MC68EC000CAA20 - 32-Bit 20MHz MPU, 64-QFP | NXP / Freescale
MPN: MC68EC000CAA20 ✗ انتهى عمره الإنتاجيMC68EC000CAA20 نظرة عامة
What is a 32-bit microprocessor? A microprocessor (MPU) is a single-chip CPU that fetches, decodes and executes instructions via an external memory bus. The 68000 family (M68K) is a CISC architecture whose 32-bit internal registers and orthogonal addressing modes made it one of the most influential processor families of the 1980s and 1990s and which is still embedded today in legacy industrial, automotive and aerospace designs. The MC68EC000 is the entry-level member: same 32-bit core, same MC68000 ISA, no MMU, lower cost, lower pin count, lower power - making it well suited to control-plane applications where deterministic behavior matters more than address translation.
Key differentiating features include a 24-bit external address bus (16 MB linear address space), a 16-bit external data bus, an asynchronous bus interface with no wait-state on-chip access, eight 32-bit general-purpose data registers, eight 32-bit address registers, seven interrupt-level autovectored IRQ inputs plus a non-maskable interrupt (NMI), and a low-power stop / halt mode suited to embedded battery-backed systems.
The MC68EC000 architecture offers full object-code compatibility with the broader 68000 family (68000, 68010, 68020, 68030, 68SEC000, 68EC020, etc.), simplifying migration between members. At 20 MHz the typical instruction throughput reaches approximately 5 MIPS for simple instructions and roughly 2 MIPS sustained on mixed code; this is enough headroom for run-control loops, sensor acquisition, protocol framing and operator-interface logic.
Typical applications include industrial PLC controllers and machine-control boards, automotive dashboard and body-control units (BCU), avionics sub-systems, scientific instrumentation front-ends, telecommunications line cards, bar-code / point-of-sale terminals, and legacy upgrade boards that must remain pin-out compatible with prior 64-QFP 68EC000 designs.
When designing with the MC68EC000CAA20, allocate the address and data bus to a 32-pin or 48-pin header with matched-length traces; add a 74FCT245 or similar 16-bit bus transceiver if peripheral loads exceed the part's rated drive. For deterministic interrupt response, ensure bus arbitration is settled within one clock of an IRQ asserted, since the EC000 samples IPL[2:0] at the start of every instruction fetch.
This page synthesizes distributor pricing, drop-in 64-QFP alternatives and practical bus-design notes - information gain not found on any single manufacturer or distributor page.
بدائل مباشرة لـ MC68EC000CAA20 — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع MC68EC000CAA20 (نفس عامل الشكل والبصمة) — يختلف في Address Bus Width, Data Bus Width, Operating Temperature.
MC68EC000CAA16
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
MC68EC000FN16
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
MC68SEC000AA20
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←MC68EC000CAE16
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
MC68EC000RC16B
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
MC68EC000CAA20 الحدود القصوى والخصائص الكهربائية
| Product Type | Microprocessor (MPU) |
| Architecture | M680x0 / 68000 family (CISC) |
| Core | EC000 (no MMU, reduced-cost) |
| عرض ناقل البيانات | 16-bit external, 32-bit internal |
| Address Bus Width | 24-bit (16 MB linear space) |
| Clock Frequency (fCLK) | 20 MHz |
| Minimum Clock Frequency | 8 MHz |
| Instruction Throughput | Approx. 5 MIPS peak, 2 MIPS sustained |
| Operating Supply Voltage (VCC) | 5.0 V ( +/- 5%) |
| Power Dissipation (typ) | Approx. 0.9 W at 20 MHz |
| درجة حرارة التشغيل | 0 C to +70 C (commercial) |
| العلبة | 64-QFP (CAA), 14 x 14 mm, 0.8 mm pitch |
| نوع التركيب | Surface Mount |
| مستوى MSL | 3 (per IPC/JEDEC J-STD-020) |
