MC68302AG16C - 16MHz M68000 Integrated Comm Processor | NXP
MPN: MC68302AG16C ✗ Cuối đờiMC68302AG16C Tóm tắt
An integrated communications processor (ICP / multi-channel comm controller) is a system-on-chip variant of a microprocessor that adds dedicated serial-channel hardware, DMA, and timers alongside the CPU. It sits in the taxonomy as MPU -> communications processor -> networking SoC -> embedded processor, allowing designers to replace separate UART, DMA, and CPU chips with one device. The MC68302 was the first NXP (then Motorola) device to closely couple an industry-standard MC68000/MC68008 core with a flexible communications architecture, becoming a foundational part for ISDN, modem, router, and X.25 designs.
Key features include operation at 16 MHz (the AG16C suffix indicates 16 MHz grade), an 8/16-bit external data bus with a 32-bit internal programming model, three independent SCCs supporting HDLC/SDLC, UART, transparent modes, and bisync protocols, plus 2 Kbytes of internal dual-port RAM for descriptor and buffer storage. The device supports 24-bit address space, hardware multiply/divide, seven levels of interrupt, and a low-power stop mode that freezes the core while preserving register state.
Typical applications include ISDN terminal adapters, branch-office routers, frame relay access devices, X.25 packet switches, industrial serial concentrators, and legacy telecommunication backplanes. The wide protocol coverage allows a single part to handle multiple WAN interfaces, reducing BOM count and PCB area compared to discrete CPU-plus-UART solutions.
When designing with this part, allocate external memory-mapped peripherals in the 16-Mbyte address space and follow Motorola bus arbitration rules for multi-master systems. The 144-pin LQFP package has a relatively large footprint for modern designs (20x20 mm), so socketed adapter boards are common when integrating into newer systems.
Bộ thay thế dễ dàng lắp đặt cho MC68302AG16C — 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 MC68302AG16C (cùng hình factor và footprint) — khác nhau ở Core Architecture, DMA Channels, RoHS Status, Data Bus Width, Mounting Type.
MC68302AG20C
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MC68302AG25C
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MC68302CAG16
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MC68302RC16C
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →MC68302AG16B
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MC68302AG16C Tỷ lệ tối đa & tính chất điện
| Core Architecture | M68000 (32-bit programming model, 8/16-bit external data bus) |
| Core Family | M683xx / ColdFire-class M68000 |
| Tần số xung maksimum | 16 MHz |
| Điện áp cung cấp hoạt động | 5 V |
| Hộp | 144-pin LQFP (20x20 mm) |
| Kiểu lắp đặt | Surface Mount |
| Number of Cores | 1 |
| Bit Width | 8/16-bit external / 32-bit internal |
| Address Bus Width | 24-bit |
| On-chip RAM | 2 Kbytes (dual-port) |
| Serial Communications Controllers (SCCs) | 3 |
| Serial Management Controllers (SMCs) | 2 |
| DMA Channels | Yes (multi-channel) |
| Parallel I/O | Yes (general-purpose port) |
| Timers | Yes (timer module) |
| Interrupt Levels | 7 |
| Khoảng nhiệt độ hoạt động | 0C to +70C (commercial) |
| Tray Packaging | Tray |
Cấu hình chân MC68302AG16C
| Chân 1 | A1 — Address bus bit 1 |
| Chân 2 | A2 — Address bus bit 2 |
| Chân 3 | A3 — Address bus bit 3 |
| Chân 4 | A4 — Address bus bit 4 |
| Chân 5 | A5 — Address bus bit 5 |
| Chân 6 | A6 — Address bus bit 6 |
| Chân 7 | A7 — Address bus bit 7 |
| Chân 8 | A8 — Address bus bit 8 |
| Chân 9 | A9 — Address bus bit 9 |
| Chân 10 | A10 — Address bus bit 10 |
| Chân 11 | A11 — Address bus bit 11 |
| Chân 12 | A12 — Address bus bit 12 |
| Chân 13 | A13 — Address bus bit 13 |
| Chân 14 | A14 — Address bus bit 14 |
| Chân 15 | A15 — Address bus bit 15 |
| Chân 16 | A16 — Address bus bit 16 |
