MC68SECCFU20B1-FR - 32-bit M68000 Microprocessor, 20 MHz | Freescale
부품 번호: MC68SECCFU20B1-FR ✗ 단종| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $14.0155 | $14.02 |
| 10 | $12.5 | $125.00 |
| 100 | $11.2 | $1,120.00 |
| 500 | $10.1 | $5,050.00 |
| 1,000 | $9.4 | $9,400.00 |
MC68SECCFU20B1-FR 개요
A microprocessor (MPU) is the central processing unit of an embedded computer system, integrating the arithmetic logic unit, control unit, registers, and bus interfaces on a single IC. The MC68SECCFU20B1-FR sits inside the broader taxonomy as microprocessor -> 32-bit MPU -> CISC processor (Complex Instruction Set Computer) -> M680x0 family -> embedded processor. The -SEC suffix traditionally denotes a screened or specified-environment variant, indicating hardened construction for demanding thermal and reliability profiles, while the -FR suffix indicates the supplied packaging format.
Key features include a 32-bit internal and external data path, 32-bit linear address space (4 GB), 20 MHz maximum clock, separate 32-bit instruction and data caches (in line with the 68020 Harvard-style architecture), and a multiply/divide unit supporting 32x32->64 and 64/32->32 operations in a small number of cycles. The CQFP (windowed/ceramic) package provides hermetic sealing and is targeted at defense and aerospace embedded systems where plastic packages are not acceptable.
The architecture is a true 32-bit CISC design with eight general-purpose 32-bit data registers and eight 32-bit address registers, an orthogonal instruction set, and a barrel shifter. The 68020 was Freescale/Motorola's first full 32-bit 680x0 MPU, adding instruction pipelining, virtual memory support via an MMU (68851 companion), and dynamic bus sizing for 8/16/32-bit peripherals on the same memory bus.
Typical applications include military/aerospace embedded controllers, industrial automation PLCs, high-reliability medical instrumentation, avionics mission computers, and legacy VMEbus systems. The CQFP package and SEC screening profile make it a drop-in for designs originally specified to MIL-STD-883 or similar reliability programs.
When designing with this part, pay particular attention to the CQFP socket or solder process because ceramic flat packs are not generally compatible with standard reflow profiles used for plastic QFP devices. Use a hermetic-compatible thermal profile and inspect solder joints per IPC-A-610 Class 3 if the application grade demands it.
This page synthesizes distributor pricing, lifecycle signals (the part is listed as Obsolete / Last Time Buy at Freescale and is now sourced through authorized aftermarket distributors), drop-in alternates from the M68020 family, and practical design notes not aggregated on any single manufacturer page.
드롭인 대체품: MC68SECCFU20B1-FR — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: MC68SECCFU20B1-FR (동일 폼 팩터 및 풋프린트) — 차이점: Mounting Type, On-chip Cache, RoHS Status, Supply Voltage.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
MC68SECCFU20B1
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MC68020FE20E
✅ 드롭인✓ 재고 있음
$32.97 / 개
데이터시트 보기 →MC68SECCFU20B1-FR 최대 정격 & 전기적 특성
| Core Processor | MC68020 (M680x0 family) |
| Number of Cores / Bus Width | 1 Core / 32-Bit |
| 최대 클록 주파수 | 20 MHz |
| 데이터 버스 폭 | 32-Bit |
| Address Bus Width | 32-Bit |
| Package Type | CQFP (Ceramic Quad Flat Pack) |
| 실장 유형 | Surface Mount (lead finish -FR per datasheet) |
| Instruction Set Architecture | CISC, 32-bit, orthogonal |
| On-chip Cache | Instruction cache + Data cache (256 bytes each per 68020 architecture) |
| Internal Registers | 8 x 32-bit data registers, 8 x 32-bit address registers |
| Coprocessor Interface | Yes (68851 PMMU, 68881/68882 FPU) |
| Memory Management | External 68851 PMMU support |
| 공급 전압 | 5 V (typical for 68020 family) |
| RoHS 상태 | Unknown - likely non-RoHS due to CQFP hermetic construction |
| Screening / Grade | -SEC suffix (extended environmental / specified-environment) |
MC68SECCFU20B1-FR cqfp (ceramic quad flat pack) 핀 구성 가이드
MC68SECCFU20B1-FR(cqfp (ceramic quad flat pack) 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: MC68SECCFU20B1-FR.
