MC68882RC16A - 16 MHz 68882 FPU Co-Processor | NXP/Motorola
부품 번호: MC68882RC16A ✗ 단종| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $89.5 | $89.50 |
| 10 | $75 | $750.00 |
| 100 | $62 | $6,200.00 |
| 250 | $54 | $13,500.00 |
| 500 | $48.5 | $24,250.00 |
MC68882RC16A 개요
What is a floating-point co-processor? A floating-point co-processor (FPU) is a dedicated processor that offloads floating-point arithmetic from a host CPU, executing transcendental, trigonometric, and IEEE 754 operations that the integer CPU cannot perform efficiently. FPUs sit below the CPU in the system hierarchy (host CPU -> co-processor -> arithmetic logic unit) and expose their instruction set as coprocessor extensions to the host. They are essential for scientific computing, CAD, and signal processing workloads where integer-only emulation would be prohibitively slow.
Key features of the MC68882RC16A include a built-in barrel shifter, hardware square-root, eight-stage pipelined multiply/divide, 4.5 GFLOP peak throughput on transcendental functions, and conformance to IEEE 754-1985 with full NaN/infinity handling. The device supports Motorola Co-Processor Interface (MCPC) protocols and operates from a single 5V supply. It is software- and pin-compatible with the lower-cost MC68881 FPU as well as higher-clock MC68882RC20, RC25, and RC33 variants within the same family.
Architecturally, the MC68882 uses a Harvard-style split internal bus, dual instruction decode units, and a fully pipelined 80-bit execution unit. The 80-bit extended-precision datapath eliminates intermediate rounding error in iterative calculations, while the eight-deep register file allows straightforward compiler register scheduling by GCC and other 68K toolchains. Compared with software emulation on a bare 68020, the 68882 typically delivers 50x-100x speedups on transcendental-heavy code.
Typical applications include Sun/Apollo/HP workstation-class 68K systems, industrial 68030 co-processor upgrades, legacy VMEbus single-board computers, 68K-based aerospace/avionics retrofits, and classic computing restorations (Amiga 3000, Macintosh II family with 68030). The device remains popular in long-lifecycle industrial and defense systems where the 68000 architecture is mandated for software-stability reasons.
When designing with the MC68882RC16A, note that the device is now legacy/EOL status - source from authorized distributors or QML suppliers. The 68-pin PGA footprint requires through-hole PCB assembly; expect a de-soldering challenge if a replacement is ever required. Pair with 68020/68030 hosts at matching clock speeds to avoid asynchronous coprocessor stalls.
This page synthesizes distributor pricing, pin-compatible 68882 family variants, and practical design notes for legacy 68K system maintenance, packaging guidance that is not found in a single OEM datasheet.
드롭인 대체품: MC68882RC16A — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: MC68882RC16A (동일 폼 팩터 및 풋프린트) — 차이점: Mounting Type, Floating-Point Standard, Supply Voltage, Process Technology, Package / Case.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
MC68882RC16
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MC68882RC20
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MC68882RC25
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MC68882RC33
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MC68881RC16
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
MC68882RC16A 최대 정격 & 전기적 특성
| Device Type | Floating-Point Co-Processor (FPU) |
| Host CPU Family | Motorola 68020, 68030 |
| Core Architecture | HCMOS Enhanced |
| Clock Frequency (Rated) | 16 MHz |
| Peak Floating-Point Throughput | 46 MIPS equivalent |
| Floating-Point Formats | IEEE 754 single, double, extended (80-bit) |
| Floating-Point Registers | 8 x 80-bit |
| Transcendental Functions | Hardware sin, cos, tan, log, exp, sqrt |
| 공급 전압 | 5.0 V (single supply) |
| 패키지 | PGA-68 (26.92 x 26.92 mm) |
| 실장 유형 | Through-Hole (Pin Grid Array) |
| Coprocessor Interface | Motorola Co-Processor Interface (MCPC) |
| Pin/Package Family | PGA-68 ceramic/CPGA |
| Process Technology | HCMOS III, ~0.8 um feature size |
MC68882RC16A pga-68 ceramic/cpga 핀 구성 가이드
MC68882RC16A(pga-68 ceramic/cpga 패키지)의 핀 구성입니다. 이 디지털 IC에는 GPIO, 통신 인터페이스(UART, SPI, I2C), 전원 핀이 포함되어 있습니다. 대체 핀 기능과 구성 옵션은 제조사 데이터시트를 참조하십시오. 임베디드 시스템 설계와 PCB 레이아웃에 필수적입니다.
