Microchip Technology 11AA160-I/P

Overview

11AA160-I/P from Microchip Technology Inc. is a 16 Kbit (2,048 × 8) serial EEPROM with UNI/O® single I/O bus interface, operating from 1.8V to 5.5V, featuring 16-byte page write buffer, 1 µA max standby current (I-temp), and Schmitt-trigger SCIO input for noise immunity in space-constrained embedded systems.

For engineers reviewing the 11AA160-I/P datasheet, 11AA160-I/P pinout, 11AA160-I/P application, or 11AA160-I/P equivalent, this device serves as a low-pin-count, low-power nonvolatile memory solution for firmware storage, calibration data retention, and configuration parameter backup in industrial controllers, sensor nodes, and portable medical devices.

Technical Context

The 11AA160-I/P implements Manchester-encoded UNI/O® protocol over a single bidirectional SCIO line, eliminating need for separate clock and chip-select signals. Its internal timing recovery circuitry tolerates ±0.5% bus frequency drift per byte and ±0.06 UI edge jitter, enabling robust communication with low-cost GPIO-based masters.

It integrates a write-enable latch, STATUS register (WIP/WEL/BP bits), and hardware block protection (none/¼/½/all array), with self-timed 5–10 ms write cycles and automatic erase-before-write. Memory endurance is rated at 1,000,000 cycles with >200 years data retention at 85°C.

Key Specifications

Pinout & Package

11AA160-I/P is packaged in 8-lead PDIP (P package), with pin 1 = VSS (GND), pin 2 = NC, pin 3 = NC, pin 4 = SCIO (bidirectional serial clock/data), pin 5 = NC, pin 6 = NC, pin 7 = NC, pin 8 = VCC (supply voltage). No internal pull-ups; external pull-up required on SCIO for bus idle state.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 11LC160-I/P, the 11AA160-I/P enables true 1.8V operation in battery-sensitive applications, while versus 24AA16-I/P it delivers pin-count reduction and simplified firmware integration at the cost of interface standardization.

Availability

11AA160-I/P is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, smart energy metering, and automotive body control module applications requiring stable component supply across extended product lifecycles.

Supply support for 11AA160-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 leading provider of microcontroller, analog, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.

The 11AA160-I/P belongs to Microchip's UNI/O® serial EEPROM family, designed specifically to reduce pin count and system cost in space- and power-constrained embedded applications requiring reliable nonvolatile storage.

FAQ

What is the minimum supply voltage required for 11AA160-I/P operation?

The 11AA160-I/P operates down to 1.8V across its full industrial temperature range (–40°C to +85°C), enabling direct interfacing with 1.8V logic families and ultra-low-power microcontrollers without level-shifting circuitry. This specification is confirmed in the DC Characteristics table (DS22067J-page 3) under VCC = 1.8V to 2.5V test conditions.

How does the 11AA160-I/P handle write protection?

The 11AA160-I/P implements hardware block write protection via BP0/BP1 bits in its STATUS register, allowing users to protect 0%, 25%, 50%, or 100% of the memory array. Protection is set using the WRSR command and persists through power cycles. Built-in power-on/off data protection circuitry also prevents inadvertent writes during brown-out conditions.

Is the 11AA160-I/P pin-compatible with other devices in the 11XX family?

Yes - the 11AA160-I/P shares identical 8-lead PDIP pinout (P package) with all 11XX family members including 11AA010-I/P, 11AA080-I/P, and 11LC160-I/P. Pin 1 is VSS, pin 4 is SCIO, and pin 8 is VCC; NC pins are functionally unused and may be left unconnected without affecting operation.

What is the maximum bit rate supported by the 11AA160-I/P UNI/O® bus?

The 11AA160-I/P supports a maximum serial bus frequency of 100 kHz, corresponding to a 100 kbps bit rate. This is specified in the AC Characteristics table (DS22067J-page 4) under FBUS parameter, with timing validated across the full 1.8–5.5V VCC range and –40°C to +85°C temperature range.

Does the 11AA160-I/P require external components for basic operation?

Yes - a 10 kΩ pull-up resistor on the SCIO pin is mandatory to establish bus idle state and ensure proper Manchester decoding. Additionally, a 0.1 µF ceramic bypass capacitor must be placed between VCC and VSS within 5 mm of the device to stabilize supply during write cycles and suppress switching noise.