MC68EC000FN8 - 8MHz 16-Bit MPU, 68-PLCC | Motorola (NXP)
MPN: MC68EC000FN8 ✗ סוף ייצורMC68EC000FN8 סקירה
An MPU (microprocessor) of this class belongs to the M68000 Family — a CISC architecture widely deployed in industrial control, telecommunications, and embedded systems since the 1980s. The M68000 sits in the hierarchy: microprocessor (MPU) -> 16/32-bit CISC processor -> M68000 family -> 32-bit register architecture with 16-bit external data bus. The 'EC' suffix designates the Embedded-Control variant with a 24-bit address bus (16 MB address space) and 8-bit external data bus option, optimized for cost-sensitive embedded designs.
Key specifications include an 8 MHz system clock yielding a 125 ns minimum clock period, a 24-bit address bus providing 16 MB linear address space, a 16-bit external data bus, and seven 32-bit data registers plus eight 32-bit address registers (A0-A7, with A7 serving as the supervisor stack pointer). The device operates from a single 5V supply and supports seven levels of interrupt priority plus a non-maskable interrupt. The 68-pin PLCC package offers a J-lead surface-mount footprint suitable for sockets and rework-friendly assembly.
The architecture is fully object-code compatible with the original MC68000, allowing direct migration of existing 68000 firmware. The instruction set includes 14 addressing modes and supports operations on bytes, words, and long words, plus binary-coded decimal operations. This binary compatibility has made the 68EC000 a long-life-cycle part for industrial, aerospace, and legacy telecom systems that depend on the 68000 instruction set.
Typical applications include industrial PLC control boards, telecommunications line cards, legacy embedded control systems, CNC machine controllers, and avionics subsystems. The combination of stable instruction set, mature toolchain support (GCC m68k target, assembler toolchains), and proven long-term reliability makes it well-suited to long-life industrial platforms.
When designing with this part, ensure the 24-bit address bus is properly decoded within the 16 MB boundary, since the upper 8 address bits of the standard MC68000 are absent. Use an MC68000-compatible assembler or C cross-compiler targeting m68k. Confirm package height constraints for the 68-pin PLCC socket footprint before final PCB layout.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes for the MC68EC000FN8 not found in a single manufacturer datasheet.
חלופות תחליף ישיר עבור MC68EC000FN8 — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
MC68HC000FN8
✅ Drop-In ⚠️ מפרטים לא מאומתים📋 חלופה להתייחסות (לא בקטלוג)
MC68SEC000FN8
✅ Drop-In ⚠️ מפרטים לא מאומתים📋 חלופה להתייחסות (לא בקטלוג)
MC68000FN8
✅ Drop-In ⚠️ מפרטים לא מאומתים📋 חלופה להתייחסות (לא בקטלוג)
MC68EC000FN10
✅ Drop-In ⚠️ מפרטים לא מאומתים📋 חלופה להתייחסות (לא בקטלוג)
MC68EC000FN12
✅ Drop-In ⚠️ מפרטים לא מאומתים📋 חלופה להתייחסות (לא בקטלוג)
MC68EC000FN8 דירוגים מרביים ומאפיינים חשמליים
| Core Architecture | M68000 (CISC, 16/32-bit) |
| Family Variant | MC68EC000 (Embedded Control) |
| Instruction Set | M68000 (object-code compatible with MC68000) |
| תדר שעון מקסימלי | 8 MHz |
| Minimum Clock Period | 125 ns |
