by the UNI/O protocol.

Part Context

This part belongs to the 11LCXXX family of serial EEPROMs from Microchip Technology. These devices are designed as low-cost, high-reliability non-volatile memory solutions. The family shares common electrical characteristics and command sets, differing primarily in memory density and operating voltage ranges between the LC and AA sub-series.

Replacement Considerations

Direct substitutes include other 11LC040 variants with different packages such as 11LC040-I/P or 11LC040-I/SN. Cross-family replacements like the 11AA040 offer similar functionality but support lower voltages down to 1.8V. Ensure any replacement maintains compatibility with the UNI/O protocol and physical footprint if space is constrained.