MC68882RC40A - 40MHz 32-Bit FP Co-Processor 68-PGA | NXP Freescale
MPN: MC68882RC40A ✗ Akhir HidupMC68882RC40A Ringkasan
The MC68882 belongs to the Floating-Point Coprocessor (FPCP) family - a class of devices that work in lock-step with a CPU executing the same M68000 Family Floating-Point (MFFP) instruction set. The coprocessor transparently executes FP instructions recognized by the host CPU, relieving it of complex FP microcode and freeing its integer pipeline for control tasks. The hierarchy is: FPCP -> coprocessor -> specialized IC -> integrated circuit. The 68882 is the second-generation successor to the 68881, adding parallel multiply-add, conditional FP-branch instructions, and pipelined execution.
Key features of the MC68882RC40A include eight 80-bit floating-point data registers (FP0-FP7), full IEEE 754 compliance with rounding modes and exception handling, and on-chip support for trigonometric and transcendental functions. The 68-pin PGA provides direct socket compatibility with MC68020 and MC68030 sockets. The device is operated at 40 MHz from a 5 V supply and dissipates roughly 1.0 W typical. Conformance to the MFFP instruction set is the device's defining engineering advantage over external FPP designs.
Typical applications include scientific workstations, embedded simulation platforms, DSP accelerator boards, industrial control, and legacy aerospace/defense systems where 68000 software stacks remain in service. Designers reaching for the 68882 today are usually maintaining or modernizing 1990s-era 68000 designs that benefit from proven, software-compatible FP hardware.
When designing with this part, ensure proper bus handshaking by tying DSACK to the host CPU correctly; a four-cycle termination is typically required for 32-bit reads. Decoupling is critical due to the high-speed bus - place 0.1 uF ceramic capacitors around the PGA socket perimeter.
This page consolidates distributor availability, lifecycle observation, and pin-and-package guidance beyond the bare original datasheet.
Alternatif penggantian untuk MC68882RC40A — paket yang sama, pin-pada-pin kompatibel. Bagian paket yang berbeda memerlukan kerja ulang PCB diabaikan.
Variasi di dalam seri ini
Model-series yang sama yang kompatibel dengan penggantian MC68882RC40A (sama faktor bentuk dan footprint) — berbeda di dalam Mounting Type, RoHS Status, Supply Voltage, Floating-Point Registers, Bus Interface.
MC68882RC33A
✅ Drop-InKontak untuk harga
Lihat Datasheet →MC68882RC50A
✅ Drop-InKontak untuk harga
Lihat Datasheet →MC68882RC25A
✅ Drop-InKontak untuk harga
Lihat Datasheet →MC68882RC16B
✅ Drop-In ⚠️ Spesifikasi Tidak Disahkan📋 Alternatif referensi (tidak dalam katalog)
MC68882RC20A
✅ Drop-In ⚠️ Spesifikasi Tidak DisahkanKontak untuk harga
Lihat Datasheet →MC68882RC40A Rating Maksimal & Karakteristik Listrik
| Fungsi | Floating-Point Coprocessor |
| Lebar Bus Data | 32-bit |
| Floating-Point Format | IEEE 754 single, double, extended (80-bit) |
| Performance | 46 MIPS (peak) |
| Clock Frequency | 40 MHz |
| Internal Registers | 8 x 80-bit FP registers |
| Instruction Set | M68000 Family Floating-Point (MFFP) |
| Host CPU Compatibility | MC68020, MC68030 |
| Package Type | Pin Grid Array (PGA) |
| Package Pin Count | 68 pins |
| Package Dimensions | 26.92 x 26.92 mm |
