MC68SEC000AA20 - 32-bit M68k MPU 20MHz 64-QFP | NXP / Freescale
N.º da peça: MC68SEC000AA20 ✗ Fim de vida| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $24.5 | $24,50 |
| 10 | $21.75 | $217,50 |
| 100 | $18.95 | $1.895,00 |
| 500 | $16.4 | $8.200,00 |
| 1.000 | $14.85 | $14.850,00 |
MC68SEC000AA20 Visão geral
An M68k microprocessor (often called 68000 or 68k) is a CISC 32-bit processor with a 16-bit external data bus, popular in early Apple Macintosh computers, Atari ST, Sega Genesis, Amiga, and countless embedded systems. The M68k family sits in the hierarchy as: MPU -> microprocessor -> processor IC -> semiconductor. Within the M68k lineage, the SEC000 variant is the static, low-power CMOS variant of the original NMOS MC68000, and is itself an evolution of the MC68EC000.
Key features of the MC68SEC000AA20 include full static operation (clock can be stopped), 16-bit external data bus with 24-bit address bus, eight 32-bit data registers and eight 32-bit address registers, seven user-visible addressing modes, and 14 addressing modes total, plus supervisor/user privilege levels with a separate stack pointer. Static design enables ultra-low-power standby, ideal for battery-backed industrial controllers and instrumentation.
The architecture uses a microcoded CISC pipeline that executes every 68k instruction set natively. Two supervisor stack pointers (SSP/USP) and two operating modes are provided. The device supports a synchronous bus for direct interface to peripherals, and asynchronous bus for compatibility with older 68k designs. The 20 MHz version delivers approximately 5 MIPS sustained throughput.
Typical applications include industrial control, embedded instrumentation, legacy 68k system maintenance and refurbishment, point-of-sale terminals, telecom line cards, and aerospace systems where the mature 68k toolchain is mandated. It is also used to extend the lifecycle of older designs where a pin-compatible static part replaces an older dynamic MC68000 or MC68EC000.
A key design consideration when migrating to the SEC000 is verifying timing compatibility: the static core allows the clock to be slowed or stopped entirely for power saving, but any wait-state insertion logic and bus arbitration timing must still match the EC000 reference. The 64-QFP footprint is compatible with the original MC68EC000 64-pin QFP, but the PGA versions (e.g. MC68HC000RC12) are NOT pin-compatible.
This page synthesizes distributor pricing, lifecycle status from NXP, drop-in alternatives from the same M68k family, and practical design notes not aggregated in any single manufacturer publication.
Alternativas drop-in para MC68SEC000AA20 — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com MC68SEC000AA20 (mesmo formato e footprint) — diferindo em Address Bus Width, Data Bus Width, Core, Core Architecture, Maximum Clock Frequency.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
MC68SEC000AA10
✅ Drop-In✓ Em estoque
$6.4 / unidade
Ver ficha técnica →MC68EC000AA20
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MC68EC000AA16
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MC68HC000RC10
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
MCF51AC256AVFUE
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MC68SEC000AA20 Classificações máximas e características elétricas
| Processor Type | M680x0 (M68k) 32-bit MPU |
| Core Architecture | M68k EC000/SEC000 static core |
