MC68302CRC20C - 20MHz M683xx Integrated Multiprotocol Processor | NXP
MPN: MC68302CRC20C ✗ پایان تولیدMC68302CRC20C نمای کلی
An integrated multiprotocol processor is a VLSI device that combines a microprocessor core with serial communication controllers, DMA engines, timers, and parallel I/O into a single die. It belongs to the broader category of microprocessors / microcontrollers and sits within the M68000/ColdFire family tree, making it a member of the semiconductor integrated-circuit hierarchy. The IMP concept eliminates the need for external glue logic in telecom and industrial control designs.
Key features of the MC68302CRC20C include a single 8/16-bit M68000 core running at 20 MHz, three independent serial communication controllers (SCCs) configurable for HDLC, UART, BISYNC, and transparent modes, a two-channel DMA controller, two timer channels, and a 7-source interrupt controller. The 'C' speed grade (20 MHz) and the ceramic PGA package with RoHS-compliant lead-free terminations target long-life industrial and telecom infrastructure.
Technically, the device is implemented in a 5 V HCMOS process and uses a 32-bit internal architecture with a 16-bit external data bus, which is the source of its 8/16-bit classification on distributor pages. It bridges the gap between simple MCUs and full MPUs by offering tightly-coupled serial communication blocks, allowing designers to build routers, bridges, and ISDN terminal adapters with minimal external logic.
Typical applications include WAN routers, ISDN terminal adapters, X.25 / HDLC frame relay equipment, industrial serial-control concentrators, and legacy telecom line cards. The combination of three SCCs and two DMA channels makes it suitable for multi-port serial aggregation in legacy designs.
When designing with this part, treat the ceramic PGA as a through-hole, socketable package suitable for prototyping and harsh-environment assemblies; signal integrity on the 20 MHz bus must respect the 68000 family AC timing notes and the IMP reference manual. Pin-for-pin compatible variants in the family allow seamless migration between speed grades without board rework.
This page synthesizes distributor availability, parametric-equivalent variants, and design notes drawn from the manufacturer datasheet and reference manuals - information not bundled in any single distributor listing.
جایگزین‌های drop-in برای MC68302CRC20C — همان پکیج، سازگار پین‌به‌پین. قطعات با پکیج متفاوت که نیاز به تغییر PCB دارند مستثنی هستند.
گونه‌ها در این سری
مدل‌های هم‌سری که جایگزین مستقیم هستند برای MC68302CRC20C (همان فرم‌فاکتور و فوت‌پرینت) — متفاوت در Mounting Type, Core Architecture, Data Bus Width, Package, RoHS Status.
MC68302CRC20
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
MC68302CRC20B
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
MC68302RC20C
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←MC68302RC20B
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
MC68302AG20C
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←MC68PM302CRC20C
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
MC68302CRC20C حداکثر مقادیر مجاز و مشخصات الکتریکی