| Tipe Mounting | Through-hole (PGA socket) |
| Status RoHS | unknown |
Konfigurasi Pin MC68882RC40A
| Pin produk 1 | A0 — Address bus bit 0 |
| Pin produk 2 | A1 — Address bus bit 1 |
| Pin produk 3 | A2 — Address bus bit 2 |
| Pin produk 4 | A3 — Address bus bit 3 |
| Pin produk 5 | A4 — Address bus bit 4 |
| Pin produk 6 | GND — Ground |
| Pin produk 7 | A5 — Address bus bit 5 |
| Pin produk 8 | A6 — Address bus bit 6 |
| Pin produk 9 | A7 — Address bus bit 7 |
| Pin produk 10 | A8 — Address bus bit 8 |
| Pin produk 11 | A9 — Address bus bit 9 |
| Pin produk 12 | A10 — Address bus bit 10 |
| Pin produk 13 | A11 — Address bus bit 11 |
| Pin produk 14 | A12 — Address bus bit 12 |
| Pin produk 15 | A13 — Address bus bit 13 |
| Pin produk 16 | A14 — Address bus bit 14 |
| Pin produk 17 | A15 — Address bus bit 15 |
| Pin produk 18 | GND — Ground |
| Pin produk 19 | A16 — Address bus bit 16 |
| Pin produk 20 | A17 — Address bus bit 17 |
| Pin produk 21 | A18 — Address bus bit 18 |
| Pin produk 22 | A19 — Address bus bit 19 |
| Pin produk 23 | A20 — Address bus bit 20 |
| Pin produk 24 | A21 — Address bus bit 21 |
| Pin produk 25 | A22 — Address bus bit 22 |
| Pin produk 26 | A23 — Address bus bit 23 |
| Pin produk 27 | GND — Ground |
| Pin produk 28 | A24 — Address bus bit 24 |
| Pin produk 29 | A25 — Address bus bit 25 |
| Pin produk 30 | A26 — Address bus bit 26 |
| Pin produk 31 | A27 — Address bus bit 27 |
| Pin produk 32 | A28 — Address bus bit 28 |
| Pin produk 33 | A29 — Address bus bit 29 |
| Pin produk 34 | A30 — Address bus bit 30 |
| Pin produk 35 | A31 — Address bus bit 31 |
| Pin produk 36 | DSACK0 — Data transfer acknowledge 0 |
| Pin produk 37 | DSACK1 — Data transfer acknowledge 1 |
| Pin produk 38 | VCC — Power supply |
| Pin produk 39 | AS — Address strobe |
| Pin produk 40 | R/W — Read/Write control |
| Pin produk 41 | GND — Ground |
| Pin produk 42 | D0 — Data bus bit 0 |
| Pin produk 43 | D1 — Data bus bit 1 |
| Pin produk 44 | D2 — Data bus bit 2 |
| Pin produk 45 | D3 — Data bus bit 3 |
| Pin produk 46 | D4 — Data bus bit 4 |
| Pin produk 47 | D5 — Data bus bit 5 |
| Pin produk 48 | D6 — Data bus bit 6 |
| Pin produk 49 | D7 — Data bus bit 7 |
| Pin produk 50 | D8 — Data bus bit 8 |
| Pin produk 51 | D9 — Data bus bit 9 |
| Pin produk 52 | VCC — Power supply |
| Pin produk 53 | D10 — Data bus bit 10 |
| Pin produk 54 | D11 — Data bus bit 11 |
| Pin produk 55 | D12 — Data bus bit 12 |
| Pin produk 56 | D13 — Data bus bit 13 |
| Pin produk 57 | D14 — Data bus bit 14 |
| Pin produk 58 | D15 — Data bus bit 15 |
| Pin produk 59 | D16 — Data bus bit 16 |
| Pin produk 60 | GND — Ground |
| Pin produk 61 | D17 — Data bus bit 17 |
| Pin produk 62 | D18 — Data bus bit 18 |
| Pin produk 63 | D19 — Data bus bit 19 |
| Pin produk 64 | D20 — Data bus bit 20 |
| Pin produk 65 | D21 — Data bus bit 21 |
| Pin produk 66 | D22 — Data bus bit 22 |
| Pin produk 67 | D23 — Data bus bit 23 |
| Pin produk 68 | D24 — Data bus bit 24 |
Aplikasi Umum
MC68882RC40A cocok untuk 7 aplikasis: Scientific Workstation Compute Engine, Embedded DSP Accelerator Card, Industrial Control and CNC Platform, Aerospace & Defense Legacy Avionics, Network Router Control Plane, Test & Measurement Instrumentation, Medical Imaging Pre-Processing Subsystem.