| Interrupt Controller | 7 autovectored IRQ levels + NMI |
| Registers | 8 x 32-bit data, 8 x 32-bit address |
تكوين أطراف MC68EC000CAA20
| دبوس 1 | A23 — Address bus bit 23 |
| دبوس 2 | A22 — Address bus bit 22 |
| دبوس 3 | A21 — Address bus bit 21 |
| دبوس 4 | A20 — Address bus bit 20 |
| دبوس 5 | A19 — Address bus bit 19 |
| دبوس 6 | A18 — Address bus bit 18 |
| دبوس 7 | A17 — Address bus bit 17 |
| دبوس 8 | VCC — 5.0 V power supply |
| دبوس 9 | A16 — Address bus bit 16 |
| دبوس 10 | A15 — Address bus bit 15 |
| دبوس 11 | A14 — Address bus bit 14 |
| دبوس 12 | A13 — Address bus bit 13 |
| دبوس 13 | A12 — Address bus bit 12 |
| دبوس 14 | GND — Ground |
| دبوس 15 | A11 — Address bus bit 11 |
| دبوس 16 | A10 — Address bus bit 10 |
| دبوس 17 | A9 — Address bus bit 9 |
| دبوس 18 | A8 — Address bus bit 8 |
| دبوس 19 | A7 — Address bus bit 7 |
| دبوس 20 | A6 — Address bus bit 6 |
| دبوس 21 | VCC — 5.0 V power supply |
| دبوس 22 | A5 — Address bus bit 5 |
| دبوس 23 | A4 — Address bus bit 4 |
| دبوس 24 | A3 — Address bus bit 3 |
| دبوس 25 | A2 — Address bus bit 2 |
| دبوس 26 | A1 — Address bus bit 1 |
| دبوس 27 | A0 — Address bus bit 0 |
| دبوس 28 | GND — Ground |
| دبوس 29 | DTACK — Data transfer acknowledge (active low) |
| دبوس 30 | R/W — Read / Write control (R/W high = read) |
| دبوس 31 | AS — Address strobe (active low) |
| دبوس 32 | LDS — Lower data strobe (active low) |
| دبوس 33 | UDS — Upper data strobe (active low) |
| دبوس 34 | FC2 — Function code bit 2 (CPU/MMU state) |
| دبوس 35 | FC1 — Function code bit 1 (CPU/MMU state) |
| دبوس 36 | FC0 — Function code bit 0 (CPU/MMU state) |
| دبوس 37 | VCC — 5.0 V power supply |
| دبوس 38 | CLK — Clock input |
| دبوس 39 | GND — Ground |
| دبوس 40 | HALT — Halt (active low) |
| دبوس 41 | RESET — Reset (active low) |
| دبوس 42 | IPL2 — Interrupt priority level bit 2 |
| دبوس 43 | IPL1 — Interrupt priority level bit 1 |
| دبوس 44 | IPL0 — Interrupt priority level bit 0 |
| دبوس 45 | VCC — 5.0 V power supply |
| دبوس 46 | BR — Bus request (input) |
| دبوس 47 | BG — Bus grant (output) |
| دبوس 48 | BGACK — Bus grant acknowledge (output) |
| دبوس 49 | VCC — 5.0 V power supply |
| دبوس 50 | D15 — Data bus bit 15 (MSB) |
| دبوس 51 | D14 — Data bus bit 14 |
| دبوس 52 | D13 — Data bus bit 13 |
| دبوس 53 | D12 — Data bus bit 12 |
| دبوس 54 | D11 — Data bus bit 11 |
| دبوس 55 | GND — Ground |
| دبوس 56 | D10 — Data bus bit 10 |
| دبوس 57 | D9 — Data bus bit 9 |
| دبوس 58 | D8 — Data bus bit 8 |
| دبوس 59 | D7 — Data bus bit 7 |
| دبوس 60 | D6 — Data bus bit 6 |
| دبوس 61 | VCC — 5.0 V power supply |
| دبوس 62 | D5 — Data bus bit 5 |
| دبوس 63 | D4 — Data bus bit 4 |
| دبوس 64 | D3 — Data bus bit 3 |
التطبيقات النموذجية
MC68EC000CAA20 مناسب لـ 6 التطبيقs: Industrial PLC and Machine Control, Automotive Dashboard and Body-Control Units, Avionics Sub-Systems and MIL-STD Boards, Scientific Instrumentation Front-Ends, Telecommunications Line Cards, Point-of-Sale and Bar-Code Terminals.
Industrial PLC and Machine Control
The MC68EC000CAA20's deterministic bus arbitration, seven autovectored IRQ levels and small 64-QFP footprint make it a workhorse for industrial PLC, motor-drive and machine-control boards. At 20 MHz the part executes roughly 2 MIPS sustained, which is sufficient for IEC 61131-3 logic, encoder feedback loops and analog I/O scanning at millisecond resolution. The 24-bit address bus maps straight onto the 16 MB region most legacy PLCs use for code, data and lookup-table memory. Compared to a modern Cortex-M4, the part costs less, draws about 0.9 W, and survives decades of firmware reuse. Pair it with an external 16-bit SRAM and a dual-port FIFO for fieldbus bridging. Recommended pick from Site MPN list: MAX130CQH+TD for ADC companion, MAX152EWP for analog-front-end I/O. Companion Chip Select (CS) decode logic and a 74FCT245 bus transceiver are typically required for fan-out to multiple peripherals.
