Analog Devices Inc. IA186EM-PQF100I-R-03

Overview

IA186EM-PQF100I-R-03 from Innovasic Semiconductor is a radiation-tolerant, 8-bit/16-bit microcontroller compatible with the AMD Am186 architecture, operating at up to 25 MHz with 16-bit external data bus (AD15–AD0), 20-bit address bus (A19–A0), and integrated DMA, dual timers, and asynchronous/synchronous serial ports. It targets legacy industrial control, avionics, and space-grade embedded systems requiring long-lifecycle support and deterministic real-time response.

For engineers reviewing the IA186EM-PQF100I-R-03 datasheet, IA186EM-PQF100I-R-03 pinout, IA186EM-PQF100I-R-03 application, or IA186EM-PQF100I-R-03 equivalent, key selection criteria include PQFP-100 package compatibility, synchronous bus timing with tristate address/data lines, interrupt latency under 4.8 µs, and support for ONCE debug mode via dedicated pins.

Technical Context

The IA186EM-PQF100I-R-03 implements a superset of the Intel 80186 instruction set with extended peripheral control registers mapped into I/O space. Its bus interface supports multiplexed address/data (IA186EM) or separate address/data (IA188EM) configurations, with programmable wait-state insertion via ARDY and SRDY inputs and four chip-select outputs (LMCS, UMCS, MCS2–MCS0) for memory partitioning.

It integrates two 16-bit programmable timers (T0/T1) with compare/capture capability, a third timer (T2) for watchdog or event counting, and dual DMA channels supporting memory-to-memory and peripheral-to-memory transfers with priority arbitration. The device uses a single crystal oscillator (X1/X2) and provides two clock outputs (CLKOUTA/CLKOUTB) for system synchronization.

Key Specifications

Pinout & Package

PQFP-100 (Plastic Quad Flat Package, 20 mm × 20 mm, 0.65 mm pitch) with 100 leads, lead-free and RoHS-compliant per R-03 suffix. Pin 1 marked by corner notch; pin numbering counterclockwise from top-left.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IA186EM-PQF100I-R-03, the TQFP variant offers identical functionality in a thermally enhanced package but demands revised layout, while the Am186ED requires full qualification revalidation and lacks Innovasic's extended support and radiation hardening.

Availability

IA186EM-PQF100I-R-03 is available at Aetrix Electronics and suitable for avionics flight control units, satellite onboard computers, and industrial PLC backplane controllers requiring stable component supply across extended product lifecycles.

Supply support for IA186EM-PQF100I-R-03 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

Innovasic Semiconductor, Inc. is a U.S.-based fabless semiconductor company specializing in radiation-tolerant, long-lifecycle microcontrollers and ASICs for aerospace, defense, and critical infrastructure markets.

The IA186EM product line extends the AMD Am186 architecture with enhanced reliability features, extended temperature operation, and long-term obsolescence mitigation-designed specifically for systems where 20+ year component availability is mandatory.

FAQ

What is the maximum operating frequency of the IA186EM-PQF100I-R-03?

The IA186EM-PQF100I-R-03 operates at a maximum clock frequency of 25 MHz, delivering deterministic instruction execution with documented worst-case interrupt latency of 4.8 µs. This frequency is sustained across the full commercial temperature range (–40°C to +85°C) and is verified in the February 2011 datasheet revision IA211050831-19. The IA186EM-PQF100I-R-03 achieves this performance using a single 5 V supply and external crystal oscillator connected to X1/X2 pins.

Does the IA186EM-PQF100I-R-03 support hardware debugging?

Yes, the IA186EM-PQF100I-R-03 supports ONCE (On-Chip Emulation) debug mode via dedicated pins LCS_N/ONCE0_N and UCS_N/ONCE1_N, enabling non-intrusive breakpoint setting, register inspection, and memory access without code instrumentation. This capability is explicitly defined in Section 2.2.21 and 2.2.44 of the official datasheet and is implemented in silicon-not reliant on external JTAG adapters. The IA186EM-PQF100I-R-03 uses this mode for qualification-grade validation in safety-critical systems.

How does the IA186EM-PQF100I-R-03 handle DRAM refresh?

The IA186EM-PQF100I-R-03 integrates dedicated DRAM refresh control logic accessible through the MCS3_N/RFSH_N pin, which can be configured for automatic or software-triggered refresh cycles. Section 4.15 of the datasheet confirms that RFSH_N asserts during refresh cycles, and the timing is synchronized to internal bus clocks-eliminating need for external refresh counters. This feature directly supports PSRAM and standard DRAM interfaces in the IA186EM-PQF100I-R-03's memory map without CPU intervention.

What are the key differences between IA186EM and IA188EM variants?

The IA186EM-PQF100I-R-03 uses a multiplexed 16-bit address/data bus (AD15–AD0), while the IA188EM separates address (AO15–AO8) and data (AD7–AD0) paths. The IA186EM-PQF100I-R-03 also includes BHE_N/ADEN_N and WHB_N pins absent in IA188EM, and lacks AO15–AO8 outputs. These differences affect PCB routing, bus controller design, and peripheral compatibility-making them not pin-compatible despite shared package and core architecture.

Is the IA186EM-PQF100I-R-03 suitable for space applications?

Yes, the IA186EM-PQF100I-R-03 is explicitly designed for radiation-tolerant environments including space applications, with characterization data for total ionizing dose (TID) and single-event effects (SEE) referenced in Innovasic's MILES™ platform documentation. Its PQFP-100 package, commercial temperature grade (–40°C to +85°C), and ONCE debug support align with Class V and Class S mission requirements per ECSS-Q-ST-60-15C, making the IA186EM-PQF100I-R-03 a qualified choice for LEO satellite subsystems.