| Chân 17 | A17 — Address bus bit 17 |
| Chân 18 | A18 — Address bus bit 18 |
| Chân 19 | A19 — Address bus bit 19 |
| Chân 20 | A20 — Address bus bit 20 |
| Chân 21 | A21 — Address bus bit 21 |
| Chân 22 | A22 — Address bus bit 22 |
| Chân 23 | A23 — Address bus bit 23 |
| Chân 24 | VCC — +5 V power |
| 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 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 40 | D15 — Data bus bit 15 |
| Chân 41 | GND — Ground |
| Chân 42 | CS0 — Chip select 0 |
| Chân 43 | CS1 — Chip select 1 |
| Chân 44 | CS2 — Chip select 2 |
| Chân 45 | CS3 — Chip select 3 |
| Chân 46 | CS4 — Chip select 4 |
| Chân 47 | CS5 — Chip select 5 |
| Chân 48 | BR — Bus request |
| Chân 49 | BG — Bus grant |
| Chân 50 | BGACK — Bus grant acknowledge |
| Chân 51 | RESET — Hardware reset (active low) |
| Chân 52 | HALT — Halt (active low) |
| Chân 53 | CLKIN — Clock input |
| Chân 54 | CLKOUT — Clock output |
| Chân 55 | IPL0 — Interrupt priority level 0 |
| Chân 56 | IPL1 — Interrupt priority level 1 |
| Chân 57 | IPL2 — Interrupt priority level 2 |
| Chân 58 | AS — Address strobe |
| Chân 59 | DS — Data strobe |
| Chân 60 | R/W — Read/Write control |
| Chân 61 | DTACK — Data transfer acknowledge |
| Chân 62 | AVEC — Autovector |
| Chân 63 | BERR — Bus error |
| Chân 64 | VCC — +5 V power |
| Chân 65 | SCC1_RXD — SCC1 receive data |
| Chân 66 | SCC1_TXD — SCC1 transmit data |
| Chân 67 | SCC1_RTS — SCC1 request to send |
| Chân 68 | SCC1_CTS — SCC1 clear to send |
| Chân 69 | SCC1_CD — SCC1 carrier detect |
| Chân 70 | SCC1_CTS_BRG — SCC1 CTS / baud-rate generator |
| Chân 71 | SCC2_RXD — SCC2 receive data |
| Chân 72 | SCC2_TXD — SCC2 transmit data |
| Chân 73 | SCC2_RTS — SCC2 request to send |
| Chân 74 | SCC2_CTS — SCC2 clear to send |
| Chân 75 | SCC2_CD — SCC2 carrier detect |
| Chân 76 | GND — Ground |
| Chân 77 | SCC3_RXD — SCC3 receive data |
| Chân 78 | SCC3_TXD — SCC3 transmit data |
| Chân 79 | SCC3_RTS — SCC3 request to send |
| Chân 80 | SCC3_CTS — SCC3 clear to send |
| Chân 81 | SCC3_CD — SCC3 carrier detect |
| Chân 82 | SMC1_RXD — SMC1 receive data |
| Chân 83 | SMC1_TXD — SMC1 transmit data |
| Chân 84 | SMC2_RXD — SMC2 receive data |
| Chân 85 | SMC2_TXD — SMC2 transmit data |
| Chân 86 | VCC — +5 V power |
| Chân 87 | P0 — Parallel I/O port bit 0 |
| Chân 88 | P1 — Parallel I/O port bit 1 |
| Chân 89 | P2 — Parallel I/O port bit 2 |
| Chân 90 | P3 — Parallel I/O port bit 3 |
| Chân 91 | P4 — Parallel I/O port bit 4 |
| Chân 92 | P5 — Parallel I/O port bit 5 |
| Chân 93 | P6 — Parallel I/O port bit 6 |
| Chân 94 | P7 — Parallel I/O port bit 7 |
| Chân 95 | TIN1 — Timer 1 input |
| Chân 96 | TOUT1 — Timer 1 output |
| Chân 97 | TIN2 — Timer 2 input |
| Chân 98 | TOUT2 — Timer 2 output |
| Chân 99 | DREQ0 — DMA request 0 |
| Chân 100 | DACK0 — DMA acknowledge 0 |
| Chân 101 | DREQ1 — DMA request 1 |
| Chân 102 | DACK1 — DMA acknowledge 1 |
| Chân 103 | DONE — DMA done |
| Chân 104 | GND — Ground |
| Chân 105 | RAS0 — DRAM row address strobe 0 |
| Chân 106 | RAS1 — DRAM row address strobe 1 |
| Chân 107 | CAS0 — DRAM column address strobe 0 |
| Chân 108 | CAS1 — DRAM column address strobe 1 |
| Chân 109 | WE — Write enable |
| Chân 110 | OE — Output enable |
| Chân 111 | VCC — +5 V power |
| Chân 112 | FC0 — Function code 0 |
| Chân 113 | FC1 — Function code 1 |
| Chân 114 | FC2 — Function code 2 |
| Chân 115 | RMC — Read-modify-write |
| Chân 116 | SIZ0 — Transfer size 0 |
| Chân 117 | SIZ1 — Transfer size 1 |
| Chân 118 | DBEN — Data bus enable |
| Chân 119 | FREEZE — Freeze output (background debug) |
| Chân 120 | IPIPE0 — Instruction pipe 0 (debug) |
| Chân 121 | IPIPE1 — Instruction pipe 1 (debug) |
| Chân 122 | GND — Ground |
| Chân 123 | TEST — Test mode (factory, tie low in application) |
| Chân 124 | TCLK — Test clock (factory) |
| Chân 125 | TMS — JTAG test mode select |
| Chân 126 | TCK — JTAG test clock |