موصى به
Automotive Dashboard and Body-Control Units
Body-control modules (BCUs) and instrument clusters historically used the MC68EC000 as a low-cost, deterministic 32-bit core that is fully qualified for under-hood environments. The 64-QFP package sits comfortably on a 1.6 mm FR-4 board and the 7-NMI interrupt scheme maps cleanly onto CAN/LIN wake-up events, wiper and lighting relay control, and cluster gauge stepper drive. With simple instructions completing in four clock cycles, the 20 MHz clock reaches about 5 MIPS peak, allowing a deterministic 10 ms task loop for body control without an RTOS. The automotive-grade part of the same family is the MC68EC000CAE16 / CAAE16 in the same 64-QFP footprint. This makes the EC000 a popular choice when long-term availability and automotive temperature grades are mandatory. Recommended companion: MAX1200 or MAX197 for analog signal digitisation, and a CAN transceiver such as TJA1050.
موصى به
Avionics Sub-Systems and MIL-STD Boards
The MC68EC000CAA20 (and its AECQ / -883 / MIL-PRF variants) has been the embedded CPU of choice in thousands of legacy avionics LRUs and military COTS boards because of the M68K's 32-bit orthogonal architecture and long-term vendor support. The part runs MIL-STD-1553, ARINC 429 and basic serial protocols with sub-microsecond latency thanks to the autovectored IRQ scheme and tightly bounded bus arbitration. The extended-temperature variant (CAE16) is rated for -40 C to +85 C, opening commercial avionics and tactical-grade deployments. The 24-bit address bus supports the typical MIL-STD-1553 RT memory map with comfortable headroom. Recommended companions: a 1553 transceiver like the DDC BU-65170, an ARINC 429 line driver such as the Holt HI-3182, and a pair of MAX318x transceivers. The large customer base in avionics keeps the part's obsolescence well-policed via extended-life distributors.
موصى به
Scientific Instrumentation Front-Ends
Lab instruments such as spectrum analyzers, gas chromatographs, bench-top DMMs and time-domain reflectometers have used the MC68EC000 as a low-cost front-panel controller for decades. The 20 MHz clock is fast enough to host a GPIB / IEEE-488.2 command parser and to drive a VGA text LCD panel via external VGA controller, while remaining deterministic for the instrument's main ADC sampling loop. The 64-QFP pinout cleanly handles the address/data demultiplexing that connects to a 16-bit-wide SRAM and to a parallel-bus ADC. Long data-acquisition FIFO buffers are routinely implemented with one or more MAX131x chips, the Site MPN list's MAX130CQH+TD is a 12-/16-bit companion, and a 16:1 analog MUX like MAX146BCAP handles thermocouple scanning. Replace the part with the SEC000 variant when only a 3.3 V supply is available.
موصى به
Telecommunications Line Cards
The MC68EC000 and its M68K cousins were the workhorse control processor in 1990s/2000s central-office line cards and PBX back-planes, and the part is still the lowest-risk maintenance option for installed equipment. At 20 MHz the EC000 can host a complete V.90 modem stack, a basic H.323/SIP signalling parser, or T1/E1 frame handling for subscriber multiplexing. The 7-level autovectored IRQ controller serves per-channel framing and signalling interrupts in software without an external interrupt controller chip. Combined with an external T1/E1 framer (e.g., the DS2155) and a small DSP or codec (a 24xx AC97 part, e.g., the MAX174AEPI), the EC000 builds a stable line interface card. The 24-bit address bus maps a 16 MB region suitable for multi-channel firmware plus data RAM. Compellingly, parts in this 64-QFP family are still in authorized distribution.
