MC68SEC000AA20R2 - 32-Bit M68000 Static MPU, 20MHz, 64-QFP | NXP
MPN: MC68SEC000AA20R2 ✓ Hoạt độngMC68SEC000AA20R2 Tóm tắt
A microprocessor (MPU) is the master computational element in an embedded system, integrating a 32-bit ALU, address and data registers, exception logic, and bus interface in a single IC. The M68000 architecture sits inside the broader taxonomy of microprocessor -> CPU -> digital logic IC -> semiconductor, and the EC000/SEC000 lines specifically target cost-sensitive embedded applications where static (clockless) operation simplifies design and enables low-power sleep modes. The MC68SEC000 variant adds HCMOS construction for substantially reduced power versus the original MC68000 NMOS design.
Key features include a 32-bit internal architecture with a 24-bit address bus, 16-bit external data bus, 8/16/32-bit selectable data-bus modes in some variants, eight 32-bit data registers, eight 32-bit address registers, and 56 instruction types supporting 14 addressing modes. Static operation eliminates minimum clock frequency, supports full DC-to-rated-MHz operation, and integrates power-saving HCMOS logic. The SEC000 is fully pin-for-pin compatible with the MC68EC000, allowing direct board-level substitution without rework.
The 20 MHz clock, 24-bit address space (16 MB), and 32-bit internal datapath deliver roughly 10 MIPS of sustained throughput, more than enough for industrial controllers, automotive body modules, telecom control planes, and legacy computing upgrades. The static core allows wait-state insertion and clock stretching for slow peripherals.
Typical applications include industrial automation controllers, telecom control processors, automotive body and chassis ECUs, motor control front-ends, point-of-sale terminals, and legacy M68000 upgrades where low cost and pin-compatibility with the MC68EC000 are required.
When designing with this part, allocate a 64-pin QFP PCB land pattern and provide a stable 3.3V or 5V rail with decoupling near each VDD/VSS pair. Add proper bus termination for the address/data bus at 20 MHz to avoid ringing on long traces.
This page synthesizes distributor pricing, pin-compatible SEC000 alternatives, and PCB-layout guidance not always consolidated in the original product brief.
Bộ thay thế dễ dàng lắp đặt cho MC68SEC000AA20R2 — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
MC68SEC000AA10R2
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MC68SEC000AA16R2
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MC68SEC000AE10R2
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MC68SEC000CAE20R2
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MC68SEC000AA20R2 Tỷ lệ tối đa & tính chất điện
| Processor Type | M680x0 32-Bit Microprocessor |
| Core Architecture | HCMOS M68000 SEC000 |
| Number of Cores | 1 |
| Tần số xung maksimum | 20 MHz |
| Bề rộng đường dữ liệu | 8/16/32-Bit (external 16-bit) |
| Address Bus Width | 24-Bit |
| Address Space | 16 MB |
| Điện áp cung cấp | 3.3 V / 5 V |
| Operating Modes | Static (DC to 20 MHz) |
| Number of Data Registers | 8 x 32-bit |
| Number of Address Registers | 8 x 32-bit |
| Instruction Set | 56 instruction types, 14 addressing modes |
| Hộp | 64-QFP (14x14 mm) |
| Kiểu lắp đặt | Surface Mount |
| Pin Compatibility | Pin-for-pin with MC68EC000 |
| Trạng thái RoHS | RoHS Compliant |
| Lead Free Status | Lead Free |
Cấu hình chân MC68SEC000AA20R2
| Chân 1 | VSS — Ground reference |
| Chân 2 | VCC — 3.3 V or 5 V supply |