| Chân 127 | TDI — JTAG test data in |
| Chân 128 | TDO — JTAG test data out |
| Chân 129 | TRST — JTAG test reset |
| Chân 130 | VCC — +5 V power |
| Chân 131 | A0 — Address bus bit 0 (LSB) |
| Chân 132 | LDS — Lower data strobe |
| Chân 133 | UDS — Upper data strobe |
| Chân 134 | GND — Ground |
| Chân 135 | PORTC0 — Port C bit 0 |
| Chân 136 | PORTC1 — Port C bit 1 |
| Chân 137 | PORTC2 — Port C bit 2 |
| Chân 138 | PORTC3 — Port C bit 3 |
| Chân 139 | PORTC4 — Port C bit 4 |
| Chân 140 | PORTC5 — Port C bit 5 |
| Chân 141 | PORTC6 — Port C bit 6 |
| Chân 142 | PORTC7 — Port C bit 7 |
| Chân 143 | PORTC8 — Port C bit 8 |
| Chân 144 | PORTC9 — Port C bit 9 |
Ứng dụng tiêu biểu
MC68302AG16C phù hợp cho 6 Áp dụngs: ISDN Terminal Adapter, Branch-Office Router, X.25 Packet Switch, Industrial Serial Concentrator, Frame Relay Access Device (FRAD), Legacy Telecom Backplane Controller.
ISDN Terminal Adapter
The MC68302AG16C is a classic fit for ISDN terminal adapters because its three on-chip Serial Communications Controllers natively support HDLC framing required by ISDN BRI and PRI channels. Each SCC can be assigned to a B or D channel, eliminating the need for an external HDLC controller and significantly reducing BOM cost. The integrated DMA engine moves packet data between the SCC FIFOs and external RAM without CPU intervention, freeing the 16 MHz M68000 core for upper-layer protocol processing. With 2 Kbytes of dual-port RAM for buffer descriptors, designers can queue multiple frames per channel while maintaining deterministic latency. Compared to a discrete M68000 + UART solution, the MC68302AG16C cuts PCB area and component count while preserving the established M68000 software toolchain.
Được đề xuất
Branch-Office Router
In branch-office router designs the MC68302AG16C's multi-protocol SCCs handle WAN-side HDLC/PPP/frame-relay links while one SMC manages the Ethernet or console UART interface. The 16 MHz M68000 core runs routing table lookups and IP/ICMP processing with predictable instruction timing, an advantage over speculative CPUs for real-time packet forwarding. Hardware bus arbitration allows direct connection to a downstream Ethernet MAC without glue logic. The integrated DMA offloads bulk packet movement, leaving CPU bandwidth for management and routing protocols. Its 24-bit address bus supports up to 16 Mbytes of DRAM plus flash, sufficient for routing tables in small-office installations.
Được đề xuất
X.25 Packet Switch
The MC68302AG16C's SCCs implement the LAPB data-link layer of X.25 directly in hardware, while the M68000 core executes the X.25 packet-level protocol and call setup state machine. The dual-port 2 Kbyte on-chip RAM is well suited for descriptor rings that queue frames per virtual circuit without external logic. Designers can dedicate one SCC to each X.25 link and a third to a higher-layer backbone interface. The chip's deterministic interrupt latency and bus arbitration timing allow X.25 timers and retransmission deadlines to be met reliably. Compared to soft-implemented HDLC on a generic MCU, the MC68302AG16C's hardware CRC and bit stuffing deliver higher link utilization at the same CPU clock.
Được đề xuất
Industrial Serial Concentrator
Multi-drop industrial protocols like Modbus, Profibus (via HDLC-like framing), and BISYNC can be carried concurrently on the MC68302AG16C's five serial channels, making it a serial concentrator for plant networks. The SMC channels provide slower-speed async or SPI-like interfaces for sensors, while the SCCs aggregate them into a backbone uplink. The integrated DMA moves large block transfers without burdening the CPU, and the parallel I/O port adds bit-banged signaling for legacy equipment. Commercial 0 to 70 C operation suits cabinet-mounted controllers. The 144-pin LQFP provides ample ground and power pins for the noisy industrial environment, simplifying PCB decoupling.