다음을 참조하십시오: 데이터시트 전체 핀 구성은 다음을 참조하십시오.
일반적인 애플리케이션
MC68SECCFU20B1-FR 적합 용도: 7 애플리케이션s: Military Avionics Mission Computer, VMEbus Industrial Controller, Military Sonar / Signal Processing Subsystem, Aerospace Ground-Support Test Equipment, Space-grade Payload Embedded Controller, Medical Instrumentation with Long Lifecycle, Embedded Trainer and Simulator Back-End.
Military Avionics Mission Computer
The MC68SECCFU20B1-FR is widely deployed in rugged military avionics mission computers where a 32-bit 68020 instruction set, hermetic CQFP package, and -SEC environmental screening keep existing flight-qualified boards in service. Its 20 MHz throughput, 32-bit linear 4 GB address space, and external MC68851 PMMU support virtual-memory mission code, while dynamic bus sizing lets 8/16/32-bit MIL-STD-1553 and ARINC peripherals share the same memory bus. The -FR carrier/finish option signals compliance with the assembly house's hermetic lead-finish requirements, eliminating re-screening of the OEM board.
추천
VMEbus Industrial Controller
Legacy VMEbus-based industrial controllers in factory-automation cells often use the MC68SECCFU20B1-FR as the master CPU because its 32-bit data bus and dynamic bus sizing match the 68020-family VME reference design from the late 1980s. The 20 MHz clock delivers deterministic real-time behavior needed for PLCs and motion controllers, while the coprocessor interface permits an external 68881/68882 FPU for closed-loop servo math. Drop-in compatibility with other -20 grade 68020 CQFP variants lets integrators re-use the existing PCB layout during lifecycle extension programs.
추천
Military Sonar / Signal Processing Subsystem
Submarine and surface-ship sonar subsystems built around the M680x0 family often retain MC68SECCFU20B1-FR units because the 68020's orthogonal 32-bit instruction set accelerates beamforming DSP code that porting to a new CPU would invalidate. The -SEC screening profile and CQFP ceramic package meet the MIL-STD-883 reliability and outgassing budgets that disqualify plastic-packaged 68020 variants in these programs. Designers hook the 68020 to external dual-port memory for shared data acquisition, with the dynamic bus sizing byte-ordering hardware keeping 8-bit ADC ASICs compatible.
추천
Aerospace Ground-Support Test Equipment
Test benches that stimulate or emulate aircraft subsystems are commonly built around MC68SECCFU20B1-FR-based single-board computers because the -FR finish and -SEC screening validate same-hermeticity criteria as the unit under test. Running the OEM flight code unchanged on 20 MHz 68020 silicon saves re-validation cost - the binary compatibility of 68020 across grades and packages is well-documented in Freescale's M680x0 reference manual. External dual-ported SRAM and a 68881 FPU provide real-time MIL-STD-1553 monitoring throughput.
추천
Space-grade Payload Embedded Controller
Small-satellite payload controllers with a heritage 680x0 codebase often qualify the MC68SECCFU20B1-FR-CQFP variant because its hermetic ceramic package survives outgassing and thermal cycling profiles that plastic QFP packages cannot. The 20 MHz instruction rate, 32-bit memory addressing, and external PMMU support virtual-memory task separation for housekeeping, payload telemetry, and ADCS code. The -SEC screening profile aligns with the reliability expectations of long-life satellite programs.
추천
Medical Instrumentation with Long Lifecycle
Long-life medical instrumentation such as radio-therapy control systems and patient-monitoring head-ends that hold FDA 510(k) clearances sometimes retain MC68SECCFU20B1-FR CPUs to avoid re-filing; the FDA path requires demonstrating substantial equivalence, which is much easier when the hardware and firmware remain identical. The 68020's deterministic interrupt response and the external 68882 FPU deliver the real-time numeric throughput required for dose calculation. Designers re-use the existing CQFP footprint and replace only failed units with -SEC-screened 68020 stock.
