11AA161-I/TO

Overview

The Microchip Technology 11AA161-I/TO is a 16 Kbit serial EEPROM organized as 2048 x 8 bits. It utilizes the UNI/O single I/O bus interface with a maximum clock frequency of 100 kHz. The device operates on a supply voltage range of 1.8 V to 5.5 V and supports industrial temperature ranges from -40°C to +85°C. It features a 16-byte page-write buffer, block write protection, and high reliability with over 1,000,000 erase/write cycles and data retention exceeding 200 years.

Feature Summary

• Supports the UNI/O single I/O serial bus protocol using Manchester encoding for combined clock and data transmission.
• Includes built-in write protection mechanisms such as power-on/off data protection and a configurable write enable latch.
• Features Schmitt trigger inputs for noise suppression and output slope control to eliminate ground bounce.
• Provides hardware-based block write protection allowing selection of none, one-quarter, one-half, or all array protection.

Applications

• Interfacing with microcontrollers requiring low-pin-count non-volatile memory storage
• ASIC applications needing simple serial configuration data retention
• Embedded systems utilizing discrete I/O lines for memory access

Procurement Notes

Verify that the specific ordering suffix 'TO' corresponds to the TO-92 package type as documented in the official datasheet. Confirm that the 'I' suffix indicates the Industrial temperature range (-40°C to +85°C). Ensure the device address code matches the '1' variant (0xA1) required by your system design. Cross-reference the RoHS compliance status with current manufacturer declarations.

Selection Notes

Select this component when a single-wire serial interface is preferred to minimize pin count compared to standard I2C devices. Choose the 11AA161 variant specifically if the hardwired device address 0xA1 is required to avoid conflicts with other 0xA0 addressed devices on the same bus. Consider the TO-92 package only if through-hole mounting is necessary for the application environment.

Part Context

This part belongs to the 11AAXXX/11LCXXX family of 1 Kbit to 16 Kbit Serial Electrically Erasable PROMs. The 'AA' designation indicates support for low-voltage operation down to 1.8 V, distinguishing it from the 'LC' series which requires a minimum of 2.5 V. The '161' identifier specifies the 16 Kbit density and the unique device address code.

Replacement Considerations

The 11AA160-I/TO is a compatible alternative within the same family but uses a different device address (0xA0 instead of 0xA1). Verify that the system software can accommodate the address change or that no address conflict exists with other 0xA0 devices on the bus.