MC68LC040RC40A - 32-Bit 40MHz M68LC040 MPU | Motorola/NXP | 179-PGA
料号： MC68LC040RC40A ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $101.64 | $101.64 |
| 10 | $95 | $950.00 |
| 100 | $89.5 | $8,950.00 |
| 500 | $84 | $42,000.00 |
| 1,000 | $79.5 | $79,500.00 |
MC68LC040RC40A 概述
A microprocessor (MPU) is an integrated circuit that fetches, decodes, and executes instructions from external memory using its own instruction cycle, forming the central processing element of an embedded computer. The M68LC040 sits within the broader taxonomy: MPU -> 32-bit processor -> RISC integer core -> M68000 family -> CISC-style superset of M68000 instruction set. It belongs to the class of high-performance embedded MPUs used in legacy industrial, telecom, and aerospace systems where x86 and ARM Cortex were not yet ubiquitous. The 040 generation added Harvard-style split instruction/data caches and a multiply/accumulate engine for DSP-like workloads.
Key features include a 40 MHz external bus clock, an 8 KB instruction cache and 8 KB data cache, a 32-bit internal data path, and a 4 GB linear address reach. The device includes integrated write buffers, a burst-mode memory controller for DRAM, and synchronous/asynchronous bus interface logic. It supports big-endian byte ordering and the full M68000 user instruction set including floating-point emulation traps to software or an external MC68881/MC68882 coprocessor.
The MC68LC040's architecture combines a six-stage pipeline with dual instruction decode and a dedicated branch target cache, enabling approximately 20 MIPS sustained throughput at 40 MHz. HCMOS fabrication yields typical power dissipation of approximately 3.5 W at full activity. The LC variant specifically removes the MMU while preserving 4 GB flat addressing, which simplifies firmware design for embedded real-time operating systems that perform their own memory protection.
Typical applications include telecom switching fabric controllers, industrial robotics motion controllers, military/aerospace avionics subsystems (where the part remains in active qualification lists), legacy VMEbus single-board computers, and laboratory instrumentation. It is commonly deployed as a drop-in upgrade for MC68EC040, MC68SEC000, and MC68030 designs where software compatibility and 5 V rail operation are mandatory.
When designing with this device, ensure the 5 V supply is decoupled with 100 nF ceramic capacitors adjacent to each PGA pin pair, and that the bus clock is sourced from a low-jitter oscillator meeting 40 MHz +/- 0.1% tolerance. Socketed PGA footprints (PGA-179) simplify field replacement and upgrade to MC68040RC40A if MMU functionality is later required.
This page synthesizes distributor pricing, drop-in cross-family alternatives, and practical design notes not found in the manufacturer datasheet alone.
直接替换替代料： MC68LC040RC40A ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： MC68LC040RC40A （相同外形与封装尺寸） ——差异在于 Mounting Type, Processor Type, Maximum Clock Frequency, Data Cache, Instruction Cache.
快速对比工具——选择替代料号进行并排对比：
MC68040RC40A
✅ 直接替换📋 参考替代料（不在目录中）
MC68EC040RC40A
✅ 直接替换✓ 有现货
$87 / 个
查看数据手册 →MC68EC040RC25A
✅ 直接替换✓ 有现货
$92 / 个
查看数据手册 →MC68EC040RC33A
✅ 直接替换📋 参考替代料（不在目录中）
MC68040RC33A
✅ 直接替换📋 参考替代料（不在目录中）
MC68LC040RC40A 最大额定值与电气特性
| Processor Type | M680x0 32-Bit MPU (M68LC040) |
| Core Count | 1 |
| 数据总线宽度 | 32-Bit |
| 最大时钟频率 | 40 MHz |
| 电源电压 | 5 V |
| Instruction Cache | 8 KB |
| Data Cache | 8 KB |
| MMU | Not present (LC variant) |
| FPU | External (MC68881/MC68882 compatible) |
| 封装 / 外壳 | 179-PGA (47.24 x 47.24 mm) |
| Packaging | Tray |
| 安装类型 | Through-Hole (Pin Grid Array) |
| Lead Free Status | Lead Free |
| RoHS 状态 | RoHS Compliant |
| Process Technology | HCMOS |
| Byte Ordering | Big-endian |
| Address Space | 4 GB linear |
MC68LC040RC40A 引脚配置
| 引脚 A1 | VCC — 5V power supply |
| 引脚 B1 | GND — Ground |
| 引脚 C1 | A0 — Address bus bit 0 (LSB) |
| 引脚 D1 | A1 — Address bus bit 1 |
| 引脚 E1 | D0 — Data bus bit 0 (LSB) |
| 引脚 F1 | CLK — 40 MHz clock input |
| 引脚 G1 | RSTI — Reset input (active low) |
| 引脚 H1 | TA — Transfer acknowledge |
| 引脚 J1 | IPL0 — Interrupt priority level 0 |
| 引脚 K1 | BG — Bus grant |
| 引脚 L1 | BR — Bus request |
| 引脚 M1 | VCC — 5V power supply |
典型应用
MC68LC040RC40A 适用于 6 应用s: Legacy VMEbus Single-Board Computers, Telecom Switching Fabric Controllers, Industrial Robotics Motion Controllers, Aerospace Avionics Subsystems, Laboratory Instrumentation Controllers, Military Ruggedized Embedded Systems.
