11AA040-I/TO

Overview

The Microchip Technology 11AA040-I/TO is a 4Kbit (512 x 8) serial EEPROM utilizing the UNI/O single-wire interface. It operates within a supply voltage range of 1.8V to 5.5V and supports an industrial temperature range of -40°C to +85°C. The device features a maximum bit rate of 100 kbps, 16-byte page-write buffers, and block write protection capabilities. It offers high reliability with 1,000,000 erase/write cycles and data retention exceeding 200 years.

Feature Summary

• Supports the patented UNI/O single I/O serial bus protocol using Manchester encoding for combined clock and data transmission on the SCIO pin.
• Includes built-in write protection mechanisms such as power-on/off data protection circuits and a configurable write enable latch.
• Features output slope control to eliminate ground bounce and Schmitt trigger inputs for enhanced noise suppression.

Applications

• Interfacing with microcontrollers requiring low-pin-count memory solutions
• Embedded systems needing non-volatile storage for configuration data
• Industrial applications operating within specified temperature ranges

Procurement Notes

Verify the specific package type corresponding to the 'TO' suffix against official documentation before procurement. Confirm that the industrial temperature grade (-40°C to +85°C) aligns with system requirements. Ensure compatibility with the UNI/O protocol implementation in the host controller. Check for any recent product change notifications regarding manufacturing or sourcing updates.

Selection Notes

Select this component when a single-wire interface is required to minimize PCB trace count and pin usage. The 1.8V minimum operating voltage makes it suitable for low-power applications compared to devices requiring higher voltages. Consider the 16-byte page buffer size for write efficiency and the block protection features for data integrity needs.

Part Context

This part belongs to the 11AAXXX/11LCXXX family of serial EEPROMs from Microchip Technology. The 'AA' designation indicates support for low-voltage operation down to 1.8V, distinguishing it from the 'LC' series which typically requires a minimum of 2.5V. All members share the same UNI/O interface architecture and command set.

Replacement Considerations

Compatible substitutes within the same family include the 11AA040-I/P, 11AA040-I/SN, and 11AA040-I/MS, provided the physical package footprint matches the design constraints. Verify that alternative packages maintain the same electrical characteristics and temperature ratings.