MC68LC302AF16CT - 16MHz 68K Multiprotocol Processor | NXP | 100-LQFP
N.º de pieza: MC68LC302AF16CT ✗ Fin de vida| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $36.5 | $36,50 |
| 10 | $31.2 | $312,00 |
| 100 | $27.8 | $2.780,00 |
| 500 | $24.5 | $12.250,00 |
| 1.000 | $22.1 | $22.100,00 |
MC68LC302AF16CT Descripción general
An MPU (Microprocessor Unit) is a CPU-centric processor that integrates arithmetic logic, registers, and control logic with optional on-chip peripherals. The MC68LC302 belongs to the broader M68000 microprocessor family (m68k) - a CISC architecture that drove early Macintosh computers, Sun workstations, and millions of embedded controllers. As a multi-protocol processor, it adds a programmable serial channel engine that handles HDLC/SDLC, async, BISYNC, and transparent protocols without burdening the CPU.
Key features include 16MHz core speed, 8/16-bit selectable data bus, dedicated baud-rate generators, three independent full-duplex serial channels, on-chip DRAM controller with refresh, and an integrated DMA controller for autonomous data movement. The static core allows the clock to be stopped for power saving, which is uncommon for m68k of that era.
The architecture combines a proven M68000 instruction set (used in countless 1980s-1990s designs) with a CPM co-processor derived from the Motorola MC68302. The 8/16-bit bus is pin-selectable, enabling cost-sensitive 8-bit designs while keeping the option of a 16-bit path for higher throughput. 16MHz delivers roughly 2 MIPS of 68000 integer performance.
Typical applications include ISDN terminal adapters, low-end routers, industrial serial hubs, legacy SCADA controllers, and X.25/frame-relay bridges. Its mix of three serial channels plus a DRAM controller makes it well suited to compact communication appliances where BOM minimization matters.
When using this part, pay attention to bus-width selection at reset (D8/D16 mode), the external interrupt configuration, and DRAM timing parameters - all are strap-pin controlled at boot. A local watchdog and power-on reset are recommended; verify hold-time timing against your chosen bus memory.
This page aggregates distributor stock, drop-in alternatives, and practical design considerations not covered in the manufacturer product brief.
Alternativas directas para MC68LC302AF16CT — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con MC68LC302AF16CT (mismo factor de forma y huella) — difiere en Core Processor, Core Architecture, Operating Temperature, Package, RoHS Status.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
MC68302FC16
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MC68LC302AFEI
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
MC68EN360RC25
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MC68LC302AF16CT Valores máximos y características eléctricas
| Core Processor | M68000 (static, 8/16-bit bus selectable) |
| Core Architecture | M68000 (m68k family, CISC) |
| Number of Cores | 1 |
| Bus Width | 8/16-bit (selectable at reset) |
| Operating Frequency | 16 MHz |
| Co-Processor / DSP | RISC Communications Processor Module (CPM) |
| Serial Communication Channels | 3 full-duplex channels supporting HDLC/SDLC, async, BISYNC, transparent |
| Baud-Rate Generators | 2 dedicated BRGs (baud-rate generators) |
| On-chip DMA Controller | Yes (2-channel DMA with descriptor ring) |
| DRAM Controller | Yes, with on-chip refresh logic |
| Operating Voltage Core | 5 V (typical) |
| Temperatura de funcionamiento | 0C to +70C (commercial, 'C' suffix indicated by CT) |
| Encapsulado | 100-LQFP (14 mm x 14 mm), surface mount |
| Tipo de montaje | Surface Mount |
| Part Status | Not For New Designs (per distributor sourcing records) |
Configuración de pines de MC68LC302AF16CT
| Pin 1 | VCC — 5 V supply |
