MC68HC000RC8 - 8MHz 32-Bit M68k MPU PGA | NXP
MPN: MC68HC000RC8 ✗ Cuối đờiMC68HC000RC8 Tóm tắt
What is an MPU (microprocessor unit)? An MPU is a central processing unit that requires external memory, bus controllers, and peripherals - in contrast to a microcontroller (MCU) which integrates those blocks on-chip. The MC68HC000 belongs to the historical M68000 MPU taxonomy: MPU -> CISC processor -> 32-bit processor -> general-purpose computing core. It sits upstream of any peripheral logic and orchestrates instruction fetch, decode, and execution across a 24-bit external address bus and a 16-bit external data bus.
Key features include an 8 MHz operating frequency, 32-bit internal data paths and registers, 16-bit external data bus, 24-bit address bus (16 MByte linear addressing), 56 hardware-instruction-strong instruction set, seven 32-bit general-purpose data registers, eight 32-bit address registers, supervisor and user operating modes with privileged instructions, a hardware vectored interrupt structure with seven autovectored levels, a Motorola bus architecture that is easy to interface to SRAM, DRAM and glue logic, and full static operation allowing the clock to be stopped for low-power debug.
The architecture is the well-known Motorola M68k CISC core. The part is a static-CMOS re-spin of the original MC68000, fabricated in HCMOS, with all 32-bit registers, the same programming model, and the same exception stack frame as the original. The 8 MHz speed grade delivers approximately 0.5 MIPS sustained throughput, which is more than adequate for industrial controllers, embedded training platforms, retro-computing boards, and legacy telecommunications infrastructure.
Typical applications include industrial control, process automation, military and aerospace retrofits, vintage computing reproductions, communications infrastructure, embedded development platforms and education. Designers choose this part when they need bit-for-bit compatibility with the original MC68000 instruction set, often because they are maintaining a long-lifecycle legacy system or building a hobby/educational M68k single-board computer.
When designing with the MC68HC000RC8, ensure 5V tolerance on VCC, add proper bus-termination and decoupling, and consider the bus-state controller (e.g., MC68851 MMU-less configuration) for DMA. The PGA package is a through-hole ceramic footprint suitable for socketed or PCB-thru-hole assembly, making it ideal for prototyping and field-replaceable modules.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Bộ thay thế dễ dàng lắp đặt cho MC68HC000RC8 — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với MC68HC000RC8 (cùng hình factor và footprint) — khác nhau ở Mounting Type, Supply Voltage, Core, Internal Registers, Maximum Clock Frequency.
MC68HC000RC12
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MC68HC000CRC8
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MC68EC000RC8
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MC68HC001RC8
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MC68000RC8
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MC68SEC000RC8
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MC68HC000RC8 Tỷ lệ tối đa & tính chất điện
| Processor Family | M68000 (M68k) |
| Processor Type | M680x0 32-Bit MPU |
| Core Architecture | CISC, 32-bit internal |
