MC68EC040RC25A - 32-Bit 25MHz M68040 MPU | NXP 179-PGA
MPN: MC68EC040RC25A ✗ סוף ייצורMC68EC040RC25A סקירה
An MPU (Microprocessor Unit) is the central execution engine of a computing system, fetching instructions from memory, decoding them, and driving external memory and peripheral devices through its address and data buses. The MC68EC040RC25A belongs to the CISC (Complex Instruction Set Computer) M68000 microprocessor family and inherits the 32-bit linear address space, orthogonal register set, and memory management primitives of that lineage. Within the broader taxonomy, it sits at: MPU -> 32-bit MPU -> M68k family -> M68040 generation -> embedded controller variant.
Key features include a 25 MHz maximum clock input, a 32-bit external data bus, a 32-bit address bus (4 GB linear space), on-chip 4 KB + 4 KB separate instruction and data caches, a bus interface unit with burst-mode support, and compatibility with the 68000/68010/68020/68030 instruction set (excluding FPU instructions). The device is fabricated in HCMOS technology and specified for a single 5 V supply, with TTL-compatible I/O.
Architecturally the MC68EC040RC25A uses a Harvard-style split cache with a write-back policy, dual instruction prefetch pipelines, and an integrated memory management unit that supports demand-paged virtual memory with 4-KB pages. The 'EC' variant deliberately excludes the FPU; system designers needing IEEE-754 floating-point must add an external MC68881/MC68882 coprocessor via the coprocessor interface.
Typical applications include embedded industrial controllers, laser printer engines, network routers, telecom control planes, mid-1990s workstation-class compute nodes, and legacy military/aerospace systems that standardized on the 68040 platform. The wide third-party software base (Linux/m68k, NetBSD/m68k, VxWorks) and rugged PGA package make it a long-life part for these designs.
When designing with the MC68EC040RC25A, pay particular attention to the coprocessor interface if your software issues FPU opcodes. The 179-pin ceramic PGA package requires a matching socket (e.g., PGA179) and a properly designed 4-layer or 6-layer PCB to maintain signal integrity on the 32-bit memory bus at 25 MHz.
This page synthesizes distributor pricing, drop-in alternative candidates, and design considerations drawn from manufacturer documentation that are not aggregated on a single distributor product page.
חלופות תחליף ישיר עבור MC68EC040RC25A — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם MC68EC040RC25A (אותו גורם צורה וטביעת רגל) — שונים ב Mounting Type, Processor Type, Supply Voltage, Lead Free Status, RoHS Status.
MC68EC040RC25B
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
MC68EC040RC25
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
MC68040RC25V
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
MC68EC040RC20A
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←MC68EC040RC33A
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
MC68EC040RC25A דירוגים מרביים ומאפיינים חשמליים
| Processor Type | 32-Bit MPU, M680x0 family |
| Processor Core | 68040 (EC - no FPU) |
| Number of Cores | 1 |
| רוחב אפיק נתונים | 32-Bit |
| Address Bus Width | 32-Bit (4 GB linear) |
| תדר שעון מקסימלי | 25 MHz |
| Instruction Cache | 4 KB |
| Data Cache | 4 KB |
| Floating Point Unit | Not integrated (external MC68882 required) |
| מתח אספקה | 5 V |
| מארז | 179-Pin PGA (47.24 x 47.24 mm), ceramic |
| סוג הרכבה | Through-hole (PGA socket) |
| Process Technology | HCMOS |
| Lead Free Status | Contains Lead |
| סטטוס RoHS | Non-Compliant |
| Packaging | Tray |
מדריך תצורת פינים של MC68EC040RC25A 179-pin pga (47.24 x 47.24 mm), ceramic
תצורת פינים עבור MC68EC040RC25A (מארזת 179-pin pga (47.24 x 47.24 mm), ceramic). מעגל משולב דיגיטלי זה כולל GPIO, ממשקי תקשורת (UART, SPI, I2C) ופיני מתח. יש לעיין בגיליון הנתונים של היצרן לפונקציות פינים חלופיות ולאפשרויות תצורה. חיוני לתכנון מערכות משובצות ולפריסת PCB.
אין נתוני פריסת פינים מפורטים עבור MC68EC040RC25A.
עיינו ב- גיליון נתונים עבור תצורת פינים מלאה.
יישומים טיפוסיים
MC68EC040RC25A מתאים עבור 6 יישוםs: Legacy Industrial Controller / Embedded M68k SBC, Network Router / Telecom Control Plane, Laser Printer Engine Controller, Aerospace / Military Avionics (Legacy), Workstation-Class Compute Nodes (Retro / Hobbyist), Scientific Data Acquisition Front-End.
Legacy Industrial Controller / Embedded M68k SBC
The MC68EC040RC25A suits 32-bit single-board computers (SBCs) running Linux/m68k or NetBSD/m68k where deterministic real-time response and POSIX compatibility matter. Its 25 MHz clock yields roughly 28 Dhrystone MIPS, while the 32-bit linear 4 GB address space lets the kernel map DMA buffers without segment tricks. The 179-pin ceramic PGA absorbs thermal-cycling stress in factory-floor enclosures where SMT parts on flex cables would fatigue.
מומלץ
Network Router / Telecom Control Plane
Mid-1990s router designs standardized on the 68040 platform because of its mature MMU and clean CISC architecture. The MC68EC040RC25A's 4 KB+4 KB separate instruction and data caches absorb interrupt-service-routine bursts in packet forwarding, and the 32-bit bus sustains line-rate 10 Mbps Ethernet forwarding without DMA stalls. The PGA package, while not RoHS, remains the preferred footprint for long-life telecom spares kept in service for 15-20 year horizons.
