11AA161T-I/TT

Overview

The Microchip Technology 11AA161T-I/TT is a 16 Kbit (2,048 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 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.
• 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
• Device identification and parameter storage

Procurement Notes

Verify that the ordering suffix 'TT' corresponds to the SOT-23-3 package and 'I' indicates the Industrial temperature range (-40°C to +85°C). Confirm the '1' in the model number denotes the specific device address code (0xA1) required for your bus topology. Ensure the design accommodates the single-wire UNI/O protocol timing requirements rather than standard I2C interfaces.

Selection Notes

Select this component when a single bidirectional data line is required to minimize PCB trace count. It is suitable for applications needing low standby current and robust write protection mechanisms. Compare with the 11LC161 series if the application requires a minimum operating voltage of 2.5V instead of 1.8V. Verify that the master controller can implement the specific UNI/O handshake and Manchester encoding logic.

Part Context

This part belongs to the 11XX family of Serial Electrically Erasable PROMs from Microchip Technology. The family includes variants with densities ranging from 1 Kbit to 16 Kbit. The 'AA' prefix indicates support for low-voltage operation down to 1.8V, while the '1' suffix specifies the hardwired device address code used for bus selection.

Replacement Considerations

The 11AA161T-E/TT is an equivalent part offering the same electrical specifications but rated for an extended automotive temperature range (-40°C to +125°C).