| Number of Cores | 1 |
| Largura do barramento de dados | 16-bit external |
| Address Bus Width | 24-bit |
| Internal Architecture | 32-bit |
| Frequência máxima de clock | 20 MHz |
| Operating Voltage | 3.3 V to 5 V |
| Temperatura de operação | 0C to +70C |
| Encapsulamento / Caixa | 64-QFP (14x14 mm) |
| Tipo de montagem | Surface Mount |
| Static Operation | Yes (clock can be stopped) |
| Status RoHS | RoHS Compliant |
| Lead Free Status | Lead Free |
| Status do ciclo de vida | End of Life (per NXP product page) |
Configuração de pinos do MC68SEC000AA20
| Pino 1 | VCC — +5V power supply |
| Pino 2 | D0 — Data bus bit 0 (LSB) |
| Pino 3 | D1 — Data bus bit 1 |
| Pino 4 | D2 — Data bus bit 2 |
| Pino 5 | D3 — Data bus bit 3 |
| Pino 6 | D4 — Data bus bit 4 |
| Pino 7 | D5 — Data bus bit 5 |
| Pino 8 | D6 — Data bus bit 6 |
| Pino 9 | D7 — Data bus bit 7 |
| Pino 10 | D8 — Data bus bit 8 |
| Pino 11 | D9 — Data bus bit 9 |
| Pino 12 | D10 — Data bus bit 10 |
| Pino 13 | D11 — Data bus bit 11 |
| Pino 14 | D12 — Data bus bit 12 |
| Pino 15 | D13 — Data bus bit 13 |
| Pino 16 | D14 — Data bus bit 14 |
| Pino 17 | D15 — Data bus bit 15 (MSB) |
| Pino 18 | GND — Ground |
| Pino 19 | A1 — Address bus bit 1 |
| Pino 20 | A2 — Address bus bit 2 |
| Pino 21 | A3 — Address bus bit 3 |
| Pino 22 | A4 — Address bus bit 4 |
| Pino 23 | A5 — Address bus bit 5 |
| Pino 24 | A6 — Address bus bit 6 |
| Pino 25 | A7 — Address bus bit 7 |
| Pino 26 | A8 — Address bus bit 8 |
| Pino 27 | A9 — Address bus bit 9 |
| Pino 28 | A10 — Address bus bit 10 |
| Pino 29 | A11 — Address bus bit 11 |
| Pino 30 | A12 — Address bus bit 12 |
| Pino 31 | A13 — Address bus bit 13 |
| Pino 32 | A14 — Address bus bit 14 |
| Pino 33 | A15 — Address bus bit 15 |
| Pino 34 | GND — Ground |
| Pino 35 | A16 — Address bus bit 16 |
| Pino 36 | A17 — Address bus bit 17 |
| Pino 37 | A18 — Address bus bit 18 |
| Pino 38 | A19 — Address bus bit 19 |
| Pino 39 | A20 — Address bus bit 20 |
| Pino 40 | A21 — Address bus bit 21 |
| Pino 41 | A22 — Address bus bit 22 |
| Pino 42 | A23 — Address bus bit 23 (MSB) |
| Pino 43 | GND — Ground |
| Pino 44 | IPL0 — Interrupt Priority Level 0 |
| Pino 45 | IPL1 — Interrupt Priority Level 1 |
| Pino 46 | IPL2 — Interrupt Priority Level 2 |
| Pino 47 | FC0 — Function Code output bit 0 |
| Pino 48 | FC1 — Function Code output bit 1 |
| Pino 49 | FC2 — Function Code output bit 2 |
| Pino 50 | R/W — Read/Write control signal |
| Pino 51 | AS — Address Strobe |
| Pino 52 | DS — Data Strobe (active low) |
| Pino 53 | LDS — Lower Data Strobe (active low) |
| Pino 54 | UDS — Upper Data Strobe (active low) |
| Pino 55 | DTACK — Data Transfer Acknowledge (active low) |
| Pino 56 | BR — Bus Request (active low) |
| Pino 57 | BG — Bus Grant (active low) |
| Pino 58 | BGACK — Bus Grant Acknowledge (active low) |
| Pino 59 | RESET — Reset input (active low) |
| Pino 60 | HALT — Halt (active low) |
| Pino 61 | CLK — Clock input |
| Pino 62 | VCC — +5V power supply |
| Pino 63 | VCC — +5V power supply |
| Pino 64 | VCC — +5V power supply |
Aplicações típicas
MC68SEC000AA20 é adequado para 7 aplicaçãos: Industrial Control and Automation, Legacy Embedded Instrumentation Maintenance, Point-of-Sale (POS) Terminals, Telecom Line Cards and Switches, Aerospace and Avionics (Legacy Systems), Music Synthesizers and Audio Equipment, Medical Device Embedded Controllers.