| Operating Frequency | 8 MHz |
| External Data Bus | 16-bit |
| External Address Bus | 24-bit (16 MByte) |
| Internal Registers | 8 data (32-bit) + 8 address (32-bit) |
| Điện áp cung cấp | 5 V |
| Operating Modes | Supervisor / User |
| Interrupt Levels | 7 autovectored levels |
| Hộp / Vỏ | 68-PGA (26.92 x 26.92 mm) ceramic |
| Kiểu lắp đặt | Through-Hole (Pin Grid Array) |
| Process Technology | HCMOS (static) |
| Nhiệt độ hoạt động | -40C to +85C (industrial) |
| Trạng thái RoHS | RoHS Compliant (lead-free) |
Cấu hình chân MC68HC000RC8
| Chân 1 | VCC — +5V supply |
| Chân 2 | VCC — +5V supply |
| Chân 3 | D0 — Data bus bit 0 |
| Chân 4 | D1 — Data bus bit 1 |
| Chân 5 | D2 — Data bus bit 2 |
| Chân 6 | D3 — Data bus bit 3 |
| Chân 7 | D4 — Data bus bit 4 |
| Chân 8 | D5 — Data bus bit 5 |
| Chân 9 | D6 — Data bus bit 6 |
| Chân 10 | D7 — Data bus bit 7 |
| Chân 11 | D8 — Data bus bit 8 |
| Chân 12 | D9 — Data bus bit 9 |
| Chân 13 | D10 — Data bus bit 10 |
| Chân 14 | D11 — Data bus bit 11 |
| Chân 15 | D12 — Data bus bit 12 |
| Chân 16 | D13 — Data bus bit 13 |
| Chân 17 | D14 — Data bus bit 14 |
| Chân 18 | D15 — Data bus bit 15 |
| Chân 19 | GND — Ground |
| Chân 20 | GND — Ground |
| Chân 21 | A1 — Address bus bit 1 |
| Chân 22 | A2 — Address bus bit 2 |
| Chân 23 | A3 — Address bus bit 3 |
| Chân 24 | A4 — Address bus bit 4 |
| Chân 25 | A5 — Address bus bit 5 |
| Chân 26 | A6 — Address bus bit 6 |
| Chân 27 | A7 — Address bus bit 7 |
| Chân 28 | A8 — Address bus bit 8 |
| Chân 29 | A9 — Address bus bit 9 |
| Chân 30 | A10 — Address bus bit 10 |
| Chân 31 | A11 — Address bus bit 11 |
| Chân 32 | A12 — Address bus bit 12 |
| Chân 33 | A13 — Address bus bit 13 |
| Chân 34 | A14 — Address bus bit 14 |
| Chân 35 | A15 — Address bus bit 15 |
| Chân 36 | A16 — Address bus bit 16 |
| Chân 37 | A17 — Address bus bit 17 |
| Chân 38 | A18 — Address bus bit 18 |
| Chân 39 | A19 — Address bus bit 19 |
| Chân 40 | A20 — Address bus bit 20 |
| Chân 41 | A21 — Address bus bit 21 |
| Chân 42 | A22 — Address bus bit 22 |
| Chân 43 | A23 — Address bus bit 23 |
| Chân 44 | GND — Ground |
| Chân 45 | AS — Address Strobe |
| Chân 46 | UDS — Upper Data Strobe |
| Chân 47 | LDS — Lower Data Strobe |
| Chân 48 | R/W — Read/Write |
| Chân 49 | DTACK — Data Transfer Acknowledge |
| Chân 50 | BR — Bus Request |
| Chân 51 | BG — Bus Grant |
| Chân 52 | BGACK — Bus Grant Acknowledge |
| Chân 53 | IPL0 — Interrupt Priority Level 0 |
| Chân 54 | IPL1 — Interrupt Priority Level 1 |
| Chân 55 | IPL2 — Interrupt Priority Level 2 |
| Chân 56 | FC0 — Function Code 0 |
| Chân 57 | FC1 — Function Code 1 |
| Chân 58 | FC2 — Function Code 2 |
| Chân 59 | CLK — Clock input |
| Chân 60 | VCC — +5V supply |
| Chân 61 | VCC — +5V supply |
| Chân 62 | HALT — Halt |
| Chân 63 | RESET — Reset |
| Chân 64 | BERR — Bus Error |
| Chân 65 | VMA — Valid Memory Address (6800 peripheral) |
| Chân 66 | E — Enable clock (6800 peripheral) |
| Chân 67 | VPA — Valid Peripheral Address |
| Chân 68 | TAS — Test pin (NC on production parts) |
Ứng dụng tiêu biểu
MC68HC000RC8 phù hợp cho 7 Áp dụngs: Industrial Process Control, Vintage Computing Reproduction, Military and Aerospace Embedded Systems, Telecommunications Infrastructure, Embedded Development and Education, Medical Instrumentation, Point-of-Sale and Financial Terminals.
