MC68302CRC20C - 20MHz M683xx Integrated Multiprotocol Processor | NXP
MPN: MC68302CRC20C ✗ Cuối đờiMC68302CRC20C Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho MC68302CRC20C — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với MC68302CRC20C (cùng hình factor và footprint) — khác nhau ở Mounting Type, Core Architecture, Data Bus Width, Package, RoHS Status.
MC68302CRC20
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MC68302CRC20B
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MC68302RC20C
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MC68302RC20B
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MC68302AG20C
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MC68PM302CRC20C
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MC68302CRC20C Tỷ lệ tối đa & tính chất điện
| 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 |
| Bề rộng đường dữ liệu | 8/16-bit |
| Tần số xung maksimum | 20 MHz |
| Điện áp cung cấp hoạt động | 5 V |
| Serial Communication Controllers (SCCs) | 3 |
| DMA Channels | 2 |
| Timer Channels | 2 |
| Hộp / Vỏ | 132-BEPGA (ceramic PGA, 34.5 x 34.5 mm) |
| Kiểu lắp đặt | Through Hole (socketable) |
| Packaging | Tray |
| Lead Free Status | Lead Free |
| Trạng thái RoHS | RoHS Compliant |
Cấu hình chân MC68302CRC20C
| Chân 1 | A0 — Address bus bit 0 |
| Chân 10 | A9 — Address bus bit 9 |
| Chân 11 | A10 — Address bus bit 10 |
| Chân 12 | A11 — Address bus bit 11 |
| Chân 13 | A12 — Address bus bit 12 |
| Chân 14 | A13 — Address bus bit 13 |
| Chân 15 | A14 — Address bus bit 14 |
| Chân 16 | A15 — Address bus bit 15 |
| Chân 17 | A16 — Address bus bit 16 |
| Chân 18 | A17 — Address bus bit 17 |
| Chân 19 | A18 — Address bus bit 18 |
| Chân 2 | A1 — Address bus bit 1 |
| Chân 20 | A19 — Address bus bit 19 |
| Chân 21 | A20 — Address bus bit 20 |
| Chân 22 | A21 — Address bus bit 21 |
| Chân 23 | A22 — Address bus bit 22 |
| Chân 24 | A23 — Address bus bit 23 |
| Chân 25 | D0 — Data bus bit 0 |
| Chân 26 | D1 — Data bus bit 1 |
| Chân 27 | D2 — Data bus bit 2 |
| Chân 28 | D3 — Data bus bit 3 |
| Chân 29 | D4 — Data bus bit 4 |
| Chân 3 | A2 — Address bus bit 2 |
| Chân 30 | D5 — Data bus bit 5 |
| Chân 31 | D6 — Data bus bit 6 |
| Chân 32 | D7 — Data bus bit 7 |
| Chân 33 | D8 — Data bus bit 8 |
| Chân 34 | D9 — Data bus bit 9 |
| Chân 35 | D10 — Data bus bit 10 |
| Chân 36 | D11 — Data bus bit 11 |
| Chân 37 | D12 — Data bus bit 12 |
| Chân 38 | D13 — Data bus bit 13 |
| Chân 39 | D14 — Data bus bit 14 |
| Chân 4 | A3 — Address bus bit 3 |
| Chân 40 | D15 — Data bus bit 15 |
| Chân 41 | GND — Ground reference |
| Chân 42 | VCC — 5 V supply |
| Chân 43 | CLK — System clock input |
| Chân 44 | RESET — Hardware reset, active-low |
| Chân 45 | IRQ1 — Interrupt request level 1 |
| Chân 46 | IRQ2 — Interrupt request level 2 |
| Chân 47 | IRQ3 — Interrupt request level 3 |
| Chân 48 | IRQ4 — Interrupt request level 4 |
| Chân 49 | IRQ5 — Interrupt request level 5 |
| Chân 5 | A4 — Address bus bit 4 |
| Chân 50 | IRQ6 — Interrupt request level 6 |
| Chân 51 | IRQ7 — Interrupt request level 7 |
| Chân 52 | FC0 — Function code bit 0 |
| Chân 53 | FC1 — Function code bit 1 |
| Chân 54 | FC2 — Function code bit 2 |
| Chân 55 | AS — Address strobe, active-low |
| Chân 56 | DS — Data strobe, active-low |
| Chân 57 | R/W — Read/Write direction control |
| Chân 58 | BR — Bus request, active-low |
| Chân 59 | BG — Bus grant, active-low |
| Chân 6 | A5 — Address bus bit 5 |
| Chân 60 | BR2 — Bus request 2, active-low |
| Chân 61 | BG2 — Bus grant 2, active-low |
| Chân 62 | TCLK — Timer clock input |
| Chân 63 | TIN1 — Timer 1 input |
| Chân 64 | TOUT1 — Timer 1 output |
