Microchip Technology 11AA02E64-I/SN

Overview

11AA02E64-I/SN from Microchip Technology Inc. is a 2 Kbit serial EEPROM with preprogrammed, globally unique 64-bit EUI-64™ node address, single I/O UNI/O® interface, 256 × 8-bit organization, and industrial temperature range (−40°C to +85°C). It delivers low-power operation (1 µA standby, 1 mA active), Schmitt-trigger inputs, output slope control, and 100 kbps bit rate-used in embedded device identity and secure boot applications.

For engineers reviewing the 11AA02E64-I/SN datasheet, 11AA02E64-I/SN pinout, 11AA02E64-I/SN application, or 11AA02E64-I/SN equivalent, key selection criteria include EUI-64™ uniqueness, UNI/O® single-pin serial protocol compatibility, write-protection granularity (none/1/4/1/2/all), page-write buffer (16 bytes), and industrial-grade reliability (1M endurance, >200-year data retention).

Technical Context

The 11AA02E64-I/SN implements Manchester-encoded UNI/O® bus communication over a single SCIO line, eliminating need for separate clock lines. Its internal block diagram includes a current-limited slope-controlled SCIO driver, STATUS register with WIP/WEL/BP bits, and page latches supporting self-timed write cycles.

It operates across 1.8V–5.5V supply, supports dynamic polling of WIP/WEL bits via RDSR with MAK-repeated reads, and enforces strict bus synchronization using start-header-based clock recovery and re-synchronization on every MAK edge-tolerating ±0.50% frequency drift per byte and ±0.06 UI input jitter.

Key Specifications

Pinout & Package

11AA02E64-I/SN is packaged in 3-lead SOT-23 (SN suffix) with exposed pad not electrically connected. Pinout is minimal and unidirectional: SCIO serves as bidirectional serial clock/data I/O, VCC supplies 1.8–5.5V, and VSS is ground reference.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial EEPROM with unique node identity applications.

Compared with 11AA02E64-I/SN, 11AA02E48-I/SN offers identical functionality but limited to 48-bit addressing, while AT24C02C-SSHM-T trades built-in identity and single-pin simplicity for higher-speed I²C-but introduces host-side identity management risk and additional GPIO requirements.

Availability

11AA02E64-I/SN is available at Aetrix Electronics and suitable for industrial controller node identification, secure boot root key storage, network device identity assignment, and firmware parameter retention requiring stable component supply across multi-year production cycles.

Supply support for 11AA02E64-I/SN 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 solutions for industrial, automotive, and consumer applications.

The 11AA02E64-I/SN belongs to Microchip's UNI/O® serial EEPROM product line, designed specifically to provide factory-programmed, globally unique node identities for embedded networking and secure boot applications with minimal pin count and power budget.

FAQ

What is the factory-programmed identity format for the 11AA02E64-I/SN?

The 11AA02E64-I/SN contains a preprogrammed, globally unique 64-bit EUI-64™ node address permanently written at manufacture. This address complies with IEEE Std 802-2014 and is immutable-no field programming or modification is possible. It is used directly by host systems for MAC address derivation, IPv6 interface identifier generation, or secure device authentication. The 11AA02E64-I/SN does not support EUI-48™; that variant is the 11AA02E48-I/SN.

Does the 11AA02E64-I/SN require external pull-up resistors on the SCIO line?

No, the 11AA02E64-I/SN does not require external pull-up resistors on the SCIO line. Its UNI/O® interface uses an actively driven, current-limited, slope-controlled output stage that meets bus timing and signal integrity requirements without external components. The internal design includes Schmitt-trigger inputs and controlled edge rates to eliminate ground bounce and ensure reliable Manchester decoding-even under noisy conditions or long trace lengths.

How does write protection work on the 11AA02E64-I/SN?

Write protection on the 11AA02E64-I/SN is controlled by two nonvolatile BP0 and BP1 bits in the STATUS register, set via the WRSR instruction. These bits define four protection levels: none, upper 1/4 (addresses C0h–FFh), upper 1/2 (80h–FFh), or full array (00h–FFh). Protection is enforced at the hardware level during WRITE commands-no software check is needed. The 11AA02E64-I/SN retains protection state across power cycles and supports partial-array locking while leaving other regions writable.

Can the 11AA02E64-I/SN operate below 2.5V?

Yes, the 11AA02E64-I/SN operates down to 1.8V, but with specified performance limits: DC characteristics apply at TA = −20°C to +85°C for VCC = 1.8V–2.5V, and AC timing (e.g., 100 kbps max bit rate) remains valid. Standby current stays ≤1 µA, and active current is typically 1 mA at 2.5V. Operation below 1.8V is not characterized or guaranteed-the 11AA02E64-I/SN must be powered within its 1.8V–5.5V absolute rating to ensure functional reliability.

What is the maximum write cycle time for the 11AA02E64-I/SN?

The maximum write cycle time for the 11AA02E64-I/SN is 5 ms for byte or page writes (WRSR, WRITE), and 10 ms for ERAL or SETAL commands. This is a self-timed internal operation-the host must poll the WIP bit in the STATUS register (via RDSR) to detect completion. No external timing control or wait states are required. The 11AA02E64-I/SN guarantees this timing across its full industrial temperature range (−40°C to +85°C) and supply voltage range (1.8V–5.5V).