Microchip Technology 11LC080T-I/MS

Overview

11LC080T-I/MS from Microchip Technology Inc. is an 8 Kbit (1,024 × 8) serial EEPROM with UNI/O® single I/O bus interface, operating from 2.5V to 5.5V over -40°C to +85°C industrial temperature range. It features 16-byte page-write buffer, Schmitt-trigger SCIO input, output slope control, and built-in write protection including power-on/off circuitry and STATUS register control. It is used in embedded systems for parameter storage, calibration data retention, and configuration memory in space-constrained designs.

For engineers reviewing the 11LC080T-I/MS datasheet, 11LC080T-I/MS pinout, 11LC080T-I/MS application, or 11LC080T-I/MS equivalent, key selection considerations include its 3-lead SOT-23 package compatibility, UNI/O® bus timing tolerance (±0.5% frequency drift per byte), 100 kbps max bit rate, standby current ≤1 µA, and block write protection options (none/1/4/1/2/all array).

Technical Context

The 11LC080T-I/MS implements Manchester-encoded UNI/O® protocol on a single SCIO line, eliminating need for separate clock and data lines. Its internal re-synchronization circuitry tracks master clock period during each command using start header alignment and adjusts phase on every MAK bit to tolerate edge jitter (±0.06 UI) and frequency drift (±0.5% per byte, ±5% per command).

It integrates a current-limited slope-controlled SCIO driver, Schmitt-trigger input for noise immunity, and nonvolatile STATUS register with WIP/WEL/BP bits. Write operations use auto-erase and self-timed cycles (max 10 ms), supported by 16-byte page buffer and hardware write-enable latch that resets on power-up, WRDI, WRSR, or successful WRITE/ERAL/SETAL execution.

Key Specifications

Pinout & Package

11LC080T-I/MS uses 3-lead SOT-23 package (TT suffix), with SCIO as bidirectional serial clock/data line, VCC as supply input, and VSS as ground reference. No NC pins are present in this variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 11AA080T-I/MS, the 11LC080T-I/MS provides higher VCC noise immunity above 2.5V but lacks sub-2.5V operation; versus 24LC08BT-I/MS, it reduces pin count by one but mandates UNI/O® protocol implementation instead of standard I²C drivers.

Availability

11LC080T-I/MS is available at Aetrix Electronics and suitable for smart sensor calibration storage, industrial PLC configuration memory, medical device usage logs, and automotive body control module settings requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 11LC080T-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 emphasis on embedded control and low-power solutions.

The 11LC080T-I/MS belongs to Microchip's UNI/O® Serial EEPROM family, designed specifically for space- and pin-constrained embedded systems needing reliable, low-voltage nonvolatile storage with minimal MCU interface overhead.

FAQ

What is the UNI/O® interface used by the 11LC080T-I/MS?

The 11LC080T-I/MS uses Microchip's patented UNI/O® bus, a single-wire, Manchester-encoded serial interface that combines clock and data into one SCIO signal. This eliminates separate clock lines and reduces MCU pin count. The 11LC080T-I/MS supports up to 100 kbps, with built-in re-synchronization to tolerate frequency drift and edge jitter - enabling robust communication even with low-cost microcontrollers lacking dedicated serial peripherals.

Does the 11LC080T-I/MS require external components for reliable operation?

No, the 11LC080T-I/MS operates stand-alone with only VCC, VSS, and SCIO connections. It includes Schmitt-trigger inputs for noise suppression, output slope control to prevent ground bounce, and internal power-on/off write protection. No external pull-ups, capacitors, or level shifters are required - simplifying design and reducing BOM cost compared to I²C or SPI EEPROMs.

How does write protection work on the 11LC080T-I/MS?

The 11LC080T-I/MS implements two-tier write protection: hardware-level block protection (BP0/BP1 bits in STATUS register) allows locking 0%, 25%, 50%, or 100% of memory; and software-level write enable latch (WEL bit) must be set via WREN command before any write. Both protections persist through power cycles, and the 11LC080T-I/MS automatically resets WEL on power-up or after successful write commands to prevent unintended modifications.

What is the maximum write speed and timing behavior of the 11LC080T-I/MS?

The 11LC080T-I/MS supports up to 100 kbps bit rate (10 µs bit period), with self-timed write cycles completing in ≤10 ms for byte or page writes. During writes, the WIP bit in the STATUS register goes high and remains asserted until programming finishes - allowing the host to poll for completion without fixed delays. The 16-byte page buffer enables efficient multi-byte writes without intermediate ACKs, improving throughput in burst-write scenarios.

Is the 11LC080T-I/MS compatible with automotive applications?

The 11LC080T-I/MS is rated for Industrial temperature range (-40°C to +85°C) and is not qualified to AEC-Q100 automotive standards. For automotive use, Microchip offers the 11LC080T-E/MS variant (E-temp, -40°C to +125°C). While the 11LC080T-I/MS may function in benign automotive environments, it lacks automotive qualification testing and is intended for industrial, medical, and consumer applications requiring industrial-grade reliability.