80C286

Overview

The Harris Corporation 80C286 is a static CMOS microprocessor, serving as the CMOS equivalent of the NMOS 80286. It features an 8-bit external data bus and a 16-bit address bus, packaged in a DIP40 format. The device supports clock frequencies ranging from DC up to 25 MHz, depending on the specific speed grade (e.g., 80C286-25). It operates within a temperature range of -55 °C to 125 °C for industrial/military variants and includes memory management capabilities mapping one gigabyte of virtual address space per task.

Feature Summary

• Static CMOS design optimized for low power consumption and high performance
• Integrated memory management supporting virtual memory and operating systems
• Four-level memory protection for program and data privacy
• Compatible with the 80287 numeric data co-processor

Applications

• Multiple user and multi-tasking systems
• Operating system development environments
• Applications requiring task isolation and program privacy
• High-performance embedded control systems

Procurement Notes

Verify the specific suffix indicating clock speed (e.g., -10, -12, -16, -20, -25) as it dictates maximum frequency and current consumption. Confirm package type availability, such as 68-pin PGA or PLCC, against project requirements. Check RoHS compliance status, as older CMOS batches may not meet modern environmental standards. Ensure supply chain authenticity due to the component's vintage manufacturing origin.

Selection Notes

Select the appropriate speed grade based on system timing requirements, noting that higher speeds increase maximum ICCOP current significantly. Choose the package style compatible with existing PCB footprints, ensuring thermal dissipation capabilities match the selected clock rate. Verify compatibility with the 80287 co-processor if floating-point operations are required. Consider the wide operating temperature range for harsh environment deployments.

Part Context

The 80C286 belongs to the Harris Intersil family of advanced microprocessors designed to replace NMOS counterparts with lower power CMOS versions. It maintains upward compatibility with the 8086/88 instruction set while offering enhanced 16-bit processing capabilities. This component bridges legacy architecture with modern real-address mode requirements, supporting both 80C286 Real Address Mode and PVAM.

Replacement Considerations

Public confirmed substitute part numbers include CS80C286-12, CS80C286-25, and CS80C286-20. These variants share identical functional architectures but differ in maximum clock frequency ratings and associated power consumption profiles.