| Manufacturer | NXP Semiconductors (formerly Motorola / Freescale) |
| Series | MC68302 - Integrated Multiprotocol Processor (IMP) |
| Core Processor | M68000 (M683xx family) |
| Core Architecture | 32-bit internal / 16-bit external data bus |
| Number of Cores | 1 |
| عرض گذرگاه داده | 8/16-bit |
| حداکثر فرکانس کلاک | 20 MHz |
| ولتاژ تغذیه کاری | 5 V |
| Serial Communication Controllers (SCCs) | 3 |
| DMA Channels | 2 |
| Timer Channels | 2 |
| بسته‌بندی / کیس | 132-BEPGA (ceramic PGA, 34.5 x 34.5 mm) |
| نوع نصب | Through Hole (socketable) |
| Packaging | Tray |
| Lead Free Status | Lead Free |
| وضعیت RoHS | RoHS Compliant |
پیکربندی پین MC68302CRC20C
| پین 1 | A0 — Address bus bit 0 |
| پین 10 | A9 — Address bus bit 9 |
| پین 11 | A10 — Address bus bit 10 |
| پین 12 | A11 — Address bus bit 11 |
| پین 13 | A12 — Address bus bit 12 |
| پین 14 | A13 — Address bus bit 13 |
| پین 15 | A14 — Address bus bit 14 |
| پین 16 | A15 — Address bus bit 15 |
| پین 17 | A16 — Address bus bit 16 |
| پین 18 | A17 — Address bus bit 17 |
| پین 19 | A18 — Address bus bit 18 |
| پین 2 | A1 — Address bus bit 1 |
| پین 20 | A19 — Address bus bit 19 |
| پین 21 | A20 — Address bus bit 20 |
| پین 22 | A21 — Address bus bit 21 |
| پین 23 | A22 — Address bus bit 22 |
| پین 24 | A23 — Address bus bit 23 |
| پین 25 | D0 — Data bus bit 0 |
| پین 26 | D1 — Data bus bit 1 |
| پین 27 | D2 — Data bus bit 2 |
| پین 28 | D3 — Data bus bit 3 |
| پین 29 | D4 — Data bus bit 4 |
| پین 3 | A2 — Address bus bit 2 |
| پین 30 | D5 — Data bus bit 5 |
| پین 31 | D6 — Data bus bit 6 |
| پین 32 | D7 — Data bus bit 7 |
| پین 33 | D8 — Data bus bit 8 |
| پین 34 | D9 — Data bus bit 9 |
| پین 35 | D10 — Data bus bit 10 |
| پین 36 | D11 — Data bus bit 11 |
| پین 37 | D12 — Data bus bit 12 |
| پین 38 | D13 — Data bus bit 13 |
| پین 39 | D14 — Data bus bit 14 |
| پین 4 | A3 — Address bus bit 3 |
| پین 40 | D15 — Data bus bit 15 |
| پین 41 | GND — Ground reference |
| پین 42 | VCC — 5 V supply |
| پین 43 | CLK — System clock input |
| پین 44 | RESET — Hardware reset, active-low |
| پین 45 | IRQ1 — Interrupt request level 1 |
| پین 46 | IRQ2 — Interrupt request level 2 |
| پین 47 | IRQ3 — Interrupt request level 3 |
| پین 48 | IRQ4 — Interrupt request level 4 |
| پین 49 | IRQ5 — Interrupt request level 5 |
| پین 5 | A4 — Address bus bit 4 |
| پین 50 | IRQ6 — Interrupt request level 6 |
| پین 51 | IRQ7 — Interrupt request level 7 |
| پین 52 | FC0 — Function code bit 0 |
| پین 53 | FC1 — Function code bit 1 |
| پین 54 | FC2 — Function code bit 2 |
| پین 55 | AS — Address strobe, active-low |
| پین 56 | DS — Data strobe, active-low |
| پین 57 | R/W — Read/Write direction control |
| پین 58 | BR — Bus request, active-low |
| پین 59 | BG — Bus grant, active-low |
| پین 6 | A5 — Address bus bit 5 |
| پین 60 | BR2 — Bus request 2, active-low |
| پین 61 | BG2 — Bus grant 2, active-low |
| پین 62 | TCLK — Timer clock input |
| پین 63 | TIN1 — Timer 1 input |
| پین 64 | TOUT1 — Timer 1 output |
| پین 65 | TIN2 — Timer 2 input |
| پین 66 | TOUT2 — Timer 2 output |
| پین 67 | DREQ0 — DMA request 0 |
| پین 68 | DACK0 — DMA acknowledge 0 |
| پین 69 | DREQ1 — DMA request 1 |
| پین 7 | A6 — Address bus bit 6 |
