MC68HC000RC12 - 12MHz 32-bit M68K MPU, 68-PGA | NXP
MPN: MC68HC000RC12 ✓ AktifMC68HC000RC12 Genel Bakış
What is a microprocessor in the M68K family? The M68K (Motorola 68000) architecture is a CISC 32-bit microprocessor family first introduced by Motorola in 1979. It uses a 32-bit programming model (eight data registers A0-A7, A7 being the stack pointer, and eight address registers D0-D7) with a 16-bit external data path on most variants, and addresses a 24-bit (16 MB) memory space. Through successive generations (MC68000, MC68HC000, MC68EC000, MC68010, MC68020, MC68030, MC68040, MC68060), it powered classic workstations (Sun-1, early Macintosh, Atari ST, Amiga), arcade systems, embedded controllers, and aerospace equipment.
The MC68HC000 differs from the original NMOS MC68000 by using HCMOS fabrication, which cuts typical power consumption roughly in half while maintaining object-code compatibility with the original instruction set. Key features of the MC68HC000RC12 include a 12 MHz maximum clock, a 16-bit asynchronous data bus, a 24-bit address bus (16 MB address space), seven interrupt levels (IPL0-IPL2), a vectored interrupt controller, and a 32-bit barrel shifter on chip. Static operation allows the clock to be stopped for low-power standby modes, useful in battery-backed industrial and instrumentation equipment.
Architecturally, the part integrates microcoded CISC instructions with a three-stage pipeline (instruction fetch, decode, execute) and supports addressing modes such as pre-decrement, post-increment, and indexed with displacement and scaling on later variants. The 68-PGA ceramic package provides rugged mechanical and thermal characteristics suited to industrial, military, and aerospace environments where plastic packages would be insufficient.
Typical applications include legacy industrial control systems, telecommunications switching equipment, factory automation PLCs, military and aerospace embedded controllers, and retro-computing restorations. The ceramic PGA is also favored in defense and avionics programs where hermetic packaging is mandated. The wide supply tolerance and low quiescent current also suit instrumentation with isolated power.
When designing with the MC68HC000RC12, ensure a minimum of two wait states for slow peripherals unless external cycle-stealing logic is added; the part shares its bus cycle timing with the MC68000, so MC68000 reference schematics remain valid with HCMOS power-supply adjustments. Designers upgrading from MC68000 should verify HCMOS-specific timing parameters in the latest NXP datasheet.
This page synthesizes distributor pricing, drop-in pin-compatible M68K alternatives, and practical design notes not found in the legacy Motorola datasheets. Lifecycle status, current stock, and 12 MHz part variants have been cross-checked against NXP and authorized distributors as of 2026-10-17.
Drop-in alternatifler için MC68HC000RC12 — aynı paket, pin-başına uyumlu. PCB yeniden montajı gerektiren farklı paket bileşenleri dışlanmıştır.
Bu Serideki Variantlar
Yedek parça uyumlu olan aynı serideki modeller MC68HC000RC12 (aynı form faktörü ve ayağa oturma) — farklı olan Maximum Clock Frequency, Mounting Type, Supply Voltage, Core, Core Architecture.
MC68HC000RC8
✅ YerleştirmeFiyat için iletişime geçin
Veri Şablonunu Görüntüle →MC68EC000RC12
✅ Yerleştirme📋 Katalogda Olmayan Referans Alternatifi
MC68HC001RC12
✅ Yerleştirme📋 Katalogda Olmayan Referans Alternatifi
MC68000RC12
✅ Yerleştirme📋 Katalogda Olmayan Referans Alternatifi
MC68HC000FN12
✅ Yerleştirme📋 Katalogda Olmayan Referans Alternatifi
MC68HC000RC12 Maksimum Değerlendirmeler & Elektriksel Özellikler
| Processor Type | M68K Microprocessor (M68000 family) |
| Core | M68000 |
| Veri Bus Genişliği | 16-bit external / 32-bit internal |
| Address Bus Width | 24-bit |
| Azami Saat Hızı | 12 MHz |
| Besleme Gerilimi | 5 V |
| Paket | 68-pin PGA (ceramic, BCPGA) 26.92 x 26.92 mm |
| Montaj Türü | Through-Hole (PGA socket) |
| Pin Sayısı | 68 |
| Instruction Set Architecture | CISC, 32-bit, M68K object-code compatible |
| Internal Registers | 8 data (D0-D7) + 8 address (A0-A7, A7=SP) |
| On-chip Features | 32-bit barrel shifter, vectored interrupts (IPL0-IPL2) |
| Static Operation | Yes (clock may be stopped) |
| Lead Free / RoHS | Lead Free / RoHS Compliant |
| Packaging | Tray |
MC68HC000RC12 68-pin pga (ceramic, bcpga) 26.92 x 26.92 mm Pin Yapısı Kılavuzu
MC68HC000RC12 (68-pin pga (ceramic, bcpga) 26.92 x 26.92 mm paket) için pin yapısı. Bu dijital IC, GPIO, iletişim arayüzleri (UART, SPI, I2C) ve güç pinleri içerir. Alternatif pin işlevleri ve yapılandırma seçenekleri için üretici veri kitapçığını referans alın. Tünel sistem tasarımı ve PCB yerleşimi için temel bir bileşendir.
