Microchip Technology 11LC020-I/P

Overview

11LC020-I/P from Microchip Technology Inc. is a 2 Kbit (256 × 8) serial EEPROM using the UNI/O® single I/O bus interface. It operates from 2.5V to 5.5V, draws 1 mA active current and 1 µA standby current (max.), and supports 100 kbps bit rate with Manchester-encoded SCIO communication. It is used in space-constrained embedded systems for nonvolatile parameter storage, such as calibration data in industrial sensors.

For engineers reviewing the 11LC020-I/P datasheet, 11LC020-I/P pinout, 11LC020-I/P application, or 11LC020-I/P equivalent, key selection considerations include its 3-lead SOT-23 package, I²C-alternative UNI/O® protocol, page-write buffer (16 bytes), STATUS register control, and industrial temperature range (–40°C to +85°C).

Technical Context

The 11LC020-I/P implements a Manchester-encoded, master-controlled UNI/O® bus with SCIO as the sole bidirectional signal line. Its internal architecture includes a 256 × 8-bit EEPROM array, 16-byte page write buffer, STATUS register (WIP/WEL/BP bits), and slope-controlled output driver to suppress ground bounce.

It features Schmitt-trigger inputs for noise immunity, self-timed write cycles (5–10 ms), block write protection (none/¼/½/all), and built-in power-on/off write protection. Timing relies on start-header synchronization and MAK/NoMAK acknowledge sequences - no external clock or address lines required.

Key Specifications

Pinout & Package

Package: 3-lead SOT-23 (TT suffix), with SCIO, VCC, and VSS terminals. Pin 1 = SCIO, Pin 2 = VCC, Pin 3 = VSS (top-down view per DS22067J-page 2).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 11AA020-I/P, the 11LC020-I/P provides tighter input threshold margins above 2.5V and automotive-grade qualification option; compared with 24LC02BT-I/OT, it reduces pin count and eliminates pull-up dependencies but requires UNI/O®-capable firmware stack.

Availability

11LC020-I/P is available at Aetrix Electronics and suitable for industrial sensor calibration, motor drive parameter storage, and medical device configuration requiring stable component supply across extended production lifecycles.

Supply support for 11LC020-I/P 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 emphasis on embedded control and reliability.

The 11LC020-I/P belongs to Microchip's UNI/O® serial EEPROM family, designed specifically for cost-sensitive, space-constrained applications needing minimal GPIO usage and robust nonvolatile storage in harsh environments.

FAQ

What is the UNI/O® interface used by the 11LC020-I/P?

The 11LC020-I/P uses Microchip's patented UNI/O® bus - a single-wire, Manchester-encoded serial interface where clock and data are combined on the SCIO pin. Unlike I²C or SPI, it requires no dedicated clock line or address pins, reducing MCU pin count and PCB routing complexity. The 11LC020-I/P acts as a slave, synchronizing to the master's start header and responding via MAK/NoMAK handshaking.

Does the 11LC020-I/P support write protection?

Yes, the 11LC020-I/P supports hardware-based block write protection via two nonvolatile BP0/BP1 bits in its STATUS register. These bits can be programmed using the WRSR command to protect none, 1/4, 1/2, or all of the memory array. Protection is enforced independently of software control - even if the write enable latch is set, protected blocks remain read-only until BP bits are cleared.

What is the maximum write speed and timing behavior of the 11LC020-I/P?

The 11LC020-I/P supports up to 100 kbps bit rate (equivalent to 100 kHz bus frequency), with typical write cycle time of 5 ms for byte writes and 10 ms for page writes. Write operations are self-timed - the WIP bit in the STATUS register must be polled to determine completion. No external wait states or timing delays are required beyond the specified TWC max values.

Can the 11LC020-I/P operate at 1.8V?

No, the 11LC020-I/P is specified for 2.5V to 5.5V operation only. For 1.8V compatibility, Microchip offers the pin-compatible 11AA020-I/P variant, which shares identical density, page size, UNI/O® protocol, and SOT-23-3 packaging but extends VCC down to 1.8V. Using 11LC020-I/P below 2.5V violates absolute maximum ratings and may cause unreliable communication or data corruption.

How does the 11LC020-I/P handle power loss during a write cycle?

The 11LC020-I/P includes built-in power-loss protection circuitry that monitors VCC and aborts write operations if supply voltage drops below safe programming thresholds. Combined with automatic erase-before-write and EEPROM cell architecture, this ensures data integrity - partial writes do not corrupt adjacent memory locations. Additionally, the write enable latch resets on power-up, preventing unintended writes after brown-out recovery.