MC68882RC16A - 16 MHz 68882 FPU Co-Processor | NXP/Motorola
Référence : MC68882RC16A ✗ Fin de vie| Qté | Prix unitaire | Total |
|---|---|---|
| 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 Présentation
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.
Alternatives de remplacement direct pour MC68882RC16A — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec MC68882RC16A (même facteur de forme et même empreinte) — différant par Mounting Type, Floating-Point Standard, Supply Voltage, Process Technology, Package / Case.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
MC68882RC16
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MC68882RC20
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MC68882RC25
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MC68882RC33
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MC68881RC16
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
MC68882RC16A Valeurs maximales et caractéristiques électriques
| 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 |
| Tension d'alimentation | 5.0 V (single supply) |
| Boîtier | PGA-68 (26.92 x 26.92 mm) |
| Type de montage | 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 |
Guide de configuration des broches du MC68882RC16A pga-68 ceramic/cpga
Configuration des broches du MC68882RC16A (boîtier pga-68 ceramic/cpga). Ce circuit intégré numérique comprend des GPIO, des interfaces de communication (UART, SPI, I2C) et des broches d'alimentation. Consultez la fiche technique du fabricant pour les fonctions alternatives des broches et les options de configuration. Indispensable pour la conception de systèmes embarqués et la conception de circuits imprimés.
Aucune donnée de brochage détaillée disponible pour MC68882RC16A.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
MC68882RC16A convient pour 6 applications: 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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MC68882RC16A — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | 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 |
Principaux différenciateurs
- 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)
Notes de conception
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.
Informations de conformité
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.
