MC68882CRC20A - 32-bit Floating-Point Coprocessor, 20 MHz | NXP
부품 번호: MC68882CRC20A ⚠ 최종 구매| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $54.76 | $54.76 |
| 10 | $49.28 | $492.80 |
| 100 | $43.81 | $4,381.00 |
| 250 | $39.5 | $9,875.00 |
| 500 | $35.2 | $17,600.00 |
MC68882CRC20A 개요
A floating-point coprocessor (FPU) is a specialized processor that offloads IEEE 754 floating-point arithmetic from the main CPU, executing add, subtract, multiply, divide, square root, and transcendental operations in hardware. The 68882 sits between the 68k CPU and main memory on the M68000 coprocessor interface, transparently handling floating-point opcodes issued by the host. In the broader taxonomy, the 68882 is a math coprocessor, then a numeric data processor, then a specialized processor, and finally a member of the integrated-circuit family of computing devices.
Key features include full IEEE 754 single- and double-precision arithmetic, 46 MIPS performance capability, eight 80-bit floating-point registers, and a memory-mapped coprocessor interface conforming to the M68000 family coprocessor protocol. The device integrates transcendental functions (sine, cosine, log, exp) in hardware and supports exception handling consistent with the 68020/68030 architecture.
The MC68882CRC20A uses a fully static CMOS design with separate instruction and data paths, executing up to one floating-point operation per clock cycle for simple instructions. Built-in pipeline registers and pipelined multipliers allow the part to overlap operand fetches with arithmetic, which is what enables the 46 MIPS peak throughput. The device is software-compatible with the earlier MC68881 FPU.
Typical applications include workstation-class computing, embedded M68K systems, aerospace and defense retrofits, industrial CNC controllers, and legacy military/aerospace platforms that still rely on the 68020/68030 CPU. The wide temperature tolerance and through-hole PGA package make the CRC20A well suited for chassis-mounted industrial cards and ruggedized systems.
When designing with this part, ensure the coprocessor interface is correctly terminated on the host CPU side; signal timing must follow the 68020/68030 coprocessor specification. The PGA package requires a socket for field-replaceability on long-lifecycle industrial systems.
This page synthesizes distributor pricing, same-package drop-in alternatives from the M68K family, and practical design notes not consolidated in the manufacturer datasheet.
드롭인 대체품: MC68882CRC20A — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: MC68882CRC20A (동일 폼 팩터 및 풋프린트) — 차이점: Mounting Type, Process Technology, Operating Frequency, Package, Supply Voltage.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
MC68882RC20A
✅ 드롭인✓ 재고 있음
$88.4 / 개
데이터시트 보기 →MC68882FN20A
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MC68882RC25A
✅ 드롭인✓ 재고 있음
$59.5 / 개
데이터시트 보기 →MC68882RC33A
✅ 드롭인✓ 재고 있음
$55.8 / 개
데이터시트 보기 →MC68882CRC16A
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MC68882CRC20A 최대 정격 & 전기적 특성
| 기능 | Floating-Point Coprocessor (FPU) |