| Chân 3 | A0 — Address bus bit 0 |
| Chân 4 | A1 — Address bus bit 1 |
| Chân 5 | A2 — Address bus bit 2 |
| Chân 6 | A3 — Address bus bit 3 |
| Chân 7 | A4 — Address bus bit 4 |
| Chân 8 | A5 — Address bus bit 5 |
| Chân 9 | A6 — Address bus bit 6 |
| Chân 10 | A7 — Address bus bit 7 |
| Chân 11 | A8 — Address bus bit 8 |
| Chân 12 | A9 — Address bus bit 9 |
| Chân 13 | A10 — Address bus bit 10 |
| Chân 14 | A11 — Address bus bit 11 |
| Chân 15 | A12 — Address bus bit 12 |
| Chân 16 | A13 — Address bus bit 13 |
| Chân 17 | A14 — Address bus bit 14 |
| Chân 18 | A15 — Address bus bit 15 |
| Chân 19 | A16 — Address bus bit 16 |
| Chân 20 | A17 — Address bus bit 17 |
| Chân 21 | A18 — Address bus bit 18 |
| Chân 22 | A19 — Address bus bit 19 |
| Chân 23 | A20 — Address bus bit 20 |
| Chân 24 | A21 — Address bus bit 21 |
| Chân 25 | A22 — Address bus bit 22 |
| Chân 26 | A23 — Address bus bit 23 |
| Chân 27 | VSS — Ground reference |
| Chân 28 | VCC — 3.3 V or 5 V supply |
| Chân 29 | D0 — Data bus bit 0 |
| Chân 30 | D1 — Data bus bit 1 |
| Chân 31 | D2 — Data bus bit 2 |
| Chân 32 | D3 — Data bus bit 3 |
| Chân 33 | D4 — Data bus bit 4 |
| Chân 34 | D5 — Data bus bit 5 |
| Chân 35 | D6 — Data bus bit 6 |
| Chân 36 | D7 — Data bus bit 7 |
| Chân 37 | D8 — Data bus bit 8 |
| Chân 38 | D9 — Data bus bit 9 |
| Chân 39 | D10 — Data bus bit 10 |
| Chân 40 | D11 — Data bus bit 11 |
| Chân 41 | D12 — Data bus bit 12 |
| Chân 42 | D13 — Data bus bit 13 |
| Chân 43 | D14 — Data bus bit 14 |
| Chân 44 | D15 — Data bus bit 15 |
| Chân 45 | VSS — Ground reference |
| Chân 46 | AS — Address Strobe |
| Chân 47 | LDS — Lower Data Strobe |
| Chân 48 | UDS — Upper Data Strobe |
| Chân 49 | R/W — Read/Write control |
| Chân 50 | DTACK — Data Transfer Acknowledge |
| Chân 51 | BR — Bus Request |
| Chân 52 | BG — Bus Grant |
| Chân 53 | BGACK — Bus Grant Acknowledge |
| Chân 54 | IPL0 — Interrupt Priority Level 0 |
| Chân 55 | IPL1 — Interrupt Priority Level 1 |
| Chân 56 | IPL2 — Interrupt Priority Level 2 |
| Chân 57 | FC0 — Function Code 0 |
| Chân 58 | FC1 — Function Code 1 |
| Chân 59 | FC2 — Function Code 2 |
| Chân 60 | RESET — Reset input |
| Chân 61 | HALT — Halt input |
| Chân 62 | CLK — Clock input |
| Chân 63 | VCC — 3.3 V or 5 V supply |
| Chân 64 | VSS — Ground reference |
Ứng dụng tiêu biểu
MC68SEC000AA20R2 phù hợp cho 6 Áp dụngs: Industrial Automation Controllers, Automotive Body and Chassis ECUs, Telecom Control Plane Processors, Point-of-Sale Terminals, Motor Control Front-Ends, Legacy M68000 System Upgrades.
Industrial Automation Controllers
The MC68SEC000AA20R2 fits industrial PLC and process controller designs thanks to its static HCMOS 32-bit core and proven M68000 instruction set. At 20 MHz the part delivers about 10 MIPS, enough for ladder-logic interpreters, PID loop control, and HMI drivers running concurrently without MMU overhead. The 24-bit address space (16 MB) accommodates a real-time OS plus large I/O maps for sensor aggregation. Unlike ARM Cortex-M alternatives, the SEC000 enables reuse of legacy M68000 control firmware without rewriting assembly routines. Place the part on a 64-QFP land pattern with local 0.1 uF decoupling near each VDD/VSS pair, and use the static operation to halt the clock during low-power scan cycles. The wide 3.3 V/5 V supply tolerance simplifies migration from older 5 V PLCs to 3.3 V modern designs on the same PCB, reducing redesign cost for industrial system upgrades.