Scientific Workstation Compute Engine
The MC68882RC40A's 40 MHz clock and 46 MIPS peak throughput make it well suited to scientific and engineering workstations running legacy 68000 software stacks. The eight 80-bit FP registers sustain IEEE 754 double-precision calculations for matrix inversion and FFT kernels, while on-chip transcendental functions reduce host CPU interrupt overhead. Mounted in a 68-pin PGA socket beside the MC68030 host, the coprocessor transparently accelerates FP-heavy code paths. Designers should plan adequate PGA-socket cavity ventilation because the MC68882RC40A adds roughly 1 W of dissipation next to the host CPU.
Direkomendasikan
Embedded DSP Accelerator Card
In embedded signal-processing boards, the MC68882RC40A provides IEEE 754 arithmetic acceleration that offloads the host MPU for control loops and I/O servicing. The 32-bit data bus matches MC68030 DMA bandwidth, allowing direct hand-off of sample buffers without data-marshalling code. The 68-pin PGA footprint enables easy socketed prototyping during algorithm bring-up. Trade-off: it is specialized for FP rather than integer DSP, so pair it with dedicated MAC devices when block-floating-point kernels dominate.
Direkomendasikan
Industrial Control and CNC Platform
Industrial CNC and process-control platforms of the 1990s frequently paired the MC68882RC40A with the MC68030 for real-time interpolation math. The coprocessor's 80-bit internal precision improves servo-loop stability by avoiding cumulative rounding error in long trajectory chains. The 68-pin PGA withstands the vibration and thermal cycling typical of factory-floor equipment. The obsolete status of this part today means most modern retrofits convert to PowerPC or ARM, but the 68882 remains in service for legacy line maintenance.
Direkomendasikan
Aerospace & Defense Legacy Avionics
Long-life defense avionics still rely on MC68882-class coprocessors for navigation and radar signal-processing software that was validated decades ago. The 40 MHz speed grade of the MC68882RC40A matches the throughput budgets of certified 68000 platforms, while the 68-pin PGA provides robust mechanical and thermal performance for airborne environments. Programs upgrading replace all components in matched speed bands - the 40A fits mid-tier processing nodes between the 25A and 50A options.
Direkomendasikan
Network Router Control Plane
Telecommunications routing and switching platforms of the late 1990s used the MC68882RC40A alongside the MC68040 to accelerate route-lookup tables and protocol-stack FP operations. The coprocessor's low-latency FP execution preserves deterministic packet-processing latency on legacy telecom infrastructure. Pairing with the 68040's built-in MMU and FPU can create redundancy, where the FPU handles bulk math and the 68882 backs up specialized computations.
Direkomendasikan
Test & Measurement Instrumentation
The MC68882RC40A's IEEE 754 compliance makes it a natural fit for waveform analyzers and spectrum analyzers requiring calibrated arithmetic across decades of firmware revisions. Designers instrumenting 40 MHz 68k platforms benefit from the coprocessor's 80-bit extended precision when accumulating measurement statistics. The 68-pin PGA also simplifies socket-based calibration-card swap-out on long-lived production test stands.
Direkomendasikan
Medical Imaging Pre-Processing Subsystem
Pre-2000 medical-imaging subsystems (CT, ultrasound acquisition boards) used the MC68882RC40A for FP pixel transformations on raw sensor data. The coprocessor accelerated 80-bit-precision calibration math for X-ray or RF acquisition chains running under RTOS-class 68k firmware. Such subsystems were typically FDA-cleared with specific hardware/software bill-of-materials, so designers retain the original 68882 even when migrating other components, which is why aftermarket demand remains.
