Microchip Technology 11AA010T-I/TT

Overview

11AA010T-I/TT from Microchip Technology Inc. is a 1 Kbit (128 × 8) serial EEPROM with UNI/O® single I/O bus interface, operating from 1.8V to 5.5V, featuring 16-byte page write buffer, 1 µA max standby current (I-temp), and Schmitt-trigger SCIO input for noise immunity. It is used in space-constrained embedded systems for storing calibration data, configuration settings, or firmware identifiers.

For engineers reviewing the 11AA010T-I/TT datasheet, 11AA010T-I/TT pinout, 11AA010T-I/TT application, or 11AA010T-I/TT equivalent, key selection considerations include its 3-lead SOT-23 (TT) package, UNI/O® protocol timing compliance (10–100 kHz bus frequency), industrial temperature range (−40°C to +85°C), and built-in write protection via STATUS register BP0/BP1 bits.

Technical Context

The 11AA010T-I/TT implements Manchester-encoded serial communication over a single SCIO line, extracting clock and data from one signal stream. Its internal architecture includes a 16-byte page latch, STATUS register with WIP/WEL/BP bits, and current-limited slope-controlled output driver to suppress ground bounce.

It supports self-timed write cycles (5–10 ms), block write protection (none/¼/½/all array), and automatic erase-before-write. The device enters Standby mode after NoMAK+SAK or standby pulse, and Idle mode on invalid address/command-both requiring explicit reset via SCIO transition or standby pulse.

Key Specifications

Pinout & Package

11AA010T-I/TT is housed in a 3-lead SOT-23 package (TT suffix), with pin 1 = SCIO, pin 2 = VSS, pin 3 = VCC. No NC pins are present in this variant; all three terminals are functional and electrically defined.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial EEPROM applications.

Compared with 11AA010T-I/TT, AT21CS01-SSHM-T and BR24G01FJ-3GE2 require additional MCU GPIO resources and lack native single-wire simplicity, making them less suitable for ultra-miniaturized or pin-limited designs where SCIO-only connectivity delivers tangible layout and firmware simplification.

Availability

11AA010T-I/TT is available at Aetrix Electronics and suitable for smart sensors, IoT edge nodes, medical diagnostics equipment, and industrial PLCs requiring stable component supply with guaranteed long-term manufacturability.

Supply support for 11AA010T-I/TT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology Inc. is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and memory products, with emphasis on embedded control and low-power solutions.

The 11AA010T-I/TT belongs to Microchip's UNI/O® serial EEPROM family, designed specifically for cost-sensitive, space-constrained applications needing minimal MCU pin usage and robust nonvolatile storage at 1.8V.

FAQ

What is the UNI/O® interface, and how does it differ from I²C or SPI for the 11AA010T-I/TT?

The UNI/O® interface of the 11AA010T-I/TT uses Manchester encoding on a single SCIO line to embed clock and data, eliminating dedicated clock pins required by I²C or SPI. This reduces MCU pin count to one GPIO, simplifies PCB routing, and avoids clock skew issues. Unlike I²C, it has no address arbitration or multi-master capability; unlike SPI, it needs no chip select or separate data lines - all communication is serialized through SCIO with master-controlled timing.

Does the 11AA010T-I/TT support write protection, and how is it configured?

Yes, the 11AA010T-I/TT supports hardware block write protection via BP0 and BP1 bits in its STATUS register. These bits are programmed using the WRSR instruction and persist across power cycles. They allow locking 0%, 25%, 50%, or 100% of the memory array. Protection is enforced at the hardware level - attempts to write protected pages result in ignored data and no status change, ensuring fail-safe configuration integrity.

What is the maximum write speed and timing behavior of the 11AA010T-I/TT during a page write?

The 11AA010T-I/TT performs self-timed internal write cycles taking 5 ms (byte) or 10 ms (page) after receipt of the final NoMAK. During this time, the WIP bit in the STATUS register reads '1'. The device accepts no new commands until completion. Bus frequency (10–100 kHz) governs command transmission speed, but actual write latency is fixed and independent of bus rate - critical for deterministic firmware timing in real-time systems using 11AA010T-I/TT.

Can the 11AA010T-I/TT operate reliably at 1.8V, and what are the implications for system design?

Yes, the 11AA010T-I/TT is fully specified down to 1.8V VCC, with verified read/write functionality, 1 µA max standby current, and valid timing margins across −40°C to +85°C. This enables direct connection to 1.8V logic families and ultra-low-power MCUs without level-shifting. System designers benefit from simplified power architecture, reduced BOM count, and compatibility with energy-harvesting sources - all while maintaining full EEPROM functionality in the 11AA010T-I/TT.

How does the 11AA010T-I/TT handle bus errors or communication loss during a write operation?

If communication is lost mid-command (e.g., missing MAK, invalid edge, or timeout), the 11AA010T-I/TT enters Idle mode and ignores subsequent data until a valid standby pulse (SCIO high ≥600 µs) resets it. During an active write cycle, loss of bus control does not abort the internal erase-program sequence - the WIP bit remains asserted until completion. Host firmware must poll WIP after recovery to confirm write success before proceeding, ensuring data integrity in noisy or intermittent environments using 11AA010T-I/TT.