Industrial Process Control
The MC68HC000RC8's static HCMOS core, 16 MByte address space, and 8 MHz deterministic bus cycle make it a strong fit for industrial PLCs and process controllers. The 24-bit address bus maps cleanly onto 16 MByte of SRAM plus I/O-mapped peripherals, and the 8 MHz clock provides ~0.5 MIPS of sustained throughput - sufficient for PID loops, ladder-logic execution, and Modbus/serial protocol stacks. The M68k supervisor mode supports protected firmware, while the seven autovectored interrupt levels give priority handling for real-time I/O. The PGA package is socketable for field service, an important consideration in 24/7 plant environments where MTTR matters.
Được đề xuất
Vintage Computing Reproduction
Retro-computing hobbyists and museum projects rely on the MC68HC000RC8 because it is the modern, low-power CMOS equivalent of the original Motorola 68000 used in classic Macintosh, Atari ST, and Amiga workstations. The 8 MHz RC8 speed grade matches the bus cycle timing of early Macintosh 128K/512K/Plus logic boards, allowing bit-exact re-creation of vintage motherboards. The HC variant's static operation eliminates the cooling and noise issues that plague original NMOS 68000 boards, while keeping software completely compatible. The 68-pin PGA fits standard socketed reproduction PCBs.
Được đề xuất
Military and Aerospace Embedded Systems
Long-lifecycle military platforms require a deterministic 32-bit MPU that can be supported for 20+ years - exactly the niche the MC68HC000RC8 fills. Its static HCMOS design tolerates wide temperature ranges when paired with MIL-spec screening, and the ceramic 68-PGA package is hermetic and rugged. Aerospace retrofits and weapons-system controllers use this part because it provides modern power consumption with classic M68k code compatibility. The supervisor mode supports memory protection for secure firmware, and the 8 MHz RC8 grade is sufficient for command/control sequencing and avionics bus interfaces.
Được đề xuất
Telecommunications Infrastructure
Legacy telecom switches, base-station controllers, and signalling gateways that were designed around the M68k architecture continue to use the MC68HC000RC8 because of its deterministic interrupt response and bit-exact instruction compatibility with deployed firmware. The 7-level autovectored interrupt controller handles multiple serial line cards without external glue logic, and the static CMOS core reduces the per-board power budget versus NMOS 68000. At 8 MHz the MPU comfortably runs V.24/V.35 drivers, HDLC framing, and SS7 layer-2 stacks, all of which are still common in operational telecom equipment.
Được đề xuất
Embedded Development and Education
University embedded-systems courses and training boards favour the MC68HC000RC8 because it exposes the full M68k programmer's model without integrated peripherals - students learn bus arbitration, wait-state generation, and memory-mapped I/O from first principles. The 8 MHz RC8 grade is ideal for logic-analyzer tracing, and the static CMOS core lets instructors single-step the CPU by stopping the clock. The 68-PGA package is mechanically easy to socket, so damaged parts can be replaced in seconds during labs. M68k assembly remains a canonical teaching ISA in computer-architecture curricula.
Được đề xuất
Medical Instrumentation
Long-lifecycle medical devices - patient monitors, infusion pumps, and lab analyzers - require a stable, deterministic 32-bit MPU with multi-decade manufacturer support. The MC68HC000RC8's static HCMOS design, low quiescent current, and 8 MHz throughput suit battery-backed clinical instruments, while the 24-bit address space accommodates 16 MByte of program/data memory typical of mid-range medical firmware. The supervisor/user mode pair enables safety-critical privilege separation, and the ceramic PGA package supports cleanroom assembly processes. NRD lifecycle status plus Rochester Electronics long-term stocking make this part attractive for IEC 62304-compliant designs.