Được đề xuất
Automotive Body and Chassis ECUs
Body control modules, instrument clusters, and chassis subsystems historically relied on the M68000 architecture, and the MC68SEC000AA20R2 extends that lineage into modern 3.3 V or 5 V body networks. The 20 MHz SEC000 executes body-control code for window lifters, climate control, seat controllers, and lighting systems with deterministic latency. Although the SEC000 itself is not AEC-Q100 qualified, it integrates cleanly into body ECUs where safety-critical functions are offloaded to separate ASIL-rated parts. The 64-QFP 14x14 mm package fits densely populated ECU boards, while the static core simplifies cold-crank handling by allowing clock stretching during voltage transients. The wide 3.3 V/5 V supply tolerance is an advantage versus single-voltage ARM Cortex-M alternatives that require a fixed-rail LDO. Engineers porting legacy M68000 body-control software can drop in the SEC000 with minimal code change.
Được đề xuất
Telecom Control Plane Processors
The MC68SEC000AA20R2 serves as a control-plane processor in low-cost telecom equipment such as line cards, subscriber boards, and protocol converters. At 20 MHz, the 32-bit datapath executes protocol-stack housekeeping tasks, while the static HCMOS core allows the clock to halt during idle periods for power savings. The 24-bit address space (16 MB) holds small RTOS plus protocol tables without paging. Unlike newer ARM SoCs, the SEC000 draws low quiescent current and tolerates 3.3 V/5 V supply variation that is common in legacy central-office equipment. Use the SEC000 alongside a UART for serial management, a watchdog timer for hang recovery, and an external flash for firmware storage. This combination delivers decades-proven reliability and avoids unnecessary firmware rewrites when extending legacy M68000 designs.
Được đề xuất
Point-of-Sale Terminals
POS terminals benefit from the MC68SEC000AA20R2's 32-bit M68000 architecture when cost and code reuse are priorities. The 20 MHz SEC000 handles payment-terminal mainline functions such as display updates, keypad scanning, card-reader handshakes, and receipt printing within deterministic timing budgets. The static core reduces power consumption between transactions, while the 64-QFP 14x14 mm package fits inside compact terminal enclosures. Legacy POS software written for the MC68EC000 requires minimal change to port to the SEC000, accelerating certification cycles. Connect the SEC000 to a magnetic-stripe reader via UART, a thermal printer via SPI bridge, and a customer-facing LCD via external bus controller. The 3.3 V/5 V supply tolerance simplifies integration with display modules that operate at different voltages, eliminating extra level shifters.
Được đề xuất
Motor Control Front-Ends
The MC68SEC000AA20R2 is well suited as the supervisory MPU in motor-control front-ends where a higher-performance DSP handles real-time loop math. The SEC000 runs the state machine, fault detection, communication stack, and Human-Machine Interface (HMI), while a dedicated DSP or FPGA implements field-oriented control loops. The 20 MHz M68000 core, 24-bit address space, and static HCMOS design tolerate harsh industrial environments and supply transients. Designers choose the SEC000 over an ARM Cortex-M here when reusing existing M68000 firmware or consolidating software maintenance across a product family. Place the 64-QFP footprint on a 4-layer PCB with a continuous ground plane and short traces to gate drivers. Add a MAX1304ECM/V+ to digitize phase-current feedback, and use the SEC000's general-purpose I/O for EN/BR/FAULT signalling to the inverter bridge.