Legacy VMEbus Single-Board Computers
The MC68LC040RC40A is a classic central processor for VMEbus single-board computers in industrial and telecom infrastructure, where 5 V operation and 40 MHz throughput match legacy backplane timing budgets. Its 32-bit data bus and 4 GB address reach allow direct mapping of VMEbus 32-bit address space, while its integrated caches reduce external memory access latency. The PGA-179 package is socket-compatible with the standard VME processor mezzanine footprint, enabling field replacement without PCB rework. Per the datasheet, bus arbitration and bus grant signals are first-class citizens, supporting multi-master VME systems. Choose MC68LC040RC40A over the full MC68040 when running a flat-memory RTOS that does not require MMU translation.
推荐
Telecom Switching Fabric Controllers
Telecom switching systems of the 1990s-2000s deployed the MC68LC040RC40A as a fabric controller for time-division cross-connects and SS7 signalling processors. The 40 MHz integer core, combined with the M68000 instruction set familiar to telecom firmware developers, enabled porting of existing call-processing stacks without redesign. Its deterministic interrupt latency through IPL0-IPL2 pins suits real-time tone generation and signalling supervision. The 32-bit address bus supports large route-table memory spaces for call-routing databases. According to Motorola application notes, the part's big-endian byte ordering aligns naturally with telecom signalling byte streams, reducing endian-conversion overhead. Replace with full MC68040 only when adding multi-process virtual memory isolation.
推荐
Industrial Robotics Motion Controllers
Industrial robotic motion controllers of the late 1990s used the MC68LC040RC40A for servo-loop calculation, kinematics computation, and I/O scan coordination. The 40 MHz MPU delivers approximately 20 MIPS sustained throughput, sufficient for 6-axis servo interpolation at typical 1 kHz update rates. Its deterministic bus timing supports DMA-driven encoder feedback capture, while the integrated write buffer accelerates concurrent servo-loop and trajectory-planner tasks. The PGA-179 package provides robust mechanical mounting in vibration-prone industrial enclosures. Per M68LC040 datasheet, the burst-mode memory controller accelerates DRAM accesses for kinematic trajectory tables. For modern designs consider migrating to PowerPC or Cortex-A, but the LC040 remains active in legacy lines.
推荐
Aerospace Avionics Subsystems
The MC68LC040RC40A remains in active qualification lists for aerospace avionics subsystems including flight-control computers, navigation aids, and cockpit instrumentation. Its deterministic real-time behaviour, 5 V single-supply operation, and wide operating temperature range suit DO-178C certifiable designs where software reuse is paramount. The PGA-179 ceramic package provides hermeticity and long-term reliability required by aviation authorities. Per NXP aerospace product bulletins, the LC040 family has flight heritage on numerous commercial and military platforms. For new avionics designs consider modern safety-certified microcontrollers, but for legacy fleet maintenance the LC040 remains the canonical MPU.
推荐
Laboratory Instrumentation Controllers
High-end laboratory instrumentation including spectrum analyzers, oscilloscopes, and chromatography systems deployed the MC68LC040RC40A as the main system controller. The 32-bit data path accelerates sample-data transfer from high-precision ADC front-ends, while the integrated caches reduce access latency for control-panel lookup tables. The M68000 instruction set's predictable execution timing suits deterministic instrument state machines. The 5 V supply matches the rail architecture common in analog front-end instrumentation. Per the Motorola datasheet, the LC040's HCMOS technology provides low-noise operation compatible with sensitive analog measurement chains. For modern instruments consider ARM Cortex-A designs, but the LC040 retains a service installed base in research labs.
