11AA020-I/TO

Overview

The Microchip Technology 11AA020-I/TO is a 2 Kbit (256 x 8) serial EEPROM utilizing the UNI/O single I/O bus interface. It operates within a supply voltage range of 1.8 V to 5.5 V and supports a maximum clock frequency of 100 kHz. The device features industrial temperature ratings from -40°C to +85°C, housed in a TO-92 package with three leads.

Feature Summary

• Supports the patented UNI/O single I/O serial 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 circuitry and a write enable latch.
• Features Schmitt trigger inputs for noise suppression and output slope control to eliminate ground bounce.
• Provides block write protection allowing configuration to protect none, one-quarter, one-half, or all of the memory array.

Applications

• Interfacing with microcontrollers requiring low-pin-count non-volatile storage
• Embedded systems needing robust data retention in industrial environments
• Applications utilizing discrete I/O lines configured for the UNI/O protocol

Procurement Notes

Verify that the specific ordering suffix corresponds to the TO-92 package variant rather than other available options like SOT-23 or PDIP. Confirm the 'I' designation matches the required industrial temperature range specifications for your application environment.

Selection Notes

Select this component when a single-wire serial interface is preferred to minimize pin count compared to standard SPI or I2C devices. Ensure the system design accommodates the UNI/O protocol timing requirements and utilizes the appropriate start header synchronization sequence.

Part Context

This part belongs to the 11AAXXX/11LCXXX family of serial EEPROMs, which offers densities ranging from 1 Kbit to 16 Kbit. The 11AA series specifically supports lower voltage operation down to 1.8 V, distinguishing it from the 11LC series which typically requires a minimum of 2.5 V.

Replacement Considerations

Compatible substitutes within the same package include the 11AA020-I/P and 11AA020-I/SN. Other density variants in the family such as the 11AA010 or 11AA040 may serve as alternatives if memory capacity differences are acceptable.