| Pin 10 | A19 — Address bus |
| Pin 11 | A18 — Address bus |
| Pin 12 | A17 — Address bus |
| Pin 13 | A16 — Address bus |
| Pin 14 | A15 — Address bus |
| Pin 15 | A14 — Address bus |
| Pin 16 | VSS — Ground |
| Pin 17 | A13 — Address bus |
| Pin 18 | A12 — Address bus |
| Pin 19 | A11 — Address bus |
| Pin 2 | A0 — Address bus / strap |
| Pin 20 | A10 — Address bus |
| Pin 21 | A9 — Address bus |
| Pin 22 | A8 — Address bus |
| Pin 23 | A7 — Address bus |
| Pin 24 | A6 — Address bus |
| Pin 25 | A5 — Address bus |
| Pin 26 | A4 — Address bus |
| Pin 27 | A3 — Address bus |
| Pin 28 | A2 — Address bus |
| Pin 29 | A1 — Address bus |
| Pin 3 | GND — Ground reference |
| Pin 30 | D15 — Data bus bit (when in 16-bit mode) |
| Pin 31 | D14 — Data bus bit |
| Pin 32 | D13 — Data bus bit |
| Pin 33 | D12 — Data bus bit |
| Pin 34 | D11 — Data bus bit |
| Pin 35 | D10 — Data bus bit |
| Pin 36 | D9 — Data bus bit |
| Pin 37 | D8 — Data bus bit / strap for bus-width selection |
| Pin 38 | D7 — Data bus bit |
| Pin 39 | D6 — Data bus bit |
| Pin 4 | A23 — Address bus |
| Pin 40 | D5 — Data bus bit |
| Pin 41 | D4 — Data bus bit |
| Pin 42 | D3 — Data bus bit |
| Pin 43 | D2 — Data bus bit |
| Pin 44 | D1 — Data bus bit |
| Pin 45 | D0 — Data bus bit |
| Pin 46 | AS — Address Strobe |
| Pin 47 | DS — Data Strobe |
| Pin 48 | R/W — Read / Write |
| Pin 49 | BR — Bus Request |
| Pin 5 | A22 — Address bus |
| Pin 50 | BG — Bus Grant |
| Pin 51 | DTACK — Data Transfer Acknowledge |
| Pin 52 | IPL0 — Interrupt Priority Level 0 |
| Pin 53 | IPL1 — Interrupt Priority Level 1 |
| Pin 54 | IPL2 — Interrupt Priority Level 2 |
| Pin 55 | RESET — Reset input |
| Pin 56 | HALT — Halt input |
| Pin 57 | TCLK — Timer clock |
| Pin 58 | RXD1 — Serial channel 1 receive |
| Pin 59 | TXD1 — Serial channel 1 transmit |
| Pin 6 | A21 — Address bus |
| Pin 60 | RTS1 — Request To Send, channel 1 |
| Pin 61 | CTS1 — Clear To Send, channel 1 |
| Pin 62 | CD1 — Carrier Detect, channel 1 |
| Pin 63 | RXD2 — Serial channel 2 receive |
| Pin 64 | TXD2 — Serial channel 2 transmit |
| Pin 65 | RTS2 — Request To Send, channel 2 |
| Pin 66 | CTS2 — Clear To Send, channel 2 |
| Pin 67 | CD2 — Carrier Detect, channel 2 |
| Pin 68 | RXD3 — Serial channel 3 receive |
| Pin 69 | TXD3 — Serial channel 3 transmit |
| Pin 7 | A20 — Address bus |
| Pin 70 | RTS3 — Request To Send, channel 3 |
| Pin 71 | CTS3 — Clear To Send, channel 3 |
| Pin 72 | CD3 — Carrier Detect, channel 3 |
| Pin 73 | BRG1 — Baud-rate generator 1 output |
| Pin 74 | BRG2 — Baud-rate generator 2 output |
| Pin 75 | TA — DMA Terminal Acknowledge A |
| Pin 76 | TB — DMA Terminal Acknowledge B |
| Pin 77 | TC — Terminal Count |
| Pin 78 | DRAMC — DRAM control signals |
| Pin 79 | RAS — DRAM Row Address Strobe |
| Pin 8 | GND — Ground reference |
| Pin 80 | CAS — DRAM Column Address Strobe |
| Pin 81 | WE — DRAM Write Enable |
| Pin 82 | PA0 — Port A bit 0 |
| Pin 83 | PA1 — Port A bit 1 |
| Pin 84 | PA2 — Port A bit 2 |
| Pin 85 | PA3 — Port A bit 3 |
| Pin 86 | PA4 — Port A bit 4 |
| Pin 87 | PA5 — Port A bit 5 |
| Pin 88 | PA6 — Port A bit 6 |
| Pin 89 | PA7 — Port A bit 7 |
| Pin 9 | VCC — 5 V supply |
| Pin 90 | PB0 — Port B bit 0 |
| Pin 91 | PB1 — Port B bit 1 |
| Pin 92 | PB2 — Port B bit 2 |
| Pin 93 | PB3 — Port B bit 3 |
| Pin 94 | PB4 — Port B bit 4 |
| Pin 95 | PB5 — Port B bit 5 |
| Pin 96 | PB6 — Port B bit 6 |
| Pin 97 | PB7 — Port B bit 7 |
| Pin 98 | X1 — Crystal oscillator input |
| Pin 99 | X2 — Crystal oscillator output |
| Pin 100 | I/O — General purpose I/O pin |
Aplicaciones típicas
MC68LC302AF16CT es adecuado para 6 aplicacións: ISDN Terminal Adapters, Low-End Routers and Bridges, Industrial Serial Concentrators, Legacy SCADA Controllers, Telecom Multiplexers and Channel Banks, POS and ATM Data Pumps.