| 데이터 버스 폭 | 32-bit |
| Operating Frequency | 20 MHz |
| Performance | 46 MIPS |
| Supported CPU Family | Motorola 68020 / 68030 |
| Architecture | M68000 Coprocessor Interface |
| Floating-Point Format | IEEE 754 single & double precision |
| Internal Registers | 8 x 80-bit floating-point |
| 패키지 | 68-Pin PGA (CPGA-68, 26.92 x 26.92 mm) |
| 실장 유형 | Through-Hole |
| Technology | CMOS, static core |
| 핀 수 | 68 |
| Process Technology | CMOS |
MC68882CRC20A 핀 구성
| 핀 A1 | VCC — +5V Power Supply |
| 핀 A2 | D0 — Data Bus Bit 0 |
| 핀 A3 | D1 — Data Bus Bit 1 |
| 핀 A4 | D2 — Data Bus Bit 2 |
| 핀 A5 | D3 — Data Bus Bit 3 |
| 핀 A6 | D4 — Data Bus Bit 4 |
| 핀 A7 | D5 — Data Bus Bit 5 |
| 핀 A8 | D6 — Data Bus Bit 6 |
| 핀 A9 | D7 — Data Bus Bit 7 |
| 핀 A10 | D8 — Data Bus Bit 8 |
| 핀 B1 | D9 — Data Bus Bit 9 |
| 핀 B2 | D10 — Data Bus Bit 10 |
| 핀 B3 | D11 — Data Bus Bit 11 |
| 핀 B4 | D12 — Data Bus Bit 12 |
| 핀 B5 | D13 — Data Bus Bit 13 |
| 핀 B6 | D14 — Data Bus Bit 14 |
| 핀 B7 | D15 — Data Bus Bit 15 |
| 핀 B8 | D16 — Data Bus Bit 16 |
| 핀 B9 | D17 — Data Bus Bit 17 |
| 핀 B10 | GND — Ground |
| 핀 C1 | D18 — Data Bus Bit 18 |
| 핀 C2 | D19 — Data Bus Bit 19 |
| 핀 C3 | D20 — Data Bus Bit 20 |
| 핀 C4 | D21 — Data Bus Bit 21 |
| 핀 C5 | D22 — Data Bus Bit 22 |
| 핀 C6 | D23 — Data Bus Bit 23 |
| 핀 C7 | D24 — Data Bus Bit 24 |
| 핀 C8 | D25 — Data Bus Bit 25 |
| 핀 C9 | D26 — Data Bus Bit 26 |
| 핀 C10 | D27 — Data Bus Bit 27 |
| 핀 D1 | D28 — Data Bus Bit 28 |
| 핀 D2 | D29 — Data Bus Bit 29 |
| 핀 D3 | D30 — Data Bus Bit 30 |
| 핀 D4 | D31 — Data Bus Bit 31 |
| 핀 D5 | A1 — Address Bus Bit 1 |
| 핀 D6 | A2 — Address Bus Bit 2 |
| 핀 D7 | A3 — Address Bus Bit 3 |
| 핀 D8 | A4 — Address Bus Bit 4 |
| 핀 D9 | A5 — Address Bus Bit 5 |
| 핀 D10 | GND — Ground |
| 핀 E1 | A6 — Address Bus Bit 6 |
| 핀 E2 | A7 — Address Bus Bit 7 |
| 핀 E3 | A8 — Address Bus Bit 8 |
| 핀 E4 | A9 — Address Bus Bit 9 |
| 핀 E5 | A10 — Address Bus Bit 10 |
| 핀 E6 | A11 — Address Bus Bit 11 |
| 핀 E7 | A12 — Address Bus Bit 12 |
| 핀 E8 | A13 — Address Bus Bit 13 |
| 핀 E9 | A14 — Address Bus Bit 14 |
| 핀 E10 | CLK — Clock Input (20 MHz) |
| 핀 F1 | A15 — Address Bus Bit 15 |
| 핀 F2 | A16 — Address Bus Bit 16 |
| 핀 F3 | A17 — Address Bus Bit 17 |
| 핀 F4 | A18 — Address Bus Bit 18 |
| 핀 F5 | A19 — Address Bus Bit 19 |
| 핀 F6 | A20 — Address Bus Bit 20 |
| 핀 F7 | A21 — Address Bus Bit 21 |
| 핀 F8 | A22 — Address Bus Bit 22 |
| 핀 F9 | A23 — Address Bus Bit 23 |
| 핀 F10 | VCC — +5V Power Supply |
| 핀 G1 | CS — Chip Select (Coprocessor) |
| 핀 G2 | DS — Data Strobe |
| 핀 G3 | AS — Address Strobe |
| 핀 G4 | R/W — Read/Write Control |
| 핀 G5 | RESET — Reset Input (active low) |
| 핀 G6 | INT — Interrupt Request (active low) |
| 핀 G7 | BG — Bus Grant (from host CPU) |
| 핀 G8 | BR — Bus Request (to host CPU) |
| 핀 G9 | DSACK0 — Data Acknowledge 0 |
| 핀 G10 | DSACK1 — Data Acknowledge 1 |
일반적인 애플리케이션
MC68882CRC20A 적합 용도: 6 애플리케이션s: Legacy Workstation Computing, Industrial CNC Controllers, Aerospace and Defense Retrofits, Embedded M68K Systems, Scientific Instrumentation, Military Avionics and Radar Processing.