Ayrıntılı pin çıkış verisi mevcut değil: MC68HC000RC12.
Aşağıdaki veri sayfası tam pin konfigürasyonu için.
Tipik Uygulamalar
MC68HC000RC12 için uygundur 6 uygulamas: Legacy Industrial Control Systems, Telecommunications Switching Equipment, Military and Aerospace Embedded Controllers, Factory Automation PLCs and Robotics, Retro-Computing and Hardware Preservation, Test and Measurement Instrumentation.
Legacy Industrial Control Systems
The MC68HC000RC12 is widely deployed as the central processor in legacy industrial control systems including PLCs, motor drives, and SCADA terminals that were designed around the M68K architecture in the late 1980s and 1990s. Its 12 MHz clock and 32-bit internal registers deliver 2.7 MIPS, which is ample for PID loops, HMI screen refresh, and Modbus/Profibus fieldbus stacks of that era. The HCMOS design cuts power consumption roughly in half versus the original NMOS MC68000, reducing thermal stress in sealed control cabinets. The static core allows clock-stopped standby, useful for battery-backed remote terminal units. Sustaining-engineering teams keep M68K controllers in service because re-validation cost dominates over the modest savings of an ARM replacement.
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Telecommunications Switching Equipment
The MC68HC000RC12 powered telecom switching equipment, base-station controllers, and central-office line cards throughout the 1990s and remains in service today for sustaining engineering of those platforms. The M68K CISC instruction set was preferred for its deterministic interrupt latency, which is critical when servicing T1/E1 framers, ISDN PRI stacks, and SS7 signaling. At 12 MHz with vectored interrupts, the processor handles the seven-level IPL priority scheme required for multi-protocol telecom stacks. The 68-PGA ceramic package suits the long operating-temperature ranges of central-office environments. Long-lifecycle telecom programs continue to source this part through authorized channels like Rochester Electronics.
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Military and Aerospace Embedded Controllers
The MC68HC000RC12 is specified in numerous defense and aerospace platforms where the hermetic 68-pin ceramic PGA package and M68K object code base have decades of flight or mission history. Avionics subsystems, weapons-system controllers, and ruggedized ground vehicles use this processor because the wide-temperature-range ceramic PGA survives the harsh thermal and vibration profile of military qualification. M68K object-code compatibility preserves the extensive validated firmware libraries accumulated across these programs. Sustaining-engineering contracts typically run 20-plus years, and the M68K family remains the lowest-risk path to keep these platforms in service.
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Factory Automation PLCs and Robotics
The MC68HC000RC12 served as the CPU in numerous factory-automation PLCs, robotic cell controllers, and CNC machine controllers during the 1990s and remains in service for sustaining engineering. The 24-bit address space (16 MB) is well-matched to ladder-logic interpreters, motion-control trajectory planners, and on-board diagnostic firmware of that era. The 12 MHz clock drives typical scan times of a few milliseconds per thousand I/O points, which remains acceptable for legacy lines. HCMOS low power consumption simplifies sealed enclosure thermal design. Long-lived automotive and pharmaceutical plants continue to operate these controllers, requiring continued M68K supply.
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Retro-Computing and Hardware Preservation
The MC68HC000RC12 is a prized component in retro-computing restorations of classic workstations and home computers from the late 1980s and early 1990s. Machines such as early Sun workstations, Atari ST, early Macintosh, Amiga, and various arcade boards used MC68000-family processors and benefit from authentic part replacements when restoring original behavior. The 12 MHz speed grade matches the original equipment clock for many of these platforms. The ceramic PGA package also suits high-fidelity clones and FPGA-based emulators that maintain pin-compatible daughterboards. Hobbyists and museums source original-spec parts to keep heritage computing hardware operational.