추천
Embedded Trainer and Simulator Back-End
Full-motion flight simulators and crew trainers frequently embed MC68SECCFU20B1-FR-based SBCs to host legacy instructor-station code that is too costly to revalidate. The 20 MHz 68020 delivers the worst-case interrupt latency needed for part-task trainer hand-offs, while the 32-bit address range hosts large crew-software databases in DRAM without bank-switching. -FR hermetic CQFP matches the chassis thermal expectations for back-room trainer electronics cooled by conduction-only paths.
추천
추천 제품 요약
엔지니어링 참조 데이터: MC68SECCFU20B1-FR — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | MC68SECCFU20B1 | MC68020FE20E |
|---|---|---|---|
| Brand | Freescale Semiconductor | Freescale Semiconductor | Freescale Semiconductor |
| Package | CQFP (Ceramic Quad Flat Pack, 132-pin family) | CQFP (Ceramic Quad Flat Pack, 132-pin family) - same | CQFP (Ceramic Quad Flat Pack, -FE outline) - same family |
| Core Processor | MC68020 (M680x0) | MC68020 | MC68020 |
| Maximum Clock Frequency | 20 MHz | 20 MHz | 20 MHz |
| Number of Cores / Bus Width | 1 Core / 32-Bit | 1 Core / 32-Bit | 1 Core / 32-Bit |
| Lifecycle Status | Obsolete | Obsolete | Obsolete |
| Packaging / Carrier | Bulk (-FR lead-finish / carrier) | Bulk (base lead-finish) | Tray (-FE) |
| Screening Grade | -SEC specified-environment | -SEC specified-environment | -FE (commercial-grade CE outline) |
| Architecture Family | M680x0 32-bit CISC | M680x0 32-bit CISC | M680x0 32-bit CISC |
| Coprocessor Support | MC68851 PMMU + MC68881/MC68882 FPU | MC68851 PMMU + MC68881/MC68882 FPU | MC68851 PMMU + MC68881/MC68882 FPU |
주요 차별점
- Same-hermeticity -FR finish for flight-qualified boards (vs MC68SECCFU20B1 (base))
- -FE package outline compatibility (vs MC68020FE20E)
- Officially Obsolete with licensed aftermarket supply (vs Newer 68040 / 68060 family parts)
설계 노트
Estimated: the 68020 CQFP package dissipates approximately 1.5 W to 2.5 W at 20 MHz depending on output loading and bus-switching activity. Use copper heat-spreaders or conduction-cooled chassis per the VME board-level thermal envelope; do not assume the ceramic package alone can sustain thermal conduction to a cold wall - apply thermal interface material (TIM) rated for -55 C to +125 C mission profiles.
CQFP ceramic packages are not compatible with standard plastic-QFP reflow profiles. Use a controlled soak-and-spike profile with a peak below 280 C and a maximum dwell above 220 C not exceeding 60 seconds. Inspect solder joints to IPC-A-610 Class 3 when reliability grading demands it; wicking and lead-stand-off on CQFP leads require careful paste-stencil aperture design.
Do not assume the -FR suffix implies RoHS compliance; CQFP ceramic packages typically use SnPb finishes. When sourcing for RoHS programs, request confirmation from the franchised distributor. Also note that 68020 dynamic bus sizing must be correctly configured in the FC0-FC2 function codes - mismatched boot-mode logic levels prevent external 8-bit ROM/PROM from booting the system, leading to seemingly dead boards on first power-up.
Place the 68020 with the 25 MHz (4x clock) crystal as close as possible to the CLK and EXTAL pins to minimize jitter; route the 32-bit data bus as a matched-length group with the 32-bit address bus on adjacent layers to control skew. Keep the 68020's HALT and RESET inputs debounced to avoid spurious MMU table-walk retries during cold-start. Reserve a guard ring around the address bus to limit crosstalk into analog front-ends on mixed-signal boards.
The 68020 family drives TTL-level signals with relatively slow edge rates (typically 3-5 ns rise) by modern standards, but the wide 32-bit bus and 20 MHz clock can still generate ground bounce under simultaneous switching. Use a multi-layer PCB with dedicated ground planes and place 0.1 uF ceramic decoupling at every four VCC pins; bulk tantalum or polymer decoupling per VCC rail is recommended for legacy VME platforms.
규정 준수 정보
CQFP ceramic packages typically use SnPb finishes and are not RoHS / lead-free by default. No manufacturer compliance certification can be located in the verified web data; values set to 'unknown' rather than assumed.
