Microchip Technology 11AA080T-I/MS

Overview

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

For engineers reviewing the 11AA080T-I/MS datasheet, 11AA080T-I/MS pinout, 11AA080T-I/MS application, or 11AA080T-I/MS equivalent, key selection considerations include its 1.8V minimum VCC, UNI/O® bus timing tolerance (±0.5% frequency drift per byte), built-in block write protection (0%, 25%, 50%, or 100% array), and MSOP-8 package compatibility with legacy 8-pin footprint designs.

Technical Context

The 11AA080T-I/MS implements Manchester-encoded serial communication over a single SCIO line, extracting clock and data from one signal stream without external clock lines. Its internal architecture includes a status register with WIP and WEL bits, 16-byte page latches, and re-synchronization circuitry tolerant to ±0.06 UI input edge jitter and ±5% total frequency deviation per command.

It supports four UNI/O® command modes: Read (0x03), Current Address Read (0x06), Write (0x6C), and Status Register access (0x05/0x6E), with all operations requiring start header synchronization and MAK/NoMAK handshaking. Write enable latch control (WREN/WRDI) and nonvolatile block protection (BP0/BP1) are managed via the STATUS register.

Key Specifications

Pinout & Package

11AA080T-I/MS is housed in an 8-lead MSOP (Mini Small Outline Package) with exposed pad, measuring 3.0 mm × 3.0 mm × 1.0 mm. Pin 1 is marked with a dot; pin numbering follows standard MSOP convention (counterclockwise from mark).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C08C-SSHM-T, 11AA080T-I/MS saves one MCU GPIO and simplifies layout at the cost of lower max bit rate (100 kbps vs. 1 Mbps); compared with 11LC080T-I/MS, it extends low-voltage operation to 1.8V while maintaining identical timing, protection, and package - making it the sole choice for 1.8V–2.5V systems.

Availability

11AA080T-I/MS is available at Aetrix Electronics and suitable for smart meter calibration storage, medical device configuration backup, and automotive cabin controller settings requiring stable component supply across extended product lifecycles.

Supply support for 11AA080T-I/MS 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 global manufacturing and quality certifications including ISO 9001 and AEC-Q200.

The 11AA080T-I/MS belongs to Microchip's 11XX UNI/O® EEPROM family, designed specifically for ultra-low-pin-count embedded systems where minimizing MCU GPIO usage and PCB area is critical - especially in battery-powered and space-constrained applications.

FAQ

What is the minimum supply voltage required for reliable operation of the 11AA080T-I/MS?

The 11AA080T-I/MS operates reliably down to 1.8V across its full industrial temperature range (–40°C to +85°C). Below 2.5V, DC characteristics such as VIH and VIL shift to accommodate low-voltage logic thresholds, and read/write currents scale accordingly. This 1.8V capability enables direct integration with energy-harvesting circuits and single-cell Li-ion systems without level-shifting.

How does the UNI/O® bus protocol differ from standard I²C or SPI interfaces in the 11AA080T-I/MS?

The 11AA080T-I/MS uses Manchester encoding on a single SCIO line to embed clock and data, eliminating dedicated clock pins required by I²C and SPI. Unlike I²C, it has no address arbitration or multi-master support; unlike SPI, it lacks separate MOSI/MISO lines. Communication relies on start headers, MAK/NoMAK handshaking, and master-controlled timing - reducing MCU pin count by 2–3 pins versus conventional serial EEPROMs.

Can the 11AA080T-I/MS be used in automotive under-hood applications?

No. The 11AA080T-I/MS is rated only for Industrial temperature range (–40°C to +85°C), not Automotive (–40°C to +125°C). For under-hood use, Microchip's 11LC080T-E/MS (E-temp grade) is specified, though it requires ≥2.5V VCC. The "I" suffix in 11AA080T-I/MS explicitly denotes industrial qualification, and its internal characterization does not cover 125°C operation or AEC-Q100 stress testing.

What happens if a write command crosses a 16-byte page boundary on the 11AA080T-I/MS?

If a page write operation attempts to cross a 16-byte physical page boundary (e.g., writing bytes starting at address 0x0F), the 11AA080T-I/MS wraps the address counter back to the start of the same page (e.g., 0x00), overwriting previously loaded data within that page. This behavior is documented in DS22067J-page 12 and requires firmware to split writes at page boundaries - the device does not auto-segment or fault on boundary violation.

Is the STATUS register of the 11AA080T-I/MS readable during an active write cycle?

Yes. The STATUS register of the 11AA080T-I/MS can be read at any time, including during an internal write cycle. The RDSR instruction (0x05) returns current WIP (Write-In-Progress) and WEL (Write Enable Latch) states, enabling host firmware to poll WIP=0 before initiating subsequent operations. This concurrent accessibility avoids blocking host execution and supports efficient non-blocking EEPROM management in real-time systems.