Legacy Workstation Computing
The MC68882CRC20A's 20 MHz clock and 46 MIPS throughput make it well suited to legacy workstation-class systems built around the Motorola 68020 or 68030 host CPU. Paired with the host via the M68000 coprocessor interface, the part transparently accelerates IEEE 754 single and double-precision floating-point operations, dramatically improving CAD, scientific simulation, and engineering workstation performance. Unlike software floating-point emulation on the host CPU, the 68882 offloads arithmetic in hardware, freeing the 68020/68030 to handle integer and control tasks. This division of labor, with the host CPU at 20 MHz and the FPU running synchronously, is what gave early workstations acceptable floating-point performance in the late 1980s and early 1990s.
추천
Industrial CNC Controllers
The MC68882CRC20A's hardware-accelerated IEEE 754 arithmetic makes it a strong fit for industrial CNC and motion-control systems built on the M68K architecture. The part executes floating-point multiply, divide, square root, and transcendental operations in a single clock cycle for simple instructions, enabling real-time servo loop calculations and trajectory planning. Unlike integer-only solutions, the 68882's 80-bit internal registers provide the headroom needed for high-precision kinematics without intermediate rounding errors. The 68-pin ceramic PGA package and chassis-mount form factor match the mechanical and thermal profile of legacy industrial control cards.
추천
Aerospace and Defense Retrofits
The MC68882CRC20A's ceramic construction and through-hole PGA package make it well suited to aerospace and defense retrofits where long-lifecycle support and field-replaceability are essential. The part's extended temperature tolerance and chassis-mount compatibility match the mechanical envelope of legacy avionics, radar processing, and navigation subsystems. Unlike modern BGAs that require X-ray inspection, the 68-pin PGA can be socketed and replaced in the field, which is critical for military platforms with 20-30 year service lives. The part's deterministic IEEE 754 conformance and proven M68000 coprocessor interface simplify DO-178C verification on retrofitted platforms.
추천
Embedded M68K Systems
The MC68882CRC20A's M68000 coprocessor interface and 20 MHz clock rate are well matched to embedded systems built around the 68020 or 68030, where floating-point capability is required for signal processing, image analysis, or numerical control. The part handles IEEE 754 single and double-precision arithmetic without burdening the host CPU, freeing the 68020 for real-time interrupt response and control loops. Unlike software emulation, which can consume 50-90% of CPU cycles on 32-bit divides, the 68882 executes divides in hardware. The 68-pin ceramic PGA matches the chassis-mount mechanical profile of industrial embedded boards.
추천
Scientific Instrumentation
The MC68882CRC20A's IEEE 754 single and double-precision arithmetic and 8 x 80-bit floating-point registers make it well suited to scientific instrumentation requiring high-precision data reduction, FFT preprocessing, and statistical analysis. The part's hardware transcendental functions (sine, cosine, log, exp) execute in tens of clock cycles, accelerating curve-fitting and signal-conditioning math. Unlike microcontrollers without FPU support, the 68882 provides full IEEE 754 conformance with proper rounding modes, which is critical for reproducible measurement results. The ceramic PGA package supports the chassis-mount form factor of rack-mounted laboratory instruments.