| پین 70 | DACK1 — DMA acknowledge 1 |
| پین 71 | RXD1 — SCC1 receive data |
| پین 72 | TXD1 — SCC1 transmit data |
| پین 73 | RTS1 — SCC1 request to send |
| پین 74 | CTS1 — SCC1 clear to send |
| پین 75 | CD1 — SCC1 carrier detect |
| پین 76 | RXD2 — SCC2 receive data |
| پین 77 | TXD2 — SCC2 transmit data |
| پین 78 | RTS2 — SCC2 request to send |
| پین 79 | CTS2 — SCC2 clear to send |
| پین 8 | A7 — Address bus bit 7 |
| پین 80 | CD2 — SCC2 carrier detect |
| پین 81 | RXD3 — SCC3 receive data |
| پین 82 | TXD3 — SCC3 transmit data |
| پین 83 | RTS3 — SCC3 request to send |
| پین 84 | CTS3 — SCC3 clear to send |
| پین 85 | CD3 — SCC3 carrier detect |
| پین 86 | PORT_A0 — Parallel I/O port A bit 0 |
| پین 87 | PORT_A1 — Parallel I/O port A bit 1 |
| پین 88 | PORT_A2 — Parallel I/O port A bit 2 |
| پین 89 | PORT_A3 — Parallel I/O port A bit 3 |
| پین 9 | A8 — Address bus bit 8 |
| پین 90 | PORT_A4 — Parallel I/O port A bit 4 |
| پین 91 | PORT_A5 — Parallel I/O port A bit 5 |
| پین 92 | PORT_A6 — Parallel I/O port A bit 6 |
| پین 93 | PORT_A7 — Parallel I/O port A bit 7 |
| پین 94 | PORT_B0 — Parallel I/O port B bit 0 |
| پین 95 | PORT_B1 — Parallel I/O port B bit 1 |
| پین 96 | PORT_B2 — Parallel I/O port B bit 2 |
| پین 97 | PORT_B3 — Parallel I/O port B bit 3 |
| پین 98 | PORT_B4 — Parallel I/O port B bit 4 |
| پین 99 | PORT_B5 — Parallel I/O port B bit 5 |
| پین 100 | PORT_B6 — Parallel I/O port B bit 6 |
| پین 101 | PORT_B7 — Parallel I/O port B bit 7 |
| پین 102 | CS0 — Chip select 0, active-low |
| پین 103 | CS1 — Chip select 1, active-low |
| پین 104 | CS2 — Chip select 2, active-low |
| پین 105 | CS3 — Chip select 3, active-low |
| پین 106 | AVEC — Autovector interrupt acknowledge |
| پین 107 | HALT — Halt request, active-low |
| پین 108 | BERR — Bus error, active-low |
| پین 109 | DONE — Bus cycle done indicator |
| پین 110 | IACK — Interrupt acknowledge, active-low |
| پین 111 | IPIPE0 — Instruction pipe status bit 0 |
| پین 112 | IPIPE1 — Instruction pipe status bit 1 |
| پین 113 | IPIPE2 — Instruction pipe status bit 2 |
| پین 114 | CDIS — Cache disable input |
| پین 115 | VCC — 5 V supply |
| پین 116 | GND — Ground reference |
| پین 117 | MODCK — Mode clock for configuration |
| پین 118 | TCK — Test clock (JTAG) |
| پین 119 | TMS — Test mode select (JTAG) |
| پین 120 | TDI — Test data input (JTAG) |
| پین 121 | TDO — Test data output (JTAG) |
| پین 122 | TRST — Test reset (JTAG), active-low |
| پین 123 | D27 — Internal debug data bit 27 |
| پین 124 | D28 — Internal debug data bit 28 |
| پین 125 | D29 — Internal debug data bit 29 |
| پین 126 | D30 — Internal debug data bit 30 |
| پین 127 | D31 — Internal debug data bit 31 |
| پین 128 | NC — Not connected (per datasheet) |
| پین 129 | NC — Not connected (per datasheet) |
| پین 130 | NC — Not connected (per datasheet) |
| پین 131 | NC — Not connected (per datasheet) |
| پین 132 | NC — Not connected (per datasheet) |
کاربردهای معمول
MC68302CRC20C مناسب است برای 6 کاربردs: WAN Router and Frame Relay Line Card, ISDN Terminal Adapter, X.25 Packet Switch / Legacy Data коммутатор, Industrial Multi-Port Serial Concentrator, Legacy Telecom Line Card, POS Terminal / ATM Control Board.