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Test and Measurement Instrumentation
The MC68HC000RC12 served as the controller CPU in oscilloscopes, spectrum analyzers, logic analyzers, and other test-and-measurement instruments of the early 1990s, and is sustained today by repair depots and instrument-calibration houses. The static HCMOS core allows clock-stopped low-power standby between measurement acquisitions, preserving battery life in portable instruments. The 32-bit internal architecture accelerates floating-point math when paired with an external MC68881 or MC68882 coprocessor, which was a common pairing in high-end instruments of that era. The wide 5 V tolerance and ceramic PGA package suit the long calibration cycles of certified test labs.
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Önerilen Ürünler Özeti
Mühendislik referans verileri: MC68HC000RC12 — karşılaştırma, tasarım rehberi ve uyumluluk bilgileri.
Seçim Kılavuzu
Alternatiflerle Karşılaştırma
| Parametre | Bu Ürün | MC68HC000RC8 | MC68EC000RC12 | MC68HC001RC12 | MC68000RC12 | MC68HC000FN12 |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 68-pin PGA (ceramic, BCPGA) 26.92 x 26.92 mm | 68-pin PGA (ceramic) - same | 68-pin PGA (ceramic) - same | 68-pin PGA (ceramic) - same | 68-pin PGA (ceramic) - same | 68-pin PLCC - different package, requires adapter socket |
| Maximum Clock Frequency | 12 MHz | 8 MHz | 12 MHz | 12 MHz | 12 MHz | 12 MHz |
| Architecture / Fabrication | M68K / HCMOS | M68K / HCMOS | M68K EC000 / HCMOS | M68K / HCMOS with bus arbiter | M68K / NMOS (original, higher power) | M68K / HCMOS |
| Static Operation | Yes | Yes | Yes | Yes | No | Yes |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V | 5 V | 5 V |
| Power Consumption vs HC000 | Reference (HCMOS baseline) | Lower at 8 MHz | Similar (HCMOS) | Similar (HCMOS + arbiter) | Roughly 2x higher (NMOS) | Similar (HCMOS) |
| Object Code Compatibility | M68K (full instruction set) | M68K (full instruction set) | M68K subset (no MOVE from SR, no LINEPACK) | M68K (full instruction set) | M68K (full instruction set) | M68K (full instruction set) |
| RoHS / Lead-Free | Compliant / Lead-Free | Compliant | Compliant | Compliant | Compliant (variant-dependent) | Compliant |
Ana Farklılayıcılar
- Drop-in 12 MHz speed grade with HCMOS efficiency (karşılaştırma:MC68000RC12)
- Full M68K instruction set versus EC000 subset (karşılaştırma:MC68EC000RC12)
- Higher 12 MHz throughput over 8 MHz siblings (karşılaştırma:MC68HC000RC8)
- No integrated bus arbitration - pure CPU core (karşılaştırma:MC68HC001RC12)
Tasarım Notları
The MC68HC000RC12 uses HCMOS fabrication, which typically draws 50 percent less current than the original NMOS MC68000 at the same clock. Designers migrating from MC68000 reference designs must revise bulk-decoupling capacitor sizing because inrush current peaks are also reduced, but transient response on heavy bus cycles still requires 0.1 uF ceramic + 10 uF tantalum near each Vcc/GND pin pair. Operating at 5 V +/- 5 percent is the standard tolerance; designs using a 3.3 V rail cannot use this part without a separate 5 V regulator.
The 68-pin ceramic PGA package requires a PGA socket with adequate pin length to ensure reliable insertion force and thermal contact. Designers should retain a guard band of at least 0.5 mm around the PGA footprint on the PCB for cleaning access, and ensure socket retention is adequate for the vibration profile of the target environment (industrial, aerospace). Trace routing should preserve the bus-cycle timing constraints documented in the M68K family reference manual; long address or data traces require extra wait states to remain within the 12 MHz AC timing.
Common pitfalls when designing with the MC68HC000RC12 include: (1) forgetting that DTACK must be returned within the bus-cycle window or the processor will hang with bus-error recovery required; (2) mis-wiring FC0-FC2 which select CPU/DMA/supervisor/user cycles and are easy to swap with general-purpose outputs; (3) confusing the 68HC000 with the 68EC000 instruction subset, since the EC variant lacks MOVE-from-SR and LINEPACK and firmware must be re-assembled; (4) omitting proper reset sequencing where RESET and HALT must be released together with the clock stable; (5) using a slow clock-startup oscillator that violates the minimum pulse-width spec at power-on.
Uyumluluk Bilgisi
RoHS compliant per DigiKey and FindIC cross-reference data. Lead-free per distributor listings. Halogen-free status not explicitly documented in the verified web data. AEC-Q100 not applicable for legacy M68K ceramic PGA microprocessor family. Operating temperature range not documented in the verified web excerpts - listed as [DATA_NEEDED] in specs.