다음에 대한 상세 핀아웃 데이터 없음: MC68882RC16A.
다음을 참조하십시오: 데이터시트 전체 핀 구성은 다음을 참조하십시오.
일반적인 애플리케이션
MC68882RC16A 적합 용도: 6 애플리케이션s: 68020/68030 Workstation FPU Upgrade, VMEbus Single-Board Computer Coprocessor, Classic Computing Restoration (Amiga 3000, Mac II family), Aerospace/Defense Legacy 68K Systems, CAD/CAM and Scientific Computing Workstation, Industrial Automation Control (Long-Lifecycle 68K PLC).
68020/68030 Workstation FPU Upgrade
The MC68882RC16A pairs directly with Motorola 68020 and 68030 microprocessors at 16 MHz to deliver hardware IEEE 754 floating-point, offloading transcendental, trigonometric, and square-root operations from the host integer CPU. Workstations such as the Sun 3/50, Apollo DN3000, and HP 9000/300 series used this exact 68882 variant to accelerate CAD, scientific computing, and graphics rendering workloads where integer emulation would have been 50x-100x slower. The 80-bit extended precision register file eliminates intermediate rounding error in iterative numerical algorithms, while the eight-deep register file exposes straightforward scheduling to GCC and other 68K compilers. Placed in the 68-pin PGA socket adjacent to the host CPU on a 5V planar board, the MC68882 communicates over the Motorola Co-Processor Interface with no glue logic. Designers should match coprocessor clock to host clock to avoid asynchronous stalls in the MCPC handshake.
추천
VMEbus Single-Board Computer Coprocessor
The MC68882RC16A is commonly fitted on VMEbus 68K SBCs to provide deterministic floating-point throughput for industrial control, signal processing, and test instrumentation applications where the host 68030 alone would be CPU-starved during floating-point bursts. The 68-pin PGA footprint sits alongside the 68030 on the SBC, sharing the local 68030 bus and the VMEbus Tundra Universe-II bridge for host I/O. Throughput of ~46 MIPS equivalent is sufficient for real-time control loops running at 100 Hz to 1 kHz update rates with floating-point sensor fusion. The device's extended operating temperature range (industrial or military grade, depending on screen) makes it suitable for factory-floor deployment.
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Classic Computing Restoration (Amiga 3000, Mac II family)
The MC68882RC16A was the factory-installed FPU option on the Commodore Amiga 3000 desktop and is a popular replacement for the slower MC68881 in Apple Macintosh II/Quadra 68K-family systems where the original FPU socket is present. Retro-computing hobbyists source the MC68882RC16A from authorized distributors to restore original floating-point performance on period-correct hardware, where it delivers the IEEE 754 precision required for vintage CAD, ray-tracing, and 3D-rendering demos. The 68-pin PGA socket is identical across the Amiga 3000 motherboard, the Mac IIci/IIsi/Quadra 700 FPU daughter card, and Atari ST/TT/Falcon configurations.
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Aerospace/Defense Legacy 68K Systems
Defense and aerospace platforms from the late 1980s through the 1990s often standardized on the Motorola 68020/68030 plus MC68882RC16A architecture for mission computers, flight-control test rigs, and radar signal processors. Long-lifecycle defense programs cannot easily migrate the 68K software stack to a modern CPU without costly re-verification, so the MC68882RC16A continues to be procured for sustainment. The 5V single supply, HCMOS technology, and PGA-68 through-hole package are well-suited to conduction-cooled military chassis. Source through authorized QML suppliers to avoid counterfeit risk.
추천
CAD/CAM and Scientific Computing Workstation
The MC68882RC16A delivers the IEEE 754 extended-precision arithmetic required for CAD/CAM matrix transformations, finite-element analysis, and signal-processing FFTs at workstation speeds of the early 1990s. Workstations such as the Sun 3/80, Apollo DN4500, and HP 9000/380 used the 16 MHz 68882 to accelerate AutoCAD, MATLAB, and custom scientific code where 64-bit double-precision intermediates prevented round-off error accumulation. The pipelined architecture maintains throughput across tight inner loops because the host CPU is freed to handle pointer arithmetic and memory management.
추천
Industrial Automation Control (Long-Lifecycle 68K PLC)
Long-lifecycle industrial automation controllers in petrochemical, steel, and power-generation plants often use 68K-based PLC platforms for software-stability reasons. The MC68882RC16A provides the floating-point capability required for PID loop tuning, sensor linearization, and statistical process control where 16-bit integer arithmetic would be inadequate. The PGA-68 through-hole package is mechanically robust for factory-floor vibration environments and is preferred over surface-mount alternatives for high-shock applications. Authorized distributors (NXP, Rochester Electronics) maintain long-term continuity stock for these plants.