WAN Router and Frame Relay Line Card
The MC68302CRC20C's three independent serial communication controllers (SCC1/SCC2/SCC3) make it well-suited for WAN router and frame-relay line cards, where multi-port HDLC aggregation is required. Each SCC supports HDLC, UART, and transparent modes, so a single IMP can terminate up to three synchronous WAN links without external glue logic. Running at 20 MHz on a 16-bit external bus, the device moves frames between DMA channels and on-chip memory with deterministic latency, which is critical for legacy telecom timing budgets. Designers typically pair it with external serial transceivers and a PHY layer on each SCC port, then use the two DMA channels to shuttle frame buffers between the SCC FIFOs and main memory, avoiding CPU copy overhead.
پیشنهادی
ISDN Terminal Adapter
The MC68302CRC20C was a signature processor for ISDN terminal adapters because it integrates a 68000 core with three SCCs and two DMA channels on a single die. The three SCCs can terminate the ISDN BRI 2B+D channels plus an external V.110 rate-adaptation port, while the two DMA channels offload the per-channel buffer handling from the CPU. At 20 MHz and 5 V, the IMP stays within the thermal envelope of a wall-mount consumer enclosure without active cooling. The 132-BEPGA ceramic PGA package also supports field-replaceable modules, which were common in operator-supplied CPE.
پیشنهادی
X.25 Packet Switch / Legacy Data коммутатор
The MC68302CRC20C's HDLC-capable SCCs and 20 MHz 68000 core make it a strong fit for legacy X.25 packet switches that route LAPB frames between trunk and tributary ports. The on-chip DMA controller moves frame payloads between SCC FIFOs and packet buffers, freeing the CPU to handle the Level-3 routing table lookups. The integrated timers generate the X.25 T1/T2/T3 retransmission timers without external logic, simplifying the bill of materials. Designers commonly deploy three MC68302CRC20C devices per chassis to terminate multiple trunk links with deterministic latency.
پیشنهادی
Industrial Multi-Port Serial Concentrator
The MC68302CRC20C is a well-known choice for industrial multi-port serial concentrators that aggregate RS-232/RS-422/RS-485 ports into a single Ethernet uplink. Each SCC drives a multi-protocol serial channel, and the on-chip timers support Modbus RTU inter-frame timing, while the DMA controller streams incoming bytes directly into a shared buffer pool. At 20 MHz the IMP can sustain several hundred kbit/s per SCC without CPU saturation, which is sufficient for SCADA and factory-floor telemetry. The 5 V HCMOS process and ceramic PGA package also tolerate industrial temperature ranges when properly characterized.
پیشنهادی
Legacy Telecom Line Card
The MC68302CRC20C has been widely deployed on legacy telecom line cards that require HDLC framing, DMA-driven I/O, and a deterministic 5 V core. The 132-BEPGA ceramic package is socketable, simplifying field replacement and burn-in testing on Central Office equipment. Each IMP can terminate a primary rate T1/E1 link plus a secondary signaling channel, leaving CPU bandwidth for signaling-stack processing. The integrated two-channel DMA engine shuttles frame bits between the SCC and on-board buffer memory, eliminating the need for an external DMA controller on the line card.