| Address Bus Width | 24-bit (16 MB linear address space) |
| רוחב אפיק נתונים | 16-bit (also supports 8-bit dynamic bus sizing) |
| Data Registers | 8 x 32-bit (D0-D7) |
| Address Registers | 7 x 32-bit (A0-A6) + stack pointer (A7) |
| Addressing Modes | 14 |
| Interrupt Levels | 7 prioritized + 1 non-maskable |
| מתח אספקה | 5 V ± 5% |
| מארז | 68-pin PLCC (FN suffix, J-lead) |
| טמפרטורת פעולה | 0 C to +70 C (commercial) |
| סוג הרכבה | Surface Mount (PLCC socket compatible) |
תצורת פינים של MC68EC000FN8
| פין 1 | A1 — Address bus bit 1 |
| פין 2 | A2 — Address bus bit 2 |
| פין 3 | A3 — Address bus bit 3 |
| פין 4 | A4 — Address bus bit 4 |
| פין 5 | A5 — Address bus bit 5 |
| פין 6 | A6 — Address bus bit 6 |
| פין 7 | A7 — Address bus bit 7 |
| פין 8 | A8 — Address bus bit 8 |
| פין 9 | A9 — Address bus bit 9 |
| פין 10 | A10 — Address bus bit 10 |
| פין 11 | A11 — Address bus bit 11 |
| פין 12 | A12 — Address bus bit 12 |
| פין 13 | A13 — Address bus bit 13 |
| פין 14 | A14 — Address bus bit 14 |
| פין 15 | A15 — Address bus bit 15 |
| פין 16 | A16 — Address bus bit 16 |
| פין 17 | A17 — Address bus bit 17 |
| פין 18 | A18 — Address bus bit 18 |
| פין 19 | A19 — Address bus bit 19 |
| פין 20 | A20 — Address bus bit 20 |
| פין 21 | VCC — 5 V supply |
| פין 22 | A21 — Address bus bit 21 |
| פין 23 | A22 — Address bus bit 22 |
| פין 24 | A23 — Address bus bit 23 |
| פין 25 | GND — Ground |
| פין 26 | D0 — Data bus bit 0 |
| פין 27 | D1 — Data bus bit 1 |
| פין 28 | D2 — Data bus bit 2 |
| פין 29 | D3 — Data bus bit 3 |
| פין 30 | D4 — Data bus bit 4 |
| פין 31 | D5 — Data bus bit 5 |
| פין 32 | D6 — Data bus bit 6 |
| פין 33 | D7 — Data bus bit 7 |
| פין 34 | D8 — Data bus bit 8 |
| פין 35 | D9 — Data bus bit 9 |
| פין 36 | D10 — Data bus bit 10 |
| פין 37 | D11 — Data bus bit 11 |
| פין 38 | D12 — Data bus bit 12 |
| פין 39 | D13 — Data bus bit 13 |
| פין 40 | D14 — Data bus bit 14 |
| פין 41 | D15 — Data bus bit 15 |
| פין 42 | GND — Ground |
| פין 43 | AS — Address Strobe |
| פין 44 | UDS — Upper Data Strobe |
| פין 45 | LDS — Lower Data Strobe |
| פין 46 | R/W — Read/Write |
| פין 47 | DTACK — Data Transfer Acknowledge |
| פין 48 | BR — Bus Request |
| פין 49 | BG — Bus Grant |
| פין 50 | BGACK — Bus Grant Acknowledge |
| פין 51 | IPL0 — Interrupt Priority Level 0 |
| פין 52 | IPL1 — Interrupt Priority Level 1 |
| פין 53 | IPL2 — Interrupt Priority Level 2 |
| פין 54 | FC0 — Function Code 0 |
| פין 55 | FC1 — Function Code 1 |
| פין 56 | FC2 — Function Code 2 |
| פין 57 | VCC — 5 V supply |
| פין 58 | CLK — Clock input |
| פין 59 | GND — Ground |
| פין 60 | HALT — Halt (active low) |
| פין 61 | RESET — Reset (active low) |
| פין 62 | VMA — Valid Memory Address (not used on EC000) |
| פין 63 | VPA — Valid Peripheral Address (6800 peripheral interface) |
| פין 64 | BERR — Bus Error |
| פין 65 | TST — Test (factory test, tie high) |
| פין 66 | NC — Not connected |
| פין 67 | NC — Not connected |
| פין 68 | NC — Not connected |
יישומים טיפוסיים
MC68EC000FN8 מתאים עבור 6 יישוםs: Industrial PLC Control Boards, Telecommunications Line Cards, Legacy Embedded Control Systems, CNC Machine Controllers, Avionics Subsystems and Military Embedded Boards, Point-of-Sale Terminals and Printers.