| Chân 65 | TIN2 — Timer 2 input |
| Chân 66 | TOUT2 — Timer 2 output |
| Chân 67 | DREQ0 — DMA request 0 |
| Chân 68 | DACK0 — DMA acknowledge 0 |
| Chân 69 | DREQ1 — DMA request 1 |
| Chân 7 | A6 — Address bus bit 6 |
| Chân 70 | DACK1 — DMA acknowledge 1 |
| Chân 71 | RXD1 — SCC1 receive data |
| Chân 72 | TXD1 — SCC1 transmit data |
| Chân 73 | RTS1 — SCC1 request to send |
| Chân 74 | CTS1 — SCC1 clear to send |
| Chân 75 | CD1 — SCC1 carrier detect |
| Chân 76 | RXD2 — SCC2 receive data |
| Chân 77 | TXD2 — SCC2 transmit data |
| Chân 78 | RTS2 — SCC2 request to send |
| Chân 79 | CTS2 — SCC2 clear to send |
| Chân 8 | A7 — Address bus bit 7 |
| Chân 80 | CD2 — SCC2 carrier detect |
| Chân 81 | RXD3 — SCC3 receive data |
| Chân 82 | TXD3 — SCC3 transmit data |
| Chân 83 | RTS3 — SCC3 request to send |
| Chân 84 | CTS3 — SCC3 clear to send |
| Chân 85 | CD3 — SCC3 carrier detect |
| Chân 86 | PORT_A0 — Parallel I/O port A bit 0 |
| Chân 87 | PORT_A1 — Parallel I/O port A bit 1 |
| Chân 88 | PORT_A2 — Parallel I/O port A bit 2 |
| Chân 89 | PORT_A3 — Parallel I/O port A bit 3 |
| Chân 9 | A8 — Address bus bit 8 |
| Chân 90 | PORT_A4 — Parallel I/O port A bit 4 |
| Chân 91 | PORT_A5 — Parallel I/O port A bit 5 |
| Chân 92 | PORT_A6 — Parallel I/O port A bit 6 |
| Chân 93 | PORT_A7 — Parallel I/O port A bit 7 |
| Chân 94 | PORT_B0 — Parallel I/O port B bit 0 |
| Chân 95 | PORT_B1 — Parallel I/O port B bit 1 |
| Chân 96 | PORT_B2 — Parallel I/O port B bit 2 |
| Chân 97 | PORT_B3 — Parallel I/O port B bit 3 |
| Chân 98 | PORT_B4 — Parallel I/O port B bit 4 |
| Chân 99 | PORT_B5 — Parallel I/O port B bit 5 |
| Chân 100 | PORT_B6 — Parallel I/O port B bit 6 |
| Chân 101 | PORT_B7 — Parallel I/O port B bit 7 |
| Chân 102 | CS0 — Chip select 0, active-low |
| Chân 103 | CS1 — Chip select 1, active-low |
| Chân 104 | CS2 — Chip select 2, active-low |
| Chân 105 | CS3 — Chip select 3, active-low |
| Chân 106 | AVEC — Autovector interrupt acknowledge |
| Chân 107 | HALT — Halt request, active-low |
| Chân 108 | BERR — Bus error, active-low |
| Chân 109 | DONE — Bus cycle done indicator |
| Chân 110 | IACK — Interrupt acknowledge, active-low |
| Chân 111 | IPIPE0 — Instruction pipe status bit 0 |
| Chân 112 | IPIPE1 — Instruction pipe status bit 1 |
| Chân 113 | IPIPE2 — Instruction pipe status bit 2 |
| Chân 114 | CDIS — Cache disable input |
| Chân 115 | VCC — 5 V supply |
| Chân 116 | GND — Ground reference |
| Chân 117 | MODCK — Mode clock for configuration |
| Chân 118 | TCK — Test clock (JTAG) |
| Chân 119 | TMS — Test mode select (JTAG) |
| Chân 120 | TDI — Test data input (JTAG) |
| Chân 121 | TDO — Test data output (JTAG) |
| Chân 122 | TRST — Test reset (JTAG), active-low |
| Chân 123 | D27 — Internal debug data bit 27 |
| Chân 124 | D28 — Internal debug data bit 28 |
| Chân 125 | D29 — Internal debug data bit 29 |
| Chân 126 | D30 — Internal debug data bit 30 |
| Chân 127 | D31 — Internal debug data bit 31 |
| Chân 128 | NC — Not connected (per datasheet) |
| Chân 129 | NC — Not connected (per datasheet) |
| Chân 130 | NC — Not connected (per datasheet) |
| Chân 131 | NC — Not connected (per datasheet) |
| Chân 132 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
MC68302CRC20C phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MC68302CRC20C — 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 | 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 |
Bảo phân biệt quan trọng
- RoHS-compliant lead-free ceramic PGA terminations (vsMC68302CRC20)
- Plastic PGA option for cost-sensitive designs (vsMC68302RC20C)
- Power-management extension registers (vsMC68PM302CRC20C)
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