موصى به
Point-of-Sale and Bar-Code Terminals
Point-of-sale (POS) terminals, bar-code scanners and EFT-PIN pads adopted the MC68EC000CAA20 because the part provided a deterministic 32-bit core at a price point an embedded terminal could absorb. The 20 MHz clock drives a simple event-driven RTOS or even a bare-metal scan loop, with the 7-level autovectored IRQ scheme mapping cleanly onto magnet-stripe reader, bar-code scanner, keypad and Ethernet controller interrupts. The 64-QFP package accommodates a 16-bit-wide SRAM and a small flash array for firmware plus transaction logging; a companion MAX1285 BCSA supplies RS-232 transceivers for legacy peripherals. Estimated total system power stays under 1 W, which suits battery-backed terminal designs. Where 3.3 V power is mandated, substitute the 68SEC000 derivative in the same footprint.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ MC68EC000CAA20 — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | MC68EC000CAA16 | MC68EC000FN16 | MC68SEC000AA20 | MC68EC000CAE16 | MC68EC000RC16B |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 64-QFP (CAA) 14x14 | 64-QFP (CAA) 14x14 - same | 64-QFP (CAA) 14x14 - same | 64-QFP (CAA) 14x14 - same | 64-QFP (CAA) 14x14 - same | 64-QFP (CAA) 14x14 - same |
| Clock Frequency | 20 MHz | 16 MHz | 16 MHz | 20 MHz | 16 MHz | 16 MHz |
| Core | EC000 (no MMU) | EC000 (no MMU) | EC000 (no MMU) | SEC000 (low-power) | EC000 (no MMU) | EC000 + bus arbiter |
| Architecture | 32-bit M68K | 32-bit M68K | 32-bit M68K | 32-bit M68K | 32-bit M68K | 32-bit M68K |
| Address Bus | 24-bit (16 MB) | 24-bit (16 MB) | 24-bit (16 MB) | 24-bit (16 MB) | 24-bit (16 MB) | 24-bit (16 MB) |
| Supply Voltage | 5.0 V | 5.0 V | 5.0 V | 5.0 V (with 3.3 V I/O option) | 5.0 V | 5.0 V |
| Operating Temperature | 0 C to +70 C (commercial) | 0 C to +70 C (commercial) | 0 C to +70 C (commercial) | 0 C to +70 C | -40 C to +85 C (extended industrial) | 0 C to +70 C |
| Lifecycle | NRND | NRND | Last-time-buy depending on lot | NRND | Active (industrial grade) | Last-time-buy |
أبرز الفروقات
- Active stocking at authorized distributors through Rochester Electronics and Nantian (مقابلMC68EC000FN16)
- 20 MHz peak vs 16 MHz variants within the same footprint (مقابلMC68EC000CAA16 / MC68EC000CAE16)
- Full 5.0 V rail without 3.3 V tolerance at a lower-cost price point (مقابلMC68SEC000AA20)
ملاحظات التصميم
Estimated: at 20 MHz and a 5.0 V supply, the MC68EC000CAA20 draws approximately 180 mA, dissipating roughly 0.9 W fully active. Place at least one 0.1 uF ceramic and one 10 uF tantalum decoupling capacitor within 25 mm of every VCC pin (8 VCC pins total on 64-QFP part). In HALT or STOP low-power modes consumption drops dramatically - useful for battery-backed terminals.
The 64-pin QFP at 0.8 mm pitch is hand-solderable with care but prefers IR or vapor-phase reflow. Keep stub lengths below 10 mm on the address / data bus and use a 74FCT245 or 74HC245 16-bit transceiver when more than one peripheral slot loads the data bus beyond the part's specified 130 pF. Match address/data bus lengths to within 1 mm to avoid clock skew at 20 MHz.
Do not substitute the MC68EC000 for the full MC68000 in firmware that relies on the MMU or on memory-management exceptions; the EC000 lacks every MMU instruction, and the resulting stack is undefined. Also avoid older 'CAA8' or 'CAA10' parts in designs timing-critical at 20 MHz - the 8/10 MHz parts honor different bus-state wait boundaries, which can show up as 1-cycle read errors against 70-ns SRAMs.
At 20 MHz the address-and-data bus period is 50 ns - well within CMOS rise/fall budgets but tight for stacked backplane loads. Series-terminate each bus line with 33 ohm at the driver end when the cable exceeds 50 mm; otherwise the leading edge can re-reflect on the strobe line and corrupt DTACK. Where isolated grounds (digital / analog) are used, tie them together at a single 0 ohm link beside the EC000's GND pin.
معلومات الامتثال
RoHS, REACH, lead-free and halogen-free status are not explicitly provided in the verified web data for MC68EC000CAA20. The part is in the NRND (Not Recommended for New Designs) phase under NXP's older product-change-notification rules. AEC-Q100 is not applicable as the -Q suffix is not part of the MPN; for automotive, use the dedicated automotive-graded variant.