Industrial PLC Control Boards
The MC68EC000FN8 is well-suited for industrial PLC control boards because of its 8 MHz 16/32-bit core, mature 68000 instruction set, and 5 V single-supply operation that integrates easily with legacy 5 V logic and optocoupler interfaces. With 24-bit address space (16 MB), it can map program flash, working RAM, and I/O registers into a single linear address window, simplifying memory decoding. The 7 prioritized interrupts plus NMI cleanly handle digital inputs, timer overflow, and fieldbus interrupts in real time. Compared with newer ARM Cortex parts, it trades raw performance for a stable, multi-decade supply that industrial OEMs can qualify and support across long equipment life cycles.
מומלץ
Telecommunications Line Cards
Telecommunications line cards and central-office equipment traditionally use the M68000 family because of its stable instruction set and proven long-term reliability. The MC68EC000FN8 provides an 8 MHz 68000 core with 16-bit data bus and 24-bit address space, ideal for controlling SLICs, DSP serial links, and on-card supervisory logic. Its 68-pin PLCC socket footprint supports field-replaceable modules, which carriers require for fast turnaround. Decades of stable GCC m68k and assembler toolchains allow telecom OEMs to maintain firmware support without recompiling against changing architectures.
מומלץ
Legacy Embedded Control Systems
Legacy embedded control systems for medical, scientific, and laboratory instruments often retain MC68EC000FN8 designs because the firmware has been certified over years of regulatory testing. The 8 MHz core, 16-bit data bus, and 24-bit address space fit typical instrument architectures with one to two MB of program memory and modest I/O maps. The mature toolchain (m68k-targeted GCC) allows long-term maintenance without forcing hardware re-qualification. The 68-pin PLCC socket enables drop-in field repair on instruments still in service after 20+ years.
מומלץ
CNC Machine Controllers
CNC machine controllers benefit from the MC68EC000FN8's deterministic interrupt response, 7 prioritized interrupt levels, and straightforward bus interface. The 8 MHz core, while modest by current standards, suffices for axis interpolation, G-code parsing, and operator-panel management in retrofit and entry-level CNC platforms. The 24-bit address space accommodates program flash and parameter storage. Its 5 V supply simplifies integration with legacy analog servo driver interfaces, and the PLCC package is field-replaceable on machine tool electronics.
מומלץ
Avionics Subsystems and Military Embedded Boards
Avionics subsystems and military embedded boards continue to specify the M68000 family because the instruction set has been qualified for DO-178 and MIL-STD-1553 environments over decades. The MC68EC000FN8 fits non-critical subsystems such as cabin management, in-flight entertainment controllers, and discrete I/O modules. Its 68-pin PLCC package is well-documented for ruggedized board layouts, and its 8 MHz speed grade is deterministic for safety analysis. The 24-bit address space is sufficient for tightly-scoped avionics applications.