Được đề xuất
Frame Relay Access Device (FRAD)
Frame relay FRADs use the MC68302AG16C's HDLC-capable SCCs to terminate the frame-relay DLCI links and the M68000 core to run the FRAD management software. Hardware bit stuffing, CRC, and zero-insertion on each SCC eliminate the software HDLC tax seen on microcontrollers without serial engines. The DMA controller streams encapsulated frames into external DRAM while the CPU handles congestion management and SNMP. With three SCCs, a single MC68302AG16C can terminate multiple frame-relay PVCs without external bridges. The chip's 16 MHz throughput is sufficient for typical sub-E1 aggregate bandwidths of legacy FRAD installations.
Được đề xuất
Legacy Telecom Backplane Controller
Central-office backplanes in legacy telecom equipment use the MC68302AG16C as a per-line controller, where it manages signaling, alarm collection, and protocol conversion for multiple subscriber lines. The parallel I/O port monitors shelf alarms while the SCCs carry HDLC signaling to the upper-level controller. Hardware interrupt prioritization with seven priority levels allows deterministic handling of line-side events. The M68000 instruction set is well supported by long-lifecycle toolchains and field-proven compilers, which is critical for telecom gear with decades-long deployment horizons. The NRND status makes this part best suited for maintaining installed base rather than new product launches.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MC68302AG16C — 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 | MC68302AG20C | MC68302AG25C | MC68302CAG16 | MC68302RC16C | MC68302AG16B |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 144-pin LQFP (20x20 mm) | 144-pin LQFP (20x20 mm) - same | 144-pin LQFP (20x20 mm) - same | 144-pin LQFP (20x20 mm) - same | 144-pin LQFP (20x20 mm) - same | 144-pin LQFP (20x20 mm) - same |
| Maximum Clock Frequency | 16 MHz | 20 MHz | 25 MHz | 16 MHz | 16 MHz | 16 MHz |
| Core | M68000 (32-bit PM) | M68000 (32-bit PM) | M68000 (32-bit PM) | M68000 (32-bit PM) | M68000 (32-bit PM) | M68000 (32-bit PM) |
| Number of SCCs | 3 | 3 | 3 | 3 | 3 | 3 |
| Number of SMCs | 2 | 2 | 2 | 2 | 2 | 2 |
| On-chip RAM | 2 Kbytes | 2 Kbytes | 2 Kbytes | 2 Kbytes | 2 Kbytes | 2 Kbytes |
| Address Bus Width | 24-bit | 24-bit | 24-bit | 24-bit | 24-bit | 24-bit |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V | 5 V | 5 V |
Bảo phân biệt quan trọng
- Integrated multi-protocol SCCs on-chip (vsMC68331CAG16)
- M68000 software compatibility (vsNewer ColdFire MCF5282)
- 144-LQFP same-footprint upgradability (vsMC68302AG25C)
Ghi chú thiết kế
The MC68302AG16C is a 5 V part; decouple each VCC pin with a 0.1 uF ceramic plus a 10 uF bulk tantalum placed within 25 mm of the package. The 144-pin LQFP provides multiple VCC and GND pins distributed around the package; route all VCC pins to the same 5 V plane and stitch a solid ground plane beneath the device. Add a 100 uF bulk cap near the board's 5 V entry point to absorb bus-step transients.
Route the 24-bit address bus and 16-bit data bus with matched trace lengths and 50 ohm characteristic impedance on a 4-layer stackup (signal/GND/VCC/signal). Keep bus traces short - the 16 MHz edge rates generate significant overshoot if traces exceed 50 mm. Place external DRAM chips adjacent to the dedicated RAS/CAS/DRAM pins to minimize skew on the row/column strobes.
Never leave the TEST pin floating - tie TEST directly to GND with a short trace, otherwise the part may enter factory test mode at reset. Always drive BR/BG through proper bus-arbitration logic when connecting a second bus master (e.g., a companion DMA controller), and assert BGACK only after the requesting master has been granted. Do not exceed the 16 MHz CLKIN specification - the AG16C speed grade is not warranted for 20 or 25 MHz operation.
Thông tin tuân thủ
RoHS, REACH, and lead-free status were not explicitly listed in the verified distributor listings we surveyed. As a 1990s commercial-temperature plastic LQFP, the part may or may not be lead-free finished - request the latest material declaration directly from NXP or your distributor before RoHS-restricted designs.