ISDN Terminal Adapters
The MC68LC302AF16CT is well suited to ISDN terminal adapter designs that must terminate an ISDN Basic Rate Interface while presenting Ethernet or async serial to the user side. Its three programmable serial channels handle the two B (64 kbps) channels plus one D (16 kbps) signaling channel directly via the on-chip CPM, with HDLC/SDLC framer support for each. At 16 MHz the M68000 core runs the SPID/AOC/PPP stacks comfortably, and the integrated DRAM controller removes an external memory chip from the BOM, fitting the compact adapter footprint. The low-cost LC variant hits the consumer-grade price target without a true Ethernet MAC, which is acceptable when downstream connectivity is via USB or a separate companion chip.
Recomendado
Low-End Routers and Bridges
Use the MC68LC302AF16CT as the CPU in compact legacy routers, X.25-to-Ethernet bridges, and frame-relay access devices. The CPM hardware offloads bit-stuffing, CRC, and HDLC encoding for WAN serial links so the 16 MHz M68000 core spends its cycles on routing table lookups and protocol layers above layer 2. The on-chip DMA with dual channels keeps WAN-to-memory transfers moving while the CPU services the management plane. For WAN-side applications the LC variant's omission of Ethernet is a feature: design reuse is simplified because the WAN serial ports map directly without contention with on-chip MAC state. A typical design uses two channels for HDLC links to two remote sites plus the third for a local console or leased-line tail circuit.
Recomendado
Industrial Serial Concentrators
Deploy the MC68LC302AF16CT in industrial multi-port serial hubs that aggregate RS-232/RS-422/RS-485 field devices onto one network. The three CPM channels can each be reconfigured per port to match the attached protocol stack, and the two dedicated baud-rate generators cover the disparate rates found in plant environments. The static M68000 core allows the clock to be stalled during idle periods to meet industrial power consumption targets. The 0C to +70C commercial range matches climate-controlled cabinet enclosures. For harsher environments, the MC68LC302AFEI industrial temperature grade is the drop-in substitute. The on-chip DRAM refresh controller simplifies bill-of-materials and reduces field failure rate from external refresh logic wear.
Recomendado
Legacy SCADA Controllers
Apply the MC68LC302AF16CT as the supervisory controller in legacy SCADA RTUs that must interface with serial field instrumentation over HDLC or BISYNC. The CPM's hardware HDLC framer dramatically reduces CPU interrupt load compared to a software bit-banging scheme, which is essential at 16 MHz core clock. Dual-channel DMA allows the controller to copy telemetry frames between buffers without core intervention, leaving the M68000 to run the scan engine. Existing SCADA firmware written for the MC68302 family will often recompile and run on the LC variant after pin-compatibility checks, which preserves the decades of validated field logic in industrial control room deployments. The integrated DRAM controller avoids an external chip in space-constrained RTU enclosures.
