11AA161-I/MS

Overview

The Microchip Technology 11AA161-I/MS 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, block write protection, and built-in power-on/off data protection. It is housed in an 8-lead MSOP package and rated for industrial temperature operation from -40°C to +85°C.

Feature Summary

• Supports the patented UNI/O single I/O serial protocol using Manchester encoding on a dedicated SCIO pin.
• Includes a STATUS register with Write-In-Progress and Write Enable Latch bits for operational control.
• Features hardware-based block write protection allowing configuration of none, 1/4, 1/2, or all array segments.
• Integrates output slope control to eliminate ground bounce and Schmitt trigger inputs for noise suppression.

Applications

• Microcontroller systems requiring low-pin-count non-volatile memory storage
• Embedded devices needing secure parameter retention with minimal interface overhead
• Battery-powered applications utilizing low standby current capabilities

Procurement Notes

Verify that the specific ordering suffix matches the required package type and temperature grade. Confirm the device address code corresponds to the '1' variant (hardwired to '0001') for proper bus addressing. Ensure the design accounts for 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 preferred over two-wire interfaces like I2C. The 11AA161 differs from the 11AA160 by its fixed device address code, enabling multiple devices on the same bus without external pull-ups or address pins. Verify compatibility with the master controller's ability to generate Manchester-encoded signals.

Part Context

This part belongs to the 11XX family of Serial Electrically Erasable PROMs, which includes densities from 1 Kbit to 16 Kbit. The family supports both UNI/O and I2C interfaces depending on the specific model prefix. The 11AA series specifically denotes low-voltage operation starting at 1.8V, distinguishing it from the 11LC series which requires a minimum of 2.5V.

Replacement Considerations

Public confirmed substitute part numbers only; omit otherwise.