MC68882CEI16A

Specialized ICS Overview

The MC68882CEI16A is a floating-point coprocessor implementing the IEEE 754-1985 standard for binary floating-point arithmetic. Designed as an upgrade to the MC68881, it offers over 1.5 times the performance while maintaining pin and software compatibility. The device features eight 80-bit general-purpose floating-point data registers supporting extended precision formats, a 67-bit arithmetic unit, and a 67-bit barrel shifter. It interfaces with Motorola M68000 family processors, specifically the MC68020 and MC68030, via a reduced-width coprocessor interface to increase throughput. The component is housed in a 68-pin PLCC package.

Specialized ICS Feature Summary

• Fully implements IEEE Standard 754-1985 for binary floating-point arithmetic
• Eight 80-bit floating-point data registers supporting full extended precision real data format
• 67-bit arithmetic unit and 67-bit barrel shifter for high-speed calculations
• Pin and software compatible with MC68881, offering >1.5x performance improvement

Specialized ICS Applications

• Coprocessor extension for MC68020 or MC68030 32-bit processor units
• Peripheral processor for MC68000, MC68008, or MC68010 systems
• Systems requiring high-performance floating-point arithmetic and transcendental functions

Specialized ICS Procurement Notes

Verify the specific suffix 'CEI16A' against official NXP/Freescale documentation to confirm voltage levels, temperature ranges, and packaging details, as suffixes often denote specific commercial or industrial variants. Ensure the source document explicitly links this exact part number to the MC68882 specifications provided. Cross-reference the manufacturer designation, as historical records may list Motorola or Freescale.

Specialized ICS Selection Notes

Select the MC68882 when upgrading from an MC68881 to gain higher performance without changing hardware layout or software code. It is suitable for applications requiring concurrent execution of floating-point instructions alongside the main CPU. Consider the asynchronous nature of the coprocessor, which allows it to run at different clock speeds than the main processor to balance performance and power consumption.

Specialized ICS Part Context

The MC68882 is part of the M68000 Family peripheral lineup, designed to extend the integer processing capabilities of Motorola's 32-bit microprocessors. It utilizes HCMOS technology for low power consumption and small die size. The device supports virtual memory operations through FSAVE and FRESTORE instructions and includes built-in self-test capabilities for manufacturing reliability.

Specialized ICS Replacement Considerations

The MC68881 is the direct predecessor, offering pin and software compatibility but lower performance. Other members of the M68000 family may require different coprocessors depending on bus width and architecture support. Verify that any replacement maintains the required IEEE 754 compliance and interface protocol.