Microchip Technology 11AA020-I/P

Overview

11AA020-I/P from Microchip Technology is a 2 Kbit (256 × 8) serial EEPROM using the UNI/O® single I/O bus interface, operating from 1.8V to 5.5V with 1 µA max standby current and 1 mA typical active current. It features Manchester-encoded communication at up to 100 kbps, 16-byte page-write buffer, and integrated write protection for industrial applications requiring compact nonvolatile storage.

For engineers reviewing the 11AA020-I/P datasheet, 11AA020-I/P pinout, 11AA020-I/P application, or 11AA020-I/P equivalent, key selection criteria include its 1.8V minimum supply, SOT-23/TO-92/PDIP/SOIC package options, UNI/O® protocol compatibility, 1M endurance cycles, and block-level write protection configuration via STATUS register.

Technical Context

The 11AA020-I/P implements a Manchester-encoded, single-wire UNI/O® bus protocol where clock and data are embedded in the SCIO signal, eliminating need for separate clock lines. Its internal architecture includes a 16-byte page buffer, STATUS register with WIP/WEL/BP bits, and current-limited slope-controlled output driver to suppress ground bounce.

It supports dynamic re-synchronization during each MAK bit to tolerate ±0.50% frequency drift per byte and ±0.06 UI edge jitter. Standby mode is entered after NoMAK/SAK termination or explicit standby pulse (≥600 µs high), and idle mode activates on invalid address, command, or sync loss - both modes require SCIO low-to-high transition to resume.

Key Specifications

Pinout & Package

11AA020-I/P is packaged in 8-lead PDIP (P) and SOIC (SN), as well as 3-lead SOT-23 (TT) and TO-92 (TO). The PDIP/SOIC variant uses pins 1–8 with NC on pins 2, 3, 6, and 7; SOT-23 and TO-92 use 3-pin configurations with SCIO, VCC, and VSS assigned to specific leads per mechanical drawing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 11AA020-I/P, 11LC020-I/P trades 1.8V operation for broader voltage tolerance above 2.5V, while AT24C02C-SSHM-T offers I²C compatibility at the cost of additional signal routing and absence of UNI/O®-specific noise suppression features.

Availability

11AA020-I/P is available at Aetrix Electronics and suitable for motor control calibration storage, medical sensor configuration, and automotive body controller NVM requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 11AA020-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 company specializing in microcontrollers, analog devices, and memory products with emphasis on embedded control and reliability.

The 11AA020-I/P belongs to Microchip's 11XX UNI/O® Serial EEPROM family, designed specifically for space-constrained, low-pin-count applications needing robust nonvolatile storage with minimal MCU resource usage.

FAQ

What is the minimum supply voltage required for reliable operation of the 11AA020-I/P?

The 11AA020-I/P operates reliably down to 1.8V across its full industrial temperature range (–40°C to +85°C). Below 2.5V, DC characteristics such as input thresholds shift to VIL ≤ 0.2×VCC and VIH ≥ 0.7×VCC, and AC timing parameters remain valid per DS22067J-page 4 Table 1-2. This 1.8V capability enables direct integration with modern ultra-low-power MCUs without level-shifting.

How does the UNI/O® bus protocol differ from standard I²C or SPI interfaces in the 11AA020-I/P?

The 11AA020-I/P uses Microchip's patented UNI/O® protocol, which embeds clock and data into a single SCIO line via Manchester encoding - unlike I²C (two wires) or SPI (four wires). This eliminates dedicated clock lines and reduces MCU pin usage. Communication relies on master-generated timing, slave re-synchronization on every MAK bit, and strict header/acknowledge sequences defined in DS22067J sections 3.1–3.3.

Can the 11AA020-I/P be used in automotive applications requiring AEC-Q200 qualification?

No - the 11AA020-I/P is rated for Industrial temperature range (–40°C to +85°C) only and is not AEC-Q200 qualified. For automotive applications, Microchip offers the 11LC020-E/P variant, which shares identical density, page size, and UNI/O® functionality but is qualified for –40°C to +125°C and meets AEC-Q200 stress test requirements per DS22067J Device Selection Table.

What is the maximum write cycle time for a full 16-byte page in the 11AA020-I/P?

The maximum write cycle time (TWC) for a full 16-byte page in the 11AA020-I/P is 10 ms, as specified in DS22067J-page 4 Table 1-2 Parameter D13. This includes auto-erase and programming; the device asserts WIP=1 during this period and clears it upon completion. Byte writes take ≤5 ms, but page writes optimize throughput when sequential addresses are updated.

How is write protection configured on the 11AA020-I/P, and what blocks can be locked?

Write protection on the 11AA020-I/P is configured via the STATUS register's BP0 and BP1 bits, set using the WRSR command. These bits enable four protection modes: 00 = no protection, 01 = lower 1/4 (64 bytes), 10 = lower 1/2 (128 bytes), or 11 = full array (256 bytes) write-locked. Protection is nonvolatile and persists through power cycles, providing hardware-enforced security for critical configuration data.