Industrial Control and Automation
The MC68SEC000AA20's static 32-bit M68k core, 0C to +70C operating range, and 20 MHz throughput make it well suited for industrial PLC and process controller designs. The static architecture enables clock stopping for power saving during idle scan cycles, critical in battery-backed factory automation. The mature 68k toolchain and C compiler support allows deterministic interrupt response for real-time control loops. Designers benefit from the part's dual 3.3 V / 5 V supply flexibility when integrating with mixed-voltage industrial sensor networks.
Recomendado
Legacy Embedded Instrumentation Maintenance
The MC68SEC000AA20 is a direct replacement for the original MC68000 in test and measurement equipment, oscilloscopes, and lab instrumentation where the 68k instruction set is locked into firmware. Its 16-bit external data bus and 24-bit address space (16 MB) match classic 68k system designs exactly. Static operation allows clock-gated idle modes for portable instrument battery life. The 64-QFP package matches existing PCB footprints, enabling refurbishment of legacy instruments without redesign.
Recomendado
Point-of-Sale (POS) Terminals
The MC68SEC000AA20's 32-bit architecture and 5 MIPS throughput at 20 MHz are sufficient for transaction processing, display driving, and encryption acceleration in POS terminals. Its 24-bit address space supports memory-mapped peripherals typical of POS designs including barcode scanners, receipt printers, and PIN pads. The mature 68k RTOS ecosystem (OS-9, pSOS, VxWorks 68k) is well-proven in payment terminals. RoHS compliance and lead-free status meet modern retail electronics requirements.
Recomendado
Telecom Line Cards and Switches
Telecom line cards benefit from the MC68SEC000AA20's static operation for power-saving idle states between calls, plus its deterministic interrupt response for time-division multiplexed protocols. The 16-bit external data bus simplifies interface to legacy telecom ASICs and DSPs that were designed around the 68k bus protocol. The 24-bit address space accommodates large lookup tables for routing and signaling. RoHS compliance matches modern telecom equipment environmental requirements.
Recomendado
Aerospace and Avionics (Legacy Systems)
Aerospace programs with decades-long lifecycles rely on the MC68SEC000AA20 because the mature 68k toolchain is DO-178 qualified and the part has extensive flight heritage. Static operation is valuable for radiation-event recovery in space applications. The 0C to +70C industrial temperature range is often sufficient for cabin and ground-based avionics. Continued availability through Rochester Electronics and authorized brokers is critical for sustaining long-lifecycle aerospace platforms.
Recomendado
Music Synthesizers and Audio Equipment
Classic music synthesizers, samplers, and MIDI processing equipment from the late 1980s and 1990s were built around the Motorola 68k family. The MC68SEC000AA20 serves as a replacement for failed original MC68000s in vintage synthesizers and samplers, where the exact 68k instruction timing affects audio playback behavior. The 16-bit external data bus matches original 68k audio DAC interfaces. Static operation allows battery-backed preset memory in portable synthesizers.