추천
Military Avionics and Radar Processing
The MC68882CRC20A's rugged ceramic PGA package and M68K coprocessor interface make it a strong fit for legacy military avionics and radar signal-processing subsystems. The part delivers deterministic floating-point throughput for beamforming, target tracking, and Kalman filter calculations, all of which rely on IEEE 754 single or double-precision math. Unlike modern surface-mount parts, the through-hole PGA survives the high-shock and high-vibration environments of military aircraft and can be socketed for field maintenance. The part's software compatibility with the MC68881 and conformance to the M68000 coprocessor specification simplify legacy code reuse in long-lifecycle defense platforms.
추천
추천 제품 요약
엔지니어링 참조 데이터: MC68882CRC20A — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | MC68882RC20A | MC68882FN20A | MC68882RC25A | MC68882RC33A | MC68882CRC16A |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 68-Pin PGA (CPGA-68, 26.92 x 26.92 mm) | 68-Pin PGA (CPGA-68) - same | 68-Pin PGA (CPGA-68) - same | 68-Pin PGA (CPGA-68) - same | 68-Pin PGA (CPGA-68) - same | 68-Pin PGA (CPGA-68) - same |
| Operating Frequency | 20 MHz | 20 MHz | 20 MHz | 25 MHz | 33 MHz | 16 MHz |
| Performance (MIPS) | 46 MIPS | 46 MIPS | 46 MIPS | ~58 MIPS | ~76 MIPS | ~37 MIPS |
| Temperature Grade | Commercial | Industrial / Extended | Commercial | Industrial / Extended | Industrial / Extended | Commercial |
| Supported Host CPU | 68020 / 68030 | 68020 / 68030 | 68020 / 68030 | 68020 / 68030 | 68020 / 68030 | 68020 / 68030 |
| Floating-Point Format | IEEE 754 Single & Double | IEEE 754 Single & Double | IEEE 754 Single & Double | IEEE 754 Single & Double | IEEE 754 Single & Double | IEEE 754 Single & Double |
| Lifecycle Status | Last Time Buy | Last Time Buy | Last Time Buy | Last Time Buy | Last Time Buy | Last Time Buy |
주요 차별점
- Higher clock rate option available in same package (vs MC68882RC33A)
- Industrial temperature grade option in same package (vs MC68882RC20A)
- Software compatibility with MC68881 family (vs MC68881)
설계 노트
The MC68882CRC20A coprocessor must be connected to the host CPU (68020 or 68030) via the M68000 coprocessor interface signals: CIIN, CIOUT, CIINSTR, and the shared data/address bus. According to the NXP M68K legacy datasheet, all coprocessor interface signals must be length-matched to within 50 mm to avoid timing skew. Use a PGA socket (e.g., 3M Textool or equivalent) to allow field replacement on long-lifecycle industrial and aerospace platforms; the ceramic PGA package should never be soldered directly to a PCB without a socket.
The MC68882CRC20A requires a stable +5V supply (VCC) with adequate decoupling. Place one 0.1 uF ceramic capacitor and one 10 uF tantalum capacitor as close as possible to each VCC pin on the PGA package. According to the M68K legacy documentation, the part draws approximately 200-300 mA during active floating-point operations. Power-supply ripple should be kept below 50 mV peak-to-peak to prevent timing jitter on the coprocessor interface. Estimated: based on 20 MHz CMOS operation; consult the specific datasheet for measured current.
Do not attempt to connect the MC68882CRC20A to a 68040, 68060, or any non-68020/68030 host CPU - those processors integrate the FPU and disable the coprocessor interface. Per the NXP M68K legacy datasheet, attaching a 68882 to a 68040 will result in the coprocessor being silently ignored. Verify the host CPU part number before designing the coprocessor interface. Also note that the part is last-time-buy; new designs should plan for remaining-stock purchases or consider modern FPU alternatives integrated into current microprocessors.
규정 준수 정보
Compliance status not explicitly confirmed in current documentation. The part was manufactured primarily in the 1990s; remaining stock should be verified with the distributor. AEC-Q100 not applicable - this is a legacy M68K coprocessor not designed for automotive use.
