11AA020T-I/CS16K

Overview

The Microchip Technology 11AA020T-I/CS16K is a 2 Kbit (256 x 8) serial EEPROM utilizing the UNI/O single-wire interface. It operates within a supply voltage range of 1.8 V to 5.5 V and supports a maximum bus frequency of 100 kHz. The device features industrial temperature ratings from -40°C to +85°C, high endurance of one million erase/write cycles, and data retention exceeding 200 years. It includes a 16-byte page write buffer, block write protection capabilities, and built-in power-on/off data protection circuitry.

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 a STATUS register with Write-In-Progress and Write Enable Latch bits, alongside nonvolatile Block Protection bits for array security.
• Features self-timed write cycles with an auto-erase function and a 16-byte page-write buffer to optimize write throughput.
• Integrates Schmitt trigger inputs for noise suppression and output slope control to eliminate ground bounce during signal transitions.

Applications

• Microcontroller system configuration storage
• Calibration data and parameter logging in embedded devices
• Device identification and unique serial number storage
• Low-pin-count sensor node memory

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current datasheet to confirm package type and tape/reel specifications. Ensure the selected variant matches the required operating temperature range and voltage specifications for the target application environment before finalizing procurement orders.

Selection Notes

Select this component when a single-wire interface is required to minimize PCB trace count and pin usage. It is suitable for applications needing low standby current and robust data retention. Consider the 16-byte page size constraints for write operations and ensure the master controller supports the UNI/O protocol timing requirements.

Part Context

This part belongs to the 11AAXXX family of serial EEPROMs, which also includes variants like the 11AA010, 11AA040, and 11AA160. These devices share the same UNI/O interface and functional architecture but differ in memory density and organization. The family is designed for cost-sensitive, space-constrained embedded systems requiring non-volatile data storage.

Replacement Considerations

Direct replacements include other members of the 11AA020 series such as 11AA020T-I/TT or 11AA020T-I/MS, provided the package footprint is compatible. Cross-family substitutes like the 11LC020 require verification of voltage compatibility as they typically operate at higher minimum voltages.