11AA040T-I/MS

Overview

The Microchip Technology 11AA040T-I/MS is a 4 Kbit (512 x 8) serial electrically erasable programmable read-only memory (EEPROM). It utilizes the UNI/O single I/O bus interface with Manchester encoding for clock and data transmission. The device operates within a supply voltage range of 1.8 V to 5.5 V and supports a maximum bit rate of 100 kbps. It features industrial temperature ratings from -40°C to +85°C, housed in an MSOP-8 package.

Feature Summary

• Supports the patented UNI/O single I/O serial bus protocol using Manchester encoding on the SCIO pin.
• Includes a 16-byte page-write buffer for efficient sequential data storage operations.
• Features built-in write protection mechanisms including power-on/off data protection and a write enable latch.
• Provides block write protection capabilities allowing configuration to protect none, one-quarter, one-half, or all of the memory array.

Applications

• Interfacing with microcontrollers requiring low-pin-count serial memory solutions
• ASIC applications needing non-volatile data storage with minimal I/O overhead
• Industrial control systems operating within specified temperature ranges

Procurement Notes

Verify that the ordering suffix 'T' corresponds to tape-and-reel packaging as indicated by distributor listings. Confirm the 'I' suffix denotes the industrial temperature range (-40°C to +85°C). Ensure the 'MS' suffix matches the required MSOP-8 package type. Cross-reference the manufacturer part number with official datasheets to confirm compatibility with specific system voltage requirements.

Selection Notes

Select this component when a single-wire serial interface is preferred over standard I2C or SPI protocols to conserve GPIO pins. Choose the 11AA040 variant specifically for its 4 Kbit capacity and 1.8 V minimum operating voltage, distinguishing it from the 2.5 V minimum 11LC series. Consider the MSOP-8 package for surface-mount assembly constraints.

Part Context

This device belongs to the Microchip 11XX family of serial EEPROMs, which includes densities ranging from 1 Kbit to 16 Kbit. The family shares common architectural features such as the UNI/O interface and similar command sets. Variants are differentiated primarily by density (e.g., 11AA010 vs 11AA040), voltage range (AA vs LC series), and temperature grades.

Replacement Considerations

Public confirmed substitute part numbers: 11AA040-I/MS, 11AA040-I/SN, 11AA040-I/P. These variants share identical electrical characteristics and functionality but differ in physical package type (SOIC, PDIP).