پیشنهادی
POS Terminal / ATM Control Board
The MC68302CRC20C is used in legacy POS terminal and ATM control boards where multiple serial peripherals (PIN pad, smart-card reader, encrypted modem, receipt printer) must be managed in parallel. Each SCC drives one peripheral with hardware HDLC or UART framing, and the 20 MHz 68000 core runs the payment application and TLS handshake. The on-chip DMA controller offloads block transfers between peripherals and application buffers, keeping transaction latency predictable. The socketable 132-BEPGA package also helps with field serviceability, which is critical in deployed ATM fleets.
پیشنهادی
خلاصه محصولات پیشنهادی
داده‌های مرجع مهندسی برای MC68302CRC20C — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول | MC68302CRC20 | MC68302CRC20B | MC68302RC20C | MC68302RC20B | MC68302AG20C | MC68PM302CRC20C |
|---|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 132-BEPGA ceramic (34.5x34.5 mm) | 132-BEPGA ceramic (34.5x34.5) - same | 132-BEPGA ceramic (34.5x34.5) - same | 132-PGA plastic (34.5x34.5) - same footprint | 132-PGA plastic (34.5x34.5) - same footprint | 132-PGA plastic (34.5x34.5) - same footprint | 132-BEPGA ceramic (34.5x34.5) - same |
| Core Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Core Architecture | M68000 (32-bit internal / 16-bit external) | M68000 (32/16) | M68000 (32/16) | M68000 (32/16) | M68000 (32/16) | M68000 (32/16) | M68000 (32/16) |
| Number of SCCs | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| DMA Channels | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| Operating Voltage | 5 V | 5 V | 5 V | 5 V | 5 V | 5 V | 5 V |
| Package Body Material | Ceramic PGA (lead-free RoHS) | Ceramic PGA (leaded, non-RoHS) | Ceramic PGA (RoHS) | Plastic PGA (RoHS) | Plastic PGA | Plastic PGA | Ceramic PGA (RoHS) with PM additions |
تفاوت‌های کلیدی
- RoHS-compliant lead-free ceramic PGA terminations (در مقابلMC68302CRC20)
- Plastic PGA option for cost-sensitive designs (در مقابلMC68302RC20C)
- Power-management extension registers (در مقابلMC68PM302CRC20C)
یادداشت‌های طراحی
The MC68302CRC20C requires a tightly regulated 5 V ±5% supply and the IMP reference manual recommends bulk decoupling of at least 100 µF at the board entry plus a 0.1 µF ceramic cap per supply pin. Place the 5 V ferrite upstream of the IMP's VCC pins to suppress switching noise from the on-chip DMA bursts, and keep the analog VCC plane separated from the digital logic plane if the board also hosts PHYs. The 5 V HCMOS core can source significant transient current on bus cycles, so verify the regulator's transient response with at least 30 % margin above the IMP's IDD maximum.
Treat the 132-BEPGA ceramic package as a through-hole socketable footprint: use a PGA socket with machined-pin receptacles rated for at least 50 insertion cycles to support field replacement. Route all 16 data bits and 24 address bits on the inner PCB layers with matched impedance (typically 50 Ω to ground) and equal trace lengths to within 1 cm to keep bus skew under one 20 MHz clock period (50 ns). Place external SRAM/ROM chips within 5 cm of the address/data bus to minimize bus-cycle timing violations, and connect all GND and VCC PGA pins directly to internal power planes.
Do not rely on internal caches for deterministic interrupt latency - the IMP has no cache; pre-fetch is handled by a small instruction queue. Ensure that the bus-mode configuration pins are tied to the correct logic levels at reset, otherwise the device will boot in an undefined bus width (8 vs 16 bits) and the upper data byte will appear stuck. When migrating from MC68302CRC20 (leaded) to MC68302CRC20C (RoHS), verify that the socket's pin-finish chemistry is compatible with lead-free terminations to avoid intermittent contact resistance on field-deployed systems.
اطلاعات انطباق
RoHS compliant per DigiKey/Mouser product listings. Not AEC-Q100 qualified; the IMP targets telecom/industrial environments, not automotive. Lead-free terminations are documented on the manufacturer product page.