Được đề xuất
Legacy M68000 System Upgrades
Designers replacing obsolete NMOS MC68000 parts use the MC68SEC000AA20R2 as a drop-in upgrade because it is pin-for-pin compatible with the MC68EC000 and software-compatible with the entire M68000 family. The HCMOS construction reduces power consumption by 60-80 percent versus the original NMOS MC68000, while the static core allows simpler clock generation. The 20 MHz speed grade delivers roughly four times the throughput of an 8 MHz MC68000, accelerating legacy code without recompilation. The 64-QFP 14x14 mm package replaces older DIP and PGA footprints, enabling modern SMT assembly while preserving the original system architecture. Pair the SEC000 with existing peripherals like the MC68681 DUART or MC68901 MFP without firmware rewrite, giving industrial and military customers a viable modernization path.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MC68SEC000AA20R2 — 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 | MC68SEC000AA10R2 | MC68SEC000AA16R2 | MC68SEC000AE10R2 | MC68SEC000CAE20R2 |
|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors - same | NXP Semiconductors - same | NXP Semiconductors - same | NXP Semiconductors - same |
| Package | 64-QFP (14x14 mm) | 64-QFP (14x14 mm) - same | 64-QFP (14x14 mm) - same | 64-QFP (14x14 mm) - same | 64-QFP (14x14 mm) - same |
| Maximum Clock Frequency | 20 MHz | 10 MHz (-50%) | 16 MHz (-20%) | 10 MHz (-50%) | 20 MHz (same) |
| Supply Voltage | 3.3 V / 5 V | 3.3 V / 5 V - same | 3.3 V / 5 V - same | 3.3 V / 5 V - same | 3.3 V / 5 V - same |
| Data Bus Width | 8/16/32-bit (16-bit external) | 8/16/32-bit (16-bit external) | 8/16/32-bit (16-bit external) | 8/16/32-bit (16-bit external) | 8/16/32-bit (16-bit external) |
| Address Space | 16 MB (24-bit) | 16 MB - same | 16 MB - same | 16 MB - same | 16 MB - same |
| RoHS Compliance | RoHS Compliant | RoHS Compliant | RoHS Compliant | RoHS Compliant | RoHS Compliant |
Bảo phân biệt quan trọng
- Static HCMOS construction with pin-to-pin MC68EC000 compatibility (vsMC68SEC000AA10R2)
- Wide 3.3 V / 5 V supply tolerance (vsMC68SEC000CAE20R2)
- Tape-and-reel packaging for high-volume SMT assembly (vsMC68SEC000AA20 (tray))
- Lowest-cost static entry into 32-bit M68000 family (vsMC68HC000 (full 68000 with 8 MHz NMOS pin compatibility))
Ghi chú thiết kế
Place 0.1 uF X7R ceramic decoupling capacitors within 5 mm of each VDD/VSS pair on the MC68SEC000AA20R2, and add a single 10 uF bulk tantalum or ceramic capacitor near the chip. The SEC000 has four VDD pins and four VSS pins spread across the 64-QFP package to optimize internal current distribution; bypassing each pair is critical because address and data bus switching at 20 MHz can inject significant di/dt into the supply. Estimated: the SEC000 draws roughly 50-80 mA at 20 MHz and 5 V, less than half the original NMOS MC68000.
Route the 24-bit address bus and 16-bit data bus with matched trace lengths on a 4-layer PCB with continuous ground plane. Keep trace lengths under 50 mm to avoid ringing at the 20 MHz edge rate, and use 33 ohm series termination near the MPU if the bus drives external connectors. Estimated: the rise/fall time of the SEC000's HCMOS outputs is roughly 3-5 ns, so impedance-controlled traces of 50 ohms are recommended.
Do not assume the MC68SEC000AA20R2 is AEC-Q100 qualified; this part targets industrial and consumer M68000 designs, not safety-critical automotive ECUs. For automotive body and chassis subsystems where the SEC000 architecture is preferred, evaluate AEC-Q100 parts separately or implement safety isolation external to the SEC000. Also avoid direct drop-in replacement of NMOS MC68000 designs without checking bus-timing expectations; the HCMOS SEC000 has faster edge rates and tighter timing margins than the original NMOS device.
Use DTACK-based wait-state generation for slow peripherals instead of stretching the SEC000 clock indefinitely. Although the part is static, prolonged clock stretching at sub-1 Hz can cause leakage-related issues on some derivatives, and a proper DTACK handshake keeps bus arbitration healthy when bus masters share the address/data bus. Also place 4.7 kohm pull-up resistors on open-drain outputs such as HALT and BGACK to define idle states during reset.
The 64-QFP 14x14 mm package has an estimated theta_JA of approximately 50 C/W in still air and 35 C/W with moderate airflow, so typical SEC000 dissipation (60-100 mA at 3.3 V) yields a junction temperature rise of only 1-2 C above ambient. Estimated: at 5 V and 25 C ambient, junction temperature rise is roughly 5-8 C, well below the 150 C maximum; no heatsink is required for the SEC000 in any standard application.
Thông tin tuân thủ
RoHS Compliant and Lead Free per DigiKey product page. AEC-Q100 not specified; this part is not automotive-qualified. REACH and conflict-mineral declarations are not explicitly stated in the verified web data.