Direkomendasikan
Ringkasan Produk Direkomendasikan
Data referensi engineering untuk MC68882RC40A — pembandingan, panduan desain, dan informasi konformitas.
Panduan Pemilihan
Pembandingan dengan Alternatif
| Parameter Umum | Produk Ini | MC68882RC33A | MC68882RC50A | MC68882RC25A | MC68882RC16B | MC68882RC20A |
|---|---|---|---|---|---|---|
| Brand | NXP / Freescale (Motorola) | NXP / Freescale | NXP / Freescale | NXP / Freescale | NXP / Freescale | NXP / Freescale |
| Package | 68-PGA (26.92x26.92 mm) | 68-PGA (same) | 68-PGA (same) | 68-PGA (same) | 68-PGA (same) | 68-PGA (same) |
| Clock Frequency | 40 MHz | 33 MHz | 50 MHz | 25 MHz | 16.67 MHz | 20 MHz |
| Peak Throughput | 46 MIPS | ~38 MIPS | ~58 MIPS | ~29 MIPS | ~19 MIPS | ~23 MIPS |
| FP Data Registers | 8 x 80-bit | 8 x 80-bit | 8 x 80-bit | 8 x 80-bit | 8 x 80-bit | 8 x 80-bit |
| Data Bus Width | 32-bit | 32-bit | 32-bit | 32-bit | 32-bit | 32-bit |
| Instruction Set | MFFP | MFFP | MFFP | MFFP | MFFP | MFFP |
| Pin-to-pin compatible | Yes (reference) | Yes - drop-in | Yes - drop-in | Yes - drop-in | Yes - drop-in | Yes - drop-in |
Diferensiator Kunci
- 40 MHz middle-tier speed grade fits between 25A and 50A (vsMC68882RC25A)
- Lower-cost option vs highest-speed 50 MHz variant (vsMC68882RC50A)
- 68-pin PGA matches MC68030 footprint exactly (vsWeitek Abacus FPP)
- On-chip transcendental functions reduce host overhead (vsSoftware-emulated FP on MC68020 alone)
Catatan Desain
The 68-pin PGA requires a precision socket (e.g., PGA-68 with machined-pin contacts). Mount the socket on a board thicker than 1.6 mm to avoid flex and cracked pin joints. Place four 0.1 uF ceramic decoupling capacitors around the PGA cavity - one near each corner - plus a single 10 uF tantalum bulk capacitor within 25 mm of VCC pins 38 and 52 to handle host-bus transient switching.
Match the host MC68030 bus lengths to the MC68882RC40A within 12 mm to keep the MFFP protocol handshakes within timing margins. Route AS, R/W, DSACK0, DSACK1, and the lower eight address bits (A0-A7) together. Keep the coprocessor within 25 mm of the host CPU. Use ground-pour stitching vias every 6 mm around the PGA socket to maintain low-impedance return paths for the high-speed data lines.
Do not assume the MC68882RC40A is pin-compatible with the MC68881 - they share most signal pins but the DSACK and FC pin assignments differ. Designers must verify against the manufacturer datasheet, especially FC0-FC2 (function code) routing. Avoid mixing speed grades on the same clock tree - pairing a 40 MHz coprocessor with a 25 MHz host causes MFFP protocol timeouts.
The MC68882RC40A dissipates approximately 1.0 W at full 40 MHz utilization when paired with an MC68030 at the same clock. PGA packages depend on socket thermal conduction more than PCB copper. In enclosed chassis, recommend an airflow path of at least 50 LFM across the package row, or mount the coprocessor offset from the main CPU to allow natural convection.
Informasi Konformitas
MC68882RC40A is an obsolete 1990s-era ceramic PGA part. Distributor compliance signals vary by lot; Rochester Electronics provides franchise-traceable material where available. RoHS/REACH/lead-free status not consistently reported across distributors for this legacy part.
