11AA040T-I/SN

Overview

The Microchip Technology 11AA040T-I/SN is a 4 Kbit (512 x 8) serial EEPROM utilizing the UNI/O single I/O bus interface. It operates within a supply voltage range of 1.8 V to 5.5 V and supports a maximum bit rate of 100 kbps. The device features a 16-byte page-write buffer, self-timed write cycles, and block write protection capabilities. Designed for industrial applications, it functions reliably between -40°C and +85°C. Key electrical characteristics include a typical active current of 1 mA and a maximum standby current of 1 µA.

Feature Summary

• Supports the patented UNI/O single I/O serial bus protocol using Manchester encoding on the SCIO pin.
• Includes built-in power-on/off data protection circuitry and a write enable latch for enhanced reliability.
• 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 memory array.

Applications

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

Procurement Notes

Verify the specific suffix 'SN' corresponds to the SOIC-8 package and 'I' indicates the industrial temperature range (-40°C to +85°C). Confirm that the 'T' designation aligns with the required tape-and-reel packaging format if applicable to your assembly process. Ensure compatibility with the 1.8V minimum operating voltage requirement for your target application design.

Selection Notes

Select this component when a single-wire interface is required to minimize PCB trace count and pin usage. It is suitable for designs needing low standby power consumption and robust data retention exceeding 200 years. Consider the 16-byte page buffer size for efficient write operations. Verify that the master controller can implement the UNI/O Manchester encoding protocol correctly.

Part Context

This part belongs to the 11XX family of serial EEPROMs from Microchip Technology, which includes variants like the 11LC040 and 11AA010. The family shares common UNI/O bus architecture but differs in voltage ranges and density. The 11AA series specifically supports lower voltage operation down to 1.8V compared to the 11LC series.

Replacement Considerations

Direct substitutes within the same package and specification include other 11AA040 variants such as 11AA040-I/SN or 11AA040-I/PDIP if through-hole mounting is acceptable. Cross-family replacements like the 11LC040 require verification of the 2.5V minimum voltage constraint.