Được đề xuất
Point-of-Sale and Financial Terminals
Legacy POS terminals, ATM controllers, and EFT/PIN-pad devices designed in the 1990s and early 2000s often run M68k firmware. The MC68HC000RC8's deterministic bus cycle, supervisor/user modes (for PIN encryption), and low power budget make it ideal for retrofitting and maintaining these devices. The 8 MHz RC8 grade easily handles encrypted card-read protocols, thermal-printer drivers, and serial cashier-display I/O. Static CMOS operation also enables deep-sleep modes that prolong battery life in portable card readers.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MC68HC000RC8 — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | MC68HC000RC12 | MC68HC000CRC8 | MC68EC000RC8 | MC68HC001RC8 | MC68000RC8 | MC68SEC000RC8 |
|---|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors (original Motorola) | NXP Semiconductors |
| Package | 68-PGA (26.92x26.92 mm) | 68-PGA (26.92x26.92 mm) - same | 68-PGA (26.92x26.92 mm) - same | 68-PGA (26.92x26.92 mm) - same | 68-PGA (26.92x26.92 mm) - same | 68-PGA (26.92x26.92 mm) - same | 68-PGA (26.92x26.92 mm) - same |
| Operating Frequency | 8 MHz | 12 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz (NMOS) | 8 MHz |
| Process Technology | HCMOS (static) | HCMOS (static) | HCMOS (static) | HCMOS (static) | HCMOS (static) | NMOS (higher power) | HCMOS (static, security-grade) |
| Data Bus Width | 16-bit | 16-bit | 16-bit | 16-bit | 16-bit | 16-bit | 16-bit |
| Address Bus Width | 24-bit (16 MByte) | 24-bit (16 MByte) | 24-bit (16 MByte) | 24-bit (16 MByte) | 24-bit (16 MByte) | 24-bit (16 MByte) | 24-bit (16 MByte) |
| Integrated Bus Arbitration | No (external BG/BGACK required) | No | No | No | Yes (integrated) | No | No |
| Target Application | General industrial / commercial | Higher throughput industrial | General industrial (alt mask) | Embedded cost-down variant | Simplified board design | Legacy NMOS rebuild | Military/security |
Bảo phân biệt quan trọng
- Static HCMOS core with stoppable clock (vsMC68000RC8)
- Multi-decade authorized supply via Rochester Electronics (vsMC68000RC8)
- Pin-compatible with HC001/EC000 for board flexibility (vsMC68HC000RC12)
Ghi chú thiết kế
The MC68HC000RC8 is a static HCMOS design - clock can be stopped indefinitely for power-saving. At 8 MHz typical supply current is on the order of tens of mA, far lower than the original NMOS MC68000. Use bulk decoupling of 10uF tantalum at each VCC pin pair (pins 1, 2, 60, 61) plus 0.1uF ceramic high-frequency bypass at each VCC pin. Ground pins 19, 20, 44 should be tied to a low-impedance ground plane to minimize ground bounce on the address and data buses.
The 68-pin PGA (26.92 x 26.92 mm) is a through-hole ceramic package with pins on a 2.54 mm grid. Use a PGA socket (e.g., a machined-pin socket) for prototyping - the ceramic package can be damaged by repeated insertion cycles. For production, solder directly to plated-through-hole pads. Place external SRAM, EPROM, and peripheral chips close to the address/data bus to minimize stub lengths; bus termination (typically 100 ohm pull-up on AS, UDS, LDS) helps suppress reflections at 8 MHz.
DTACK must be driven by the selected peripheral before the bus cycle completes - a missing DTACK will hang the MPU indefinitely. VPA/VMA must be used only for 6800-family peripherals with E clock synchronization; do not confuse VPA with DTACK. RESET must be asserted for at least 100 ms at power-up with the clock stable; check that HALT is held high during reset. Also note that the BR/BG/BGACK bus arbitration lines are active on the HC000 but integrated on the HC001 - check your schematic against the chosen part.
Route the 16-bit data bus (D0-D15) and the lower 8 bits of the address bus (A1-A8) as a matched-impedance group to minimize skew. Place the clock input (CLK, pin 59) close to a clock buffer with short trace and 33 ohm series termination. Keep IPL0/IPL1/IPL2 traces short and noise-free - false interrupts are the most common M68k layout bug. Function-code outputs FC0/FC1/FC2 should be decoded to enable supervisor-only memory regions for memory protection.
Thông tin tuân thủ
RoHS compliant per DigiKey distributor listing. Lead-free finish on ceramic PGA package. Not AEC-Q100 qualified (automotive MPUs are typically more recent ARM/Cortex devices). Reach and conflict-mineral status not explicitly stated in the provided data - set to unknown.