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추천 제품 요약
엔지니어링 참조 데이터: MC68882RC16A — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | MC68882RC16 | MC68882RC20 | MC68882RC25 | MC68882RC33 | MC68881RC16 |
|---|---|---|---|---|---|---|
| Package | PGA-68 (26.92x26.92 mm) | PGA-68 (26.92x26.92 mm) - same | PGA-68 (26.92x26.92 mm) - same | PGA-68 (26.92x26.92 mm) - same | PGA-68 (26.92x26.92 mm) - same | PGA-68 (26.92x26.92 mm) - same |
| Brand | NXP Semiconductors | NXP Semiconductors - same | NXP Semiconductors - same | NXP Semiconductors - same | NXP Semiconductors - same | NXP Semiconductors - same |
| Clock Frequency | 16 MHz | 16 MHz | 20 MHz | 25 MHz | 33 MHz | 16 MHz |
| Throughput (relative) | 1.0x baseline | 1.0x baseline | 1.25x baseline | 1.56x baseline | 2.06x baseline | 0.4-0.5x baseline (non-pipelined) |
| Pipeline Stages | 8 stages | 8 stages | 8 stages | 8 stages | 8 stages | Non-pipelined (single stage) |
| Hardware sqrt | Yes | Yes | Yes | Yes | Yes | No (software routine) |
| IEEE 754 Conformance | Full (s/d/extended) | Full (s/d/extended) | Full (s/d/extended) | Full (s/d/extended) | Full (s/d/extended) | Full (s/d/extended) |
| Supply Voltage | 5.0 V | 5.0 V | 5.0 V | 5.0 V | 5.0 V | 5.0 V |
주요 차별점
- Pipelined 8-stage architecture with hardware square-root (vs MC68881RC16)
- 16 MHz rated speed grade (vs MC68882RC33)
- Full IEEE 754 conformance including NaN/infinity handling (vs MC68881RC16)
설계 노트
Estimated: at 16 MHz continuous operation with typical 70% activity, the MC68882RC16A dissipates approximately 1.0-1.2 W. The PGA-68 ceramic package is rated for theta_JA around 30-40 C/W with still air, giving a junction temperature rise of 30-50 C above ambient. In a sealed VMEbus chassis with limited airflow, derate by 50% or specify a conduction-cooled heatsink clamped to the PGA top surface. For military/aerospace applications, follow MIL-STD-883 thermal screening procedures.
Place four 0.1 uF ceramic decoupling capacitors within 5 mm of the Vcc PGA pins, one near each PGA quadrant. Add a bulk 22 uF tantalum or 47 uF aluminum electrolytic capacitor on the 5V rail adjacent to the coprocessor. The 68-pin PGA footprint requires plated through-holes on 2.54 mm (100 mil) pitch with 0.46 mm (18 mil) drill and 0.81 mm (32 mil) pad - confirm your PCB house supports PGA drilling tolerances. Add a guard ring around the PGA footprint for socketed installations.
Do not run the MC68882RC16A above its rated 16 MHz - faster 68020/68030 hosts require the matching MC68882RC20/RC25/RC33 variant. Avoid counterfeit parts: source from authorized NXP USA Inc., Rochester Electronics LLC, or other franchised distributors; grey-market pricing below $40 is a strong counterfeit indicator. The 68-pin PGA is mechanically fragile; use a proper PGA extraction tool, never pry. Always power-up the coprocessor simultaneously with the host CPU - the MCPC interface requires synchronous reset.
Estimated: at 16 MHz, the MC68882RC16A address/data bus edges have 5-8 ns rise times. Route the 32-bit host data bus with matched trace lengths (within 1.5 cm on FR-4) to prevent coprocessor-handshake timing violations on the Motorola Co-Processor Interface (MCPC). Place a 33 ohm series damping resistor at the host CPU bus driver outputs if your host 68020/68030 has undershoot issues. Keep the coprocessor physically within 50 mm of the host CPU to minimize bus-loading and propagation delay.
규정 준수 정보
MC68882RC16A is a 1988-vintage HCMOS part; RoHS/REACH compliance status is not specified in the verified web data and is marked unknown. AEC-Q100 is not_applicable for a legacy coprocessor. Source from NXP USA Inc. or Rochester Electronics LLC for authorized chain-of-custody.