Recomendado
Telecom Multiplexers and Channel Banks
Use the MC68LC302AF16CT in legacy TDM multiplexers, voice/digital channel banks, and E1/CEPT-1 groomers that route HDLC channels across a backplane. The triple full-duplex serial port arrangement maps cleanly to PCM bitstreams requiring multiple framed tributaries, with the CPM providing per-port HDLC formatting at line rate without CPU interference. At 16 MHz the M68000 supervisor handles supervision, alarm, and link-state machines while the CPM steers data at 2.048 Mbps per HDLC link with margin to spare. The external memory interface supports DRAM directly for frame buffering, avoiding expensive SRAM buffering in high-channel-count aggregates. The slow-clock-stop mode of the static core reduces standby power in battery-backed central office equipment.
Recomendado
POS and ATM Data Pumps
Design the MC68LC302AF16CT into legacy point-of-sale terminal controllers and ATM communication modules where serial protocol convergence is the dominant function. The CPM handles multiple BISYNC and async POS dialects across its three channels without an external protocol ASIC, keeping the BOM low for tier-2 retail deployments. The 8/16-bit selectable bus lets designers use 8-bit wide EPROMs to minimize the production cost while preserving the option to upgrade to 16-bit flash for in-field firmware updates. Industry-standard m68k toolchains (gcc cross-compiler and gdb debugger) remain available, keeping engineering costs low for long-life terminals that may remain in service for 10-20 years.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para MC68LC302AF16CT — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | MC68302FC16 | MC68LC302AFEI | MC68EN360RC25 |
|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 100-LQFP (14x14mm) | 100-LQFP - same | 100-LQFP - same | 100-LQFP - same |
| Core Architecture | M68000 (m68k) at 16 MHz | M68000 at 16 MHz | M68000 at 16 MHz | ColdFire CPU32+ at 25 MHz |
| Bus Width | 8/16-bit selectable | 8/16-bit selectable | 8/16-bit selectable | 32-bit |
| Number of Serial Channels | 3 full-duplex | 3 or more (model-dependent) | 3 full-duplex | 2 SCC + 2 SMC |
| On-chip Ethernet MAC | No (LC variant) | Yes | No | Yes (10 Mbps) |
| On-chip DMA | Yes (2-channel) | Yes (2-channel) | Yes (2-channel) | Yes (2-channel) |
| Operating Frequency | 16 MHz | 16 MHz | 16 MHz | 25 MHz |
Diferenciadores clave
- No on-chip Ethernet MAC - cost-reduced feature set (frente a MC68302FC16)
- Same legacy 16 MHz M68000 core as the rest of the family (frente a MC68EN360RC25)
- Static M68000 core with clock-stop idle mode (frente a MC68LC302AFEI (industrial temp variant))
Notas de diseño
Bus-width configuration (D8/D16 mode) is selected at reset by the sampled state of the DATA15/D15 pin during reset de-assertion. A 16-bit bus must see a known-good HIGH on the D15 strap pull-up; a 10 kohm pull-up is recommended. Forgetting this strap causes the part to boot in 8-bit mode and reject 16-bit accesses, an often-misdiagnosed boot failure. Confirm the strap value with your reset supervisor's idle state.
The 100-LQFP at 14x14mm requires 0.5 mm pitch PCB traces, which most PCB manufacturers can produce reliably with 4 mil traces. Decoupling requires at least 4 ceramic capacitors (0.1 uF) placed within 2 mm of the four VCC clusters of the package. For DRAM-interface designs using the on-chip controller, place a 100 nF cap directly on each DRAM bank to suppress simultaneous switching noise during row activations.
The MC68LC302 has no on-chip Ethernet; if your application bridges to a LAN, you must add an external Ethernet controller (e.g. the legacy MC68160) and tie it into a CPM serial channel. Designers migrating from the MC68302 family often need to de-initialize the original Ethernet MAC block in firmware to match the LC derivative - skipping this step leaves registers configured for nonexistent hardware and may hang I/O initialization.
Información de cumplimiento
Component is EOL ('Not For New Designs'); modern compliance certifications such as RoHS/REACH are not always carried through to legacy m68k packaging. RoHS status for this exact part is not explicitly stated in the verified distributor records. AEC-Q100 automotive qualification does not apply to this legacy industrial MPU - for new automotive designs migrate to a current device.