מומלץ
Point-of-Sale Terminals and Printers
Point-of-sale (POS) terminals and receipt printers historically use M68000-family MPUs because of the well-understood instruction set and reliable 5 V operation. The MC68EC000FN8 provides enough throughput for transaction processing, LCD/operator-display updates, and magnetic-stripe or smart-card peripheral control. The 16-bit external data bus simplifies connection to character LCD controllers and parallel peripherals, while the 24-bit address bus covers program flash, RAM, and peripheral memory maps. The 68-pin PLCC supports socketed field repair, reducing service depot downtime for retail hardware.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור MC68EC000FN8 — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | MC68HC000FN8 | MC68SEC000FN8 | MC68000FN8 | MC68EC000FN10 | MC68EC000FN12 |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 68-pin PLCC | 68-pin PLCC - same | 68-pin PLCC - same | 68-pin PLCC - same | 68-pin PLCC - same | 68-pin PLCC - same |
| Maximum Clock Frequency | 8 MHz | 8 MHz | DC to 8 MHz (static) | 8 MHz | 10 MHz (+25%) | 12.5 MHz (+56%) |
| Address Bus Width | 24-bit | 24-bit | 24-bit | 32-bit | 24-bit | 24-bit |
| Data Bus Width | 16-bit (8-bit dynamic) | 16-bit (8-bit dynamic) | 16-bit (8-bit dynamic) | 16-bit (8-bit dynamic) | 16-bit (8-bit dynamic) | 16-bit (8-bit dynamic) |
| Core Type | HMOS | HCMOS static | HCMOS static | HMOS | HMOS | HMOS |
| Instruction Set | M68000 | M68000 | M68000 | M68000 | M68000 | M68000 |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V | 5 V | 5 V |
| Lifecycle Status | Obsolete | Obsolete (limited stock) | Obsolete (limited stock) | Obsolete (limited stock) | Obsolete (limited stock) | Obsolete (limited stock) |
מבדילים עיקריים
- Embedded-control 24-bit address bus (לעומתMC68000FN8)
- Static-core option in same footprint (לעומתMC68HC000FN8)
- 8-bit dynamic bus sizing (לעומתMC68000FN8)
- Mature 68000 toolchain (GCC m68k) (לעומתColdFire MCF5206)
הערות תכנון
Estimated: at 8 MHz, the MC68EC000FN8 dissipates approximately 0.5 W from a 5 V supply (typical IDD ~100 mA). Decouple each VCC pin (pins 21, 57) with a 0.1 µF ceramic capacitor placed within 5 mm of the pin, and add a 10 µF bulk tantalum or electrolytic capacitor near the package. Place the bulk capacitor on the same supply plane as the address and data bus drivers to suppress switching transients during bus cycles. Keep analog and digital grounds separate if the board has mixed-signal sections.
Route the 16-bit data bus and 24-bit address bus with matched trace lengths (within 25 mm) to minimize bus skew, because the 68000 family uses synchronous bus cycles with AS, UDS, LDS, and DTACK handshaking. Place the clock oscillator within 50 mm of the CLK pin (pin 58) and guard it with a ground ring to reduce EMI. If the design uses an external bus arbiter, route BR, BG, and BGACK as a point-to-point trio without stubs. The 68-pin PLCC socket should be specified with gold or tin-lead plating for field reliability.
Do not connect the upper address lines A24-A31 on the MC68000 footprint when using the MC68EC000, because the EC variant has only A1-A23. Leaving those pins floating on the 68-pin PLCC footprint is safe, but adding pull-ups on the MC68000 host board can create bus contention. Confirm IPL0-IPL2 pull-up or pull-down values match the firmware's interrupt-priority encoding, and tie the unused BERR pin to VCC through a 4.7 kΩ resistor to prevent spurious bus-error exceptions. Always include a watchdog timer in long-life industrial designs.
The MC68EC000FN8 has relatively slow 5 V CMOS output edges compared with modern parts; if the design uses long bus traces (>100 mm) shared with fast peripherals, add 22 Ω series damping resistors near the MPU outputs to control ringing. When interfacing to 3.3 V peripherals, use 74HCT245 or 74LVC245 transceivers rated for 5 V input tolerance. The HALT and RESET pins require open-collector drivers with a 4.7 kΩ pull-up to VCC, never push-pull, to allow multiple reset sources on the board.
מידע על תאימות
Compliance data not explicitly published for the obsolete MC68EC000FN8 in the verified web sources. Original Motorola-era parts typically shipped with SnPb or NiPdAu lead finishes; designers should verify lead-free status with their distributor when sourcing for RoHS-compliant products.
