Microchip Technology 11LC080T-E/TT

Overview

11LC080T-E/TT from Microchip Technology is an 8 Kbit (1,024 × 8) serial EEPROM with UNI/O® single-I/O bus interface, operating from 2.5V to 5.5V across -40°C to +125°C (Automotive E-temp), featuring 16-byte page write buffer, Schmitt-trigger SCIO input, and built-in block write protection for automotive body control modules and sensor calibration storage.

For engineers reviewing the 11LC080T-E/TT datasheet, 11LC080T-E/TT pinout, 11LC080T-E/TT application, or 11LC080T-E/TT equivalent, key selection considerations include its 3-lead SOT-23 (TT) package, UNI/O® Manchester-encoded timing compliance (10–100 kHz), standby current ≤1 µA at 125°C, and automotive-grade reliability (1M endurance, >200-year data retention).

Technical Context

The 11LC080T-E/TT implements a Manchester-encoded, single-wire UNI/O® bus protocol where clock and data are embedded in the SCIO signal, requiring master-controlled bit timing with ±5% frequency drift tolerance per command and ±0.06 UI edge jitter tolerance. It uses internal re-synchronization on every MAK bit to maintain alignment during variable-frequency operation.

Its architecture includes a status register with WIP and WEL flags, 16-byte page latches, high-voltage generation for EEPROM programming, and slope-controlled SCIO output to suppress ground bounce. Write operations are self-timed (max 10 ms), with automatic erase before write and hardware write-enable latch enforcement.

Key Specifications

Pinout & Package

11LC080T-E/TT is housed in a 3-lead SOT-23 package (TT suffix), with leads arranged as SCIO (pin 1), VCC (pin 2), and VSS (pin 3) - no NC pins. This compact, surface-mount package supports automated assembly and fits space-constrained automotive ECUs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 11LC080T-E/TT, the 11AA080T-I/TT offers lower-voltage operation but sacrifices automotive qualification, while the AT24C08D-SSHM-T provides I²C compatibility at the cost of increased pin count and loss of single-wire simplicity - making 11LC080T-E/TT optimal for new automotive designs prioritizing wiring reduction and E-temp robustness.

Availability

11LC080T-E/TT is available at Aetrix Electronics and suitable for automotive body electronics, engine management systems, and ADAS sensor calibration requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 11LC080T-E/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 manufacturer specializing in microcontrollers, analog devices, and memory products, with broad automotive qualification and AEC-Q100-compliant portfolio coverage.

The 11LC080T-E/TT belongs to Microchip's UNI/O® serial EEPROM family, designed specifically for space- and pin-constrained automotive subsystems requiring reliable, low-power nonvolatile storage with minimal interconnect overhead.

FAQ

What is the UNI/O® bus interface used by the 11LC080T-E/TT?

The 11LC080T-E/TT uses Microchip's patented UNI/O® single-wire bus, which embeds clock and data using Manchester encoding on the SCIO pin. This eliminates the need for a separate clock line, reducing PCB routing complexity and connector pin count. The 11LC080T-E/TT supports bit rates from 10 kHz to 100 kHz, with master-controlled timing and slave-side re-synchronization on every MAK bit to tolerate frequency drift and edge jitter.

Does the 11LC080T-E/TT require external components for basic operation?

Yes - the 11LC080T-E/TT requires a 0.1 µF ceramic decoupling capacitor between VCC and VSS, placed as close as possible to the device pins. No external pull-up or pull-down resistors are needed on SCIO due to its internally controlled slope and Schmitt-trigger input. The 11LC080T-E/TT does not require external timing components, as all write cycles are self-timed and internal clock recovery is handled automatically.

How is write protection implemented on the 11LC080T-E/TT?

Write protection on the 11LC080T-E/TT is implemented via two nonvolatile BP0 and BP1 bits in the STATUS register, configurable through the WRSR command. These bits enable four protection modes: no protection, top 1/4 (256 bytes), top 1/2 (512 bytes), or full array (1024 bytes). Protection is hardware-enforced - attempts to write to protected blocks are ignored, and the WIP bit remains clear. The 11LC080T-E/TT also includes power-on write protection and a write-enable latch that must be set via WREN before any write.

What is the maximum write cycle time for the 11LC080T-E/TT?

The maximum write cycle time for the 11LC080T-E/TT is 10 ms for byte or page writes, as specified in the AC characteristics table (parameter TWC). This includes internal auto-erase and programming time. During this period, the WIP bit in the STATUS register reads '1', and the device ignores all commands except RDSR. The 11LC080T-E/TT does not support early termination - the full 10 ms must elapse before issuing subsequent commands unless polling confirms WIP = 0.

Is the 11LC080T-E/TT compatible with other devices in the 11XX family?

Yes - the 11LC080T-E/TT shares identical UNI/O® protocol, instruction set, timing model, and pinout with other 11LCXXX and 11AAXXX devices in the same density class (e.g., 11LC080, 11AA080). It uses device address 0xA0 and supports the same 16-byte page buffer, STATUS register layout, and block protection scheme. However, voltage range (2.5–5.5V vs. 1.8–5.5V) and temperature grade (-40°C to +125°C vs. -40°C to +85°C) differ between LC and AA variants, so substitution requires validation of system-level VCC and thermal conditions.