MC68LC302AF16CT - 16MHz 68K Multiprotocol Processor | NXP | 100-LQFP
Référence : MC68LC302AF16CT ✗ Fin de vie| Qté | Prix unitaire | 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 Présentation
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.
Alternatives de remplacement direct pour MC68LC302AF16CT — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec MC68LC302AF16CT (même facteur de forme et même empreinte) — différant par Core Processor, Core Architecture, Operating Temperature, Package, RoHS Status.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
MC68302FC16
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MC68LC302AFEI
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
MC68EN360RC25
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MC68LC302AF16CT Valeurs maximales et caractéristiques électriques
| 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) |
| Température de fonctionnement | 0C to +70C (commercial, 'C' suffix indicated by CT) |
| Boîtier | 100-LQFP (14 mm x 14 mm), surface mount |
| Type de montage | Surface Mount |
| Part Status | Not For New Designs (per distributor sourcing records) |
Configuration des broches de MC68LC302AF16CT
| Broche 1 | VCC — 5 V supply |
| Broche 10 | A19 — Address bus |
| Broche 11 | A18 — Address bus |
| Broche 12 | A17 — Address bus |
| Broche 13 | A16 — Address bus |
| Broche 14 | A15 — Address bus |
| Broche 15 | A14 — Address bus |
| Broche 16 | VSS — Ground |
| Broche 17 | A13 — Address bus |
| Broche 18 | A12 — Address bus |
| Broche 19 | A11 — Address bus |
| Broche 2 | A0 — Address bus / strap |
| Broche 20 | A10 — Address bus |
| Broche 21 | A9 — Address bus |
| Broche 22 | A8 — Address bus |
| Broche 23 | A7 — Address bus |
| Broche 24 | A6 — Address bus |
| Broche 25 | A5 — Address bus |
| Broche 26 | A4 — Address bus |
| Broche 27 | A3 — Address bus |
| Broche 28 | A2 — Address bus |
| Broche 29 | A1 — Address bus |
| Broche 3 | GND — Ground reference |
| Broche 30 | D15 — Data bus bit (when in 16-bit mode) |
| Broche 31 | D14 — Data bus bit |
| Broche 32 | D13 — Data bus bit |
| Broche 33 | D12 — Data bus bit |
| Broche 34 | D11 — Data bus bit |
| Broche 35 | D10 — Data bus bit |
| Broche 36 | D9 — Data bus bit |
| Broche 37 | D8 — Data bus bit / strap for bus-width selection |
| Broche 38 | D7 — Data bus bit |
| Broche 39 | D6 — Data bus bit |
| Broche 4 | A23 — Address bus |
| Broche 40 | D5 — Data bus bit |
| Broche 41 | D4 — Data bus bit |
| Broche 42 | D3 — Data bus bit |
| Broche 43 | D2 — Data bus bit |
| Broche 44 | D1 — Data bus bit |
| Broche 45 | D0 — Data bus bit |
| Broche 46 | AS — Address Strobe |
| Broche 47 | DS — Data Strobe |
| Broche 48 | R/W — Read / Write |
| Broche 49 | BR — Bus Request |
| Broche 5 | A22 — Address bus |
| Broche 50 | BG — Bus Grant |
| Broche 51 | DTACK — Data Transfer Acknowledge |
| Broche 52 | IPL0 — Interrupt Priority Level 0 |
| Broche 53 | IPL1 — Interrupt Priority Level 1 |
| Broche 54 | IPL2 — Interrupt Priority Level 2 |
| Broche 55 | RESET — Reset input |
| Broche 56 | HALT — Halt input |
| Broche 57 | TCLK — Timer clock |
| Broche 58 | RXD1 — Serial channel 1 receive |
| Broche 59 | TXD1 — Serial channel 1 transmit |
| Broche 6 | A21 — Address bus |
| Broche 60 | RTS1 — Request To Send, channel 1 |
| Broche 61 | CTS1 — Clear To Send, channel 1 |
| Broche 62 | CD1 — Carrier Detect, channel 1 |
| Broche 63 | RXD2 — Serial channel 2 receive |
| Broche 64 | TXD2 — Serial channel 2 transmit |
| Broche 65 | RTS2 — Request To Send, channel 2 |
| Broche 66 | CTS2 — Clear To Send, channel 2 |
| Broche 67 | CD2 — Carrier Detect, channel 2 |
| Broche 68 | RXD3 — Serial channel 3 receive |
| Broche 69 | TXD3 — Serial channel 3 transmit |
| Broche 7 | A20 — Address bus |
| Broche 70 | RTS3 — Request To Send, channel 3 |
| Broche 71 | CTS3 — Clear To Send, channel 3 |
| Broche 72 | CD3 — Carrier Detect, channel 3 |
| Broche 73 | BRG1 — Baud-rate generator 1 output |
| Broche 74 | BRG2 — Baud-rate generator 2 output |
| Broche 75 | TA — DMA Terminal Acknowledge A |
| Broche 76 | TB — DMA Terminal Acknowledge B |
| Broche 77 | TC — Terminal Count |
| Broche 78 | DRAMC — DRAM control signals |
| Broche 79 | RAS — DRAM Row Address Strobe |
| Broche 8 | GND — Ground reference |
| Broche 80 | CAS — DRAM Column Address Strobe |
| Broche 81 | WE — DRAM Write Enable |
| Broche 82 | PA0 — Port A bit 0 |
| Broche 83 | PA1 — Port A bit 1 |
| Broche 84 | PA2 — Port A bit 2 |
| Broche 85 | PA3 — Port A bit 3 |
| Broche 86 | PA4 — Port A bit 4 |
| Broche 87 | PA5 — Port A bit 5 |
| Broche 88 | PA6 — Port A bit 6 |
| Broche 89 | PA7 — Port A bit 7 |
| Broche 9 | VCC — 5 V supply |
| Broche 90 | PB0 — Port B bit 0 |
| Broche 91 | PB1 — Port B bit 1 |
| Broche 92 | PB2 — Port B bit 2 |
| Broche 93 | PB3 — Port B bit 3 |
| Broche 94 | PB4 — Port B bit 4 |
| Broche 95 | PB5 — Port B bit 5 |
| Broche 96 | PB6 — Port B bit 6 |
| Broche 97 | PB7 — Port B bit 7 |
| Broche 98 | X1 — Crystal oscillator input |
| Broche 99 | X2 — Crystal oscillator output |
| Broche 100 | I/O — General purpose I/O pin |
Applications typiques
MC68LC302AF16CT convient pour 6 applications: 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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MC68LC302AF16CT — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | 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 |
Principaux différenciateurs
- No on-chip Ethernet MAC - cost-reduced feature set (vs MC68302FC16)
- Same legacy 16 MHz M68000 core as the rest of the family (vs MC68EN360RC25)
- Static M68000 core with clock-stop idle mode (vs MC68LC302AFEI (industrial temp variant))
Notes de conception
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.
Informations de conformité
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.