Recomendado
Medical Device Embedded Controllers
The MC68SEC000AA20's static 68k core serves in medical device controllers where deterministic real-time response and a validated toolchain (OS-9, VxWorks) are regulatory requirements. Its 24-bit address space supports memory-mapped I/O for patient monitoring peripherals. The mature 68k architecture simplifies FDA 510(k) submissions because substantial prior art exists. Static operation enables low-power portable medical device modes.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para MC68SEC000AA20 — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | MC68SEC000AA10 | MC68EC000AA20 | MC68EC000AA16 | MC68HC000RC10 | MCF51AC256AVFUE |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors (formerly Freescale/Motorola) | NXP Semiconductors - same | NXP Semiconductors - same | NXP Semiconductors - same | NXP Semiconductors - same | NXP Semiconductors - same |
| Package | 64-QFP (14x14) | 64-QFP (14x14) - same | 64-QFP (14x14) - same | 64-QFP (14x14) - same | 64-QFP (14x14) - same | 64-QFP (14x14) - same |
| Maximum Clock Frequency | 20 MHz | 10 MHz | 20 MHz | 16 MHz | 10 MHz | 50 MHz |
| Core Architecture | 68k SEC000 static | 68k SEC000 static | 68k EC000 dynamic | 68k EC000 dynamic | 68k HC000 | ColdFire V1 |
| Static Operation | Yes (clock stoppable) | Yes | No (dynamic) | No (dynamic) | Yes | Yes |
| External Data Bus | 16-bit | 16-bit | 16-bit | 16-bit | 16-bit | 32-bit |
| Operating Voltage | 3.3 V to 5 V | 3.3 V to 5 V | 5 V | 5 V | 5 V | 1.8 V to 3.3 V |
| Instruction Set | M68k (68k CISC) | M68k | M68k | M68k | M68k | ColdFire/ARM-Thumb (requires port) |
Principais diferenciais
- Static clock-stoppable core for ultra-low-power standby (vs MC68EC000AA20)
- Dual 3.3 V / 5 V supply compatibility (vs MC68EC000AA20)
- 20 MHz speed grade for higher throughput (vs MC68SEC000AA10)
- Modern migration path in same package (vs MCF51AC256AVFUE)
- Mature validated toolchain for regulated industries (vs MC68HC000RC10 (PGA package))
Notas de projeto
The MC68SEC000AA20 operates from a single 3.3 V to 5 V supply with multiple VCC/GND pins (VCC on pins 1, 62, 63, 64; GND on 18, 34, 43). Decouple each VCC pin with a 100 nF ceramic capacitor placed within 5 mm of the package pin, plus a bulk 10 uF tantalum near the supply entry point. The static core allows clock stopping during idle - gate the CLK input to reduce dynamic power to near-zero. Average power dissipation at 20 MHz with active bus is approximately 200 mW.
The 64-QFP package has 0.8 mm pitch leads with a 14x14 mm body. PCB design requires 0.4 mm trace width and 0.2 mm spacing within the package land pattern. Place a continuous ground plane on the layer directly beneath the QFP to provide low-impedance return paths for the 16-bit data bus and address bus signals. Route address and data bus signals first with matched trace lengths, then control signals (AS, DS, LDS, UDS, R/W, DTACK) with controlled impedance of 50 ohms to ground.
The MC68SEC000AA20 bus signals (D0-D15, A1-A23, AS, DS, LDS, UDS, R/W, DTACK) transition synchronously to the clock edge. Source-series termination (22-33 ohm resistors) on the clock line prevents ringing on long clock traces. The DTACK signal must be pulled high with a 4.7 kohm resistor to VCC when not driven, otherwise the bus will hang waiting for acknowledge. Place a 100 pF capacitor on the RESET pin to ground to ensure a clean power-on reset sequence of at least 100 ms.
Common pitfalls with the MC68SEC000AA20: (1) Do not leave the DTACK pin floating - it must be pulled high with 4.7 kohm or it will hang the bus. (2) Function Code outputs (FC0-FC2) must be decoded to enable memory-mapped peripherals, otherwise supervisor mode accesses may collide with user space. (3) The BR/BG/BGACK bus arbitration signals require pull-up resistors if no other bus master is present, otherwise spurious bus grants may occur. (4) CLK must remain within 10% of nominal frequency for bus timing - dynamic frequency scaling is NOT supported on the EC000/SEC000.
Estimated: At 20 MHz with 5 V supply and 50 pF bus load, average power dissipation is approximately 200 mW. The 64-QFP package has a junction-to-ambient thermal resistance of approximately 60 C/W in still air, yielding a junction temperature rise of 12 C above ambient - well within the 0C to +70C operating range. For sealed enclosures without airflow, derate maximum ambient by 10 C or specify the industrial temperature grade variant.
Informações de conformidade
RoHS compliant per DigiKey distributor listing and NXP product brief. Lead-free per DigiKey product detail. AEC-Q100 not applicable (not an automotive-qualified part). Lifecycle is End of Life per NXP product page; verify last-time-buy status before committing to long-life programs.