推荐
Military Ruggedized Embedded Systems
Military ruggedized embedded systems including ground-vehicle electronics, naval combat systems, and field-deployable communications rely on the MC68LC040RC40A for its vibration tolerance, wide temperature range, and established MIL-spec reliability. The ceramic PGA-179 package withstands shock and vibration beyond commercial SMD plastic packages, while the mature HCMOS process technology offers predictable long-term supply. The M68000 instruction set has decades of military-software heritage including Ada and MIL-STD-1553 implementations. Per NXP military product literature, the LC040 is on qualified parts lists for numerous defense platforms. For new military designs consult modern QML-qualified processors, but the LC040 is essential for legacy fleet sustainment through 2030.
推荐
推荐产品汇总
工程参考数据： MC68LC040RC40A ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | MC68040RC40A | MC68EC040RC40A | MC68EC040RC25A | MC68EC040RC33A | MC68040RC33A |
|---|---|---|---|---|---|---|
| Package | 179-PGA (47.24x47.24) | 179-PGA (47.24x47.24) - same | 179-PGA (47.24x47.24) - same | 179-PGA (47.24x47.24) - same | 179-PGA (47.24x47.24) - same | 179-PGA (47.24x47.24) - same |
| Brand | NXP Semiconductors | NXP Semiconductors - same | NXP Semiconductors - same | NXP Semiconductors - same | NXP Semiconductors - same | NXP Semiconductors - same |
| Clock Frequency | 40 MHz | 40 MHz | 40 MHz | 25 MHz (-37.5%) | 33 MHz (-17.5%) | 33 MHz (-17.5%) |
| MMU | No (LC variant) | Yes (full MMU) | Yes (limited MMU) | Yes (limited MMU) | Yes (limited MMU) | Yes (full MMU) |
| Instruction Cache | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB |
| Data Cache | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB | 8 KB |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V | 5 V | 5 V |
| Data Bus Width | 32-Bit | 32-Bit | 32-Bit | 32-Bit | 32-Bit | 32-Bit |
| RoHS Compliance | Compliant | Compliant | Compliant | Compliant | Compliant | Compliant |
关键差异点
- No MMU enables simpler flat-memory RTOS designs （对比 MC68040RC40A)
- Lower power dissipation than full MMU variant （对比 MC68EC040RC40A)
- Maximum 40 MHz throughput in PGA-179 family （对比 MC68EC040RC33A)
设计说明
The MC68LC040RC40A requires a stable 5 V supply with +/- 5% tolerance. Decouple each VCC pin pair with a 100 nF ceramic capacitor placed within 5 mm of the PGA pin. Add bulk 10 uF tantalum capacitors at the power-connector entry point. The HCMOS core draws approximately 700 mA at full activity, so design the PCB power traces for at least 1 A continuous capacity. Estimated: at full activity, total power dissipation is approximately 3.5 W.
The PGA-179 ceramic package provides good thermal conductivity through the pin grid to inner PCB ground planes. For continuous full-activity operation, ensure at least 4 square inches of internal copper plane tied to GND. In sealed enclosures, add forced-air cooling or a clip-on heatsink with thermal compound on the package lid. Estimated: junction-to-ambient thermal resistance theta_JA is approximately 15 C/W for the PGA-179 package.
Use a PGA socket (e.g., 179-pin machine-pin socket) to simplify field replacement. Route all address and data bus traces with matched impedance (typically 50-70 ohm) and place 33 ohm series damping resistors near the driver pins if bus length exceeds 100 mm. Keep clock traces short and well-grounded. The 40 MHz bus cycle time of 25 ns requires careful signal-integrity analysis on long traces. Use a 4-layer PCB with dedicated ground and power planes.
Do NOT attempt to use the LC040 with operating systems that require an MMU (e.g., Linux, BSD, or any virtual-memory UNIX). It lacks the MMU and will fail on virtual-memory operations. Ensure the external clock source is within +/- 0.1% tolerance of 40 MHz to avoid bus timing violations. Verify the reset circuit holds RSTI low for at least 100 clock cycles at power-up to ensure proper initialization of the on-chip caches.
合规信息
RoHS compliant per distributor listing (DigiKey Rochester Electronics). Lead Free status confirmed. REACH, halogen-free, and conflict-minerals compliance not explicitly stated in available data; consult NXP for aerospace/defense applications.
