Microchip Technology 11AA080T-I/MNY

Overview

11AA080T-I/MNY from Microchip Technology is an 8 Kbit (1,024 × 8) serial EEPROM with UNI/O® single I/O bus interface, operating from 1.8V to 5.5V, featuring 16-byte page write buffer, Schmitt-trigger SCIO input, and 1 µA max standby current at industrial temperature (–40°C to +85°C). It is used in space-constrained embedded systems for nonvolatile parameter storage, calibration data retention, and firmware configuration.

For engineers reviewing the 11AA080T-I/MNY datasheet, 11AA080T-I/MNY pinout, 11AA080T-I/MNY application, or 11AA080T-I/MNY equivalent, key selection criteria include its 1.8V low-voltage operation, Manchester-encoded UNI/O timing tolerance (±0.5% frequency drift per byte), built-in block write protection (1/4, 1/2, or full array), and compatibility with microcontroller GPIOs lacking dedicated SPI/I²C peripherals.

Technical Context

The 11AA080T-I/MNY implements a Manchester-encoded, master-controlled UNI/O® bus protocol on a single bidirectional SCIO line, eliminating need for separate clock or chip-select signals. 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), automatic erase-before-write, and re-synchronization on every MAK bit to tolerate edge jitter (±0.06 UI) and bus frequency drift. Standby mode is entered after NoMAK/SAK termination or explicit standby pulse (≥600 µs high on SCIO).

Key Specifications

Pinout & Package

11AA080T-I/MNY is packaged in an 8-lead MSOP (MN) package with exposed pad, measuring 3.0 mm × 3.0 mm × 1.0 mm. Pin 1 is SCIO (bidirectional serial clock/data), Pin 2 is VSS (ground), Pin 3 is NC (no connect), Pin 4 is NC, Pin 5 is NC, Pin 6 is NC, Pin 7 is VCC (supply), Pin 8 is NC. The NC pins are internally unconnected and must be left floating or tied to VSS/VCC per layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 11AA080T-I/MNY, the 11LC080T-I/MNY sacrifices 1.8V operation for identical feature set at higher supply voltages, while the AT24C08D-SSHM-T trades single-pin simplicity for broader ecosystem support but increases GPIO and layout complexity.

Availability

11AA080T-I/MNY is available at Aetrix Electronics and suitable for industrial automation, medical instrumentation, and consumer appliance designs requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for 11AA080T-I/MNY 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 leading provider of microcontrollers, analog components, and memory solutions, headquartered in Chandler, Arizona, with global manufacturing and support infrastructure.

The 11AAxxx family was designed specifically for cost-sensitive, space-constrained embedded systems needing reliable nonvolatile storage with minimal GPIO resource usage - targeting applications where SPI or I²C interfaces are unavailable or over-provisioned.

FAQ

What is the UNI/O® bus interface used by the 11AA080T-I/MNY?

The 11AA080T-I/MNY uses Microchip's patented UNI/O® bus - a single-wire, Manchester-encoded serial interface that combines clock and data on the SCIO pin. Unlike I²C or SPI, it requires no separate clock, chip-select, or data lines, enabling communication using only one GPIO. This simplifies firmware development and reduces PCB routing complexity, especially in 3-pin SOT-23 variants of the same family.

Does the 11AA080T-I/MNY support 1.8V operation, and what are the implications?

Yes, the 11AA080T-I/MNY operates from 1.8V to 5.5V, making it compatible with modern ultra-low-power MCUs such as PIC12LF, SAM L21, or nRF52 series. At 1.8V, active current remains ≤1 mA and standby current stays ≤1 µA, enabling true low-energy design. This eliminates level-shifters needed for 11LC080T-I/MNY (2.5–5.5V only) in battery-powered systems.

How does the 11AA080T-I/MNY handle write protection and data security?

The 11AA080T-I/MNY provides dual-layer write protection: hardware-based power-on write disable (WEL reset at POR/BOR) and software-configurable block protection via BP0/BP1 bits in the STATUS register. These bits allow locking 0%, 25%, 50%, or 100% of the 8 Kbit array. Combined with the write enable latch (set via WREN command), this prevents accidental or malicious overwrites of critical calibration or configuration data.

What is the maximum write speed and page buffer size of the 11AA080T-I/MNY?

The 11AA080T-I/MNY supports a maximum bus frequency of 100 kHz (100 kbps effective bit rate) and features a 16-byte page write buffer. A full page write completes in ≤10 ms (typical). To maximize throughput, firmware should align writes to 16-byte boundaries and avoid crossing page edges - otherwise, data wraps to the start of the same page instead of advancing to the next.

Can the 11AA080T-I/MNY be used in automotive applications?

No, the 11AA080T-I/MNY is rated for Industrial temperature range only (–40°C to +85°C) and carries the "I" suffix. For automotive applications requiring –40°C to +125°C, Microchip offers the pin-compatible 11LC080T-E/MNY variant. While both share identical density, interface, and command set, the "E" version undergoes extended qualification testing per AEC-Q100 and supports the wider voltage range (2.5–5.5V), excluding 1.8V operation.