מומלץ
Laser Printer Engine Controller
Laser printer controllers traditionally pair a 68040-class MPU with dedicated raster image processors (RIPs). The MC68EC040RC25A's 25 MHz instruction throughput handles PCL and PostScript interpretation queues, while the on-chip caches keep font-cache lookups local. The 5 V supply and TTL bus integrate cleanly with the printer's existing 5 V power tree without level shifters, and the ceramic PGA withstands the high-temperature fuser-area thermal environment better than plastic parts.
מומלץ
Aerospace / Military Avionics (Legacy)
Long-life aerospace platforms (F-16 mission computers, early-civilian flight-management systems, helicopter mission planners) standardized on 68040 silicon. The MC68EC040RC25A's ceramic PGA, while lead-bearing, survives vibration and thermal shock that would crack plastic packages. For each MCN (modification of computer) retrofit, the 179-pin socket allows field replacement without desoldering. The MMU provides partitioned address-space isolation between flight-critical and mission-application software per DO-178C objectives.
מומלץ
Workstation-Class Compute Nodes (Retro / Hobbyist)
Retro-computing hobbyists build authentic Next-station, Amiga, or Atari TT-class machines around a real 68040. The MC68EC040RC25A matches the original 25 MHz Next-station and early Amiga 4000/040 specifications, including the original Macintosh IIci/Quadra 700 bus timings. Hobbyist operating systems like NetBSD/m68k run unmodified. Compared to FPGA soft-cores, the real silicon reproduces cycle-accurate interrupt behavior valued by retro software authors.
מומלץ
Scientific Data Acquisition Front-End
Laboratory instruments paired a 68040 MPU with high-resolution ADCs (e.g., the MAX197 or CS5531 family) for slow-but-precise data acquisition. The MC68EC040RC25A's 32-bit address bus maps the entire ADC register space linearly, while its deterministic interrupt latency suits timestamped streaming. Compared to a 32-bit MCU running at the same MHz, the 68040's superscalar dual-instruction-issue unit processes the ring-buffer housekeeping with fewer wait states. The 179-pin PGA package provides thermal headroom in continuous-operation laboratory racks.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור MC68EC040RC25A — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | MC68EC040RC25B | MC68EC040RC25 | MC68040RC25V | MC68EC040RC20A | MC68EC040RC33A |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 179-PGA | 179-PGA - same | 179-PGA - same | 179-PGA - same | 179-PGA - same | 179-PGA - same |
| Clock Frequency | 25 MHz | 25 MHz - identical | 25 MHz - identical | 25 MHz - identical | 20 MHz (-20%) | 33 MHz (+32%) |
| Data Bus Width | 32-Bit | 32-Bit | 32-Bit | 32-Bit | 32-Bit | 32-Bit |
| Address Bus Width | 32-Bit | 32-Bit | 32-Bit | 32-Bit | 32-Bit | 32-Bit |
| Instruction Cache | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB |
| Data Cache | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB | 4 KB |
| Integrated FPU | No (external MC68882 required) | No | No | Yes (integrated IEEE-754) | No | No |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V | 5 V | 5 V |
| RoHS Status | Non-Compliant | Non-Compliant | Non-Compliant | Non-Compliant | Non-Compliant | Non-Compliant |
מבדילים עיקריים
- Lower cost through FPU removal (לעומתMC68040RC25V)
- Improved AC characteristics over the pre-A mask (לעומתMC68EC040RC25 (original))
- Faster clock headroom available at the same footprint (לעומתMC68EC040RC33A)
הערות תכנון
Do not run software that issues FPU opcodes (F-line instructions) without an external MC68882 coprocessor - it will trap and crash the kernel. The 'EC' variant explicitly lacks the FPU. Verify by checking your toolchain's -msoft-float setting or by reviewing the binary for FPU instructions.
The 179-pin ceramic PGA operates as a through-hole part and requires a PGA179 socket; do not attempt to solder the PGA directly to a PCB because thermal-cycling stress will fracture ceramic packages. Use a high-quality socket from 3M, Yamaichi, or Mill-Max; the ZIF (zero-insertion-force) variants simplify bench testing and field replacements.
Estimated: at 25 MHz and 5 V with the integrated caches active, the MC68EC040RC25A dissipates approximately 2.5-3.0 W. Verify [DATA_NEEDED: precise power dissipation] from the manufacturer datasheet. Place decoupling capacitors (100 nF ceramic + 10 uF bulk) within 10 mm of every VCC/GND pin pair; the high-current switching of the 32-bit memory bus at 25 MHz demands low-inductance power delivery.
The 25 MHz external bus on the MC68EC040RC25A produces edges around 1-2 ns rise/fall time. Route address and data lines over a continuous ground plane with matched trace lengths and use a 4-layer or 6-layer PCB stackup. Series damping resistors (22-33 ohm) on heavily-loaded bus lines reduce ringing without violating the AC setup/hold window documented in the electrical characteristics.
Place the external clock oscillator and the reset/IRQ pull-up network within 25 mm of the MPU's clock and reset pins. The coprocessor interface lines (COPSC-, COPCLK, COPCD[0:3]) need controlled-impedance routing if an MC68882 is attached. Keep bus control signals separated from data/address groups to minimize cross-coupling.
מידע על תאימות
Contains lead (ceramic PGA package). RoHS non-compliant per distributor listing. Not AEC-Q100 qualified (this is a commercial-grade legacy MPU).
