MC68302AG16C - 16MHz M68000 Integrated Comm Processor | NXP
料号： MC68302AG16C ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $21.06 | $21.06 |
| 10 | $19.95 | $199.50 |
| 100 | $17.4 | $1,740.00 |
| 500 | $15.2 | $7,600.00 |
| 1,000 | $13.55 | $13,550.00 |
MC68302AG16C 概述
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.
直接替换替代料： MC68302AG16C ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： MC68302AG16C （相同外形与封装尺寸） ——差异在于 Core Architecture, DMA Channels, Data Bus Width, RoHS Status, Mounting Type.
快速对比工具——选择替代料号进行并排对比：
MC68302AG20C
✅ 直接替换✓ 有现货
$54.1 / 个
查看数据手册 →MC68302AG25C
✅ 直接替换✓ 有现货
$16.4 / 个
查看数据手册 →MC68302CAG16
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MC68302RC16C
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$42.5 / 个
查看数据手册 →MC68302AG16B
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MC68302AG16C 最大额定值与电气特性
| Core Architecture | M68000 (32-bit programming model, 8/16-bit external data bus) |
| Core Family | M683xx / ColdFire-class M68000 |
| 最大时钟频率 | 16 MHz |
| 工作电源电压 | 5 V |
| 封装 | 144-pin LQFP (20x20 mm) |
| 安装类型 | 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 |
| 工作温度范围 | 0C to +70C (commercial) |
| Tray Packaging | Tray |
MC68302AG16C 引脚配置
| 引脚 1 | A1 — Address bus bit 1 |
| 引脚 2 | A2 — Address bus bit 2 |
| 引脚 3 | A3 — Address bus bit 3 |
| 引脚 4 | A4 — Address bus bit 4 |
| 引脚 5 | A5 — Address bus bit 5 |
| 引脚 6 | A6 — Address bus bit 6 |
| 引脚 7 | A7 — Address bus bit 7 |
| 引脚 8 | A8 — Address bus bit 8 |
| 引脚 9 | A9 — Address bus bit 9 |
| 引脚 10 | A10 — Address bus bit 10 |
| 引脚 11 | A11 — Address bus bit 11 |
| 引脚 12 | A12 — Address bus bit 12 |
| 引脚 13 | A13 — Address bus bit 13 |
| 引脚 14 | A14 — Address bus bit 14 |
| 引脚 15 | A15 — Address bus bit 15 |
| 引脚 16 | A16 — Address bus bit 16 |
| 引脚 17 | A17 — Address bus bit 17 |
| 引脚 18 | A18 — Address bus bit 18 |
| 引脚 19 | A19 — Address bus bit 19 |
| 引脚 20 | A20 — Address bus bit 20 |
| 引脚 21 | A21 — Address bus bit 21 |
| 引脚 22 | A22 — Address bus bit 22 |
| 引脚 23 | A23 — Address bus bit 23 |
| 引脚 24 | VCC — +5 V power |
| 引脚 25 | D0 — Data bus bit 0 |
| 引脚 26 | D1 — Data bus bit 1 |
| 引脚 27 | D2 — Data bus bit 2 |
| 引脚 28 | D3 — Data bus bit 3 |
| 引脚 29 | D4 — Data bus bit 4 |
| 引脚 30 | D5 — Data bus bit 5 |
| 引脚 31 | D6 — Data bus bit 6 |
| 引脚 32 | D7 — Data bus bit 7 |
| 引脚 33 | D8 — Data bus bit 8 |
| 引脚 34 | D9 — Data bus bit 9 |
| 引脚 35 | D10 — Data bus bit 10 |
| 引脚 36 | D11 — Data bus bit 11 |
| 引脚 37 | D12 — Data bus bit 12 |
| 引脚 38 | D13 — Data bus bit 13 |
| 引脚 39 | D14 — Data bus bit 14 |
| 引脚 40 | D15 — Data bus bit 15 |
| 引脚 41 | GND — Ground |
| 引脚 42 | CS0 — Chip select 0 |
| 引脚 43 | CS1 — Chip select 1 |
| 引脚 44 | CS2 — Chip select 2 |
| 引脚 45 | CS3 — Chip select 3 |
| 引脚 46 | CS4 — Chip select 4 |
| 引脚 47 | CS5 — Chip select 5 |
| 引脚 48 | BR — Bus request |
| 引脚 49 | BG — Bus grant |
| 引脚 50 | BGACK — Bus grant acknowledge |
| 引脚 51 | RESET — Hardware reset (active low) |
| 引脚 52 | HALT — Halt (active low) |
| 引脚 53 | CLKIN — Clock input |
| 引脚 54 | CLKOUT — Clock output |
| 引脚 55 | IPL0 — Interrupt priority level 0 |
| 引脚 56 | IPL1 — Interrupt priority level 1 |
| 引脚 57 | IPL2 — Interrupt priority level 2 |
| 引脚 58 | AS — Address strobe |
| 引脚 59 | DS — Data strobe |
| 引脚 60 | R/W — Read/Write control |
| 引脚 61 | DTACK — Data transfer acknowledge |
| 引脚 62 | AVEC — Autovector |
| 引脚 63 | BERR — Bus error |
| 引脚 64 | VCC — +5 V power |
| 引脚 65 | SCC1_RXD — SCC1 receive data |
| 引脚 66 | SCC1_TXD — SCC1 transmit data |
| 引脚 67 | SCC1_RTS — SCC1 request to send |
| 引脚 68 | SCC1_CTS — SCC1 clear to send |
| 引脚 69 | SCC1_CD — SCC1 carrier detect |
| 引脚 70 | SCC1_CTS_BRG — SCC1 CTS / baud-rate generator |
| 引脚 71 | SCC2_RXD — SCC2 receive data |
| 引脚 72 | SCC2_TXD — SCC2 transmit data |
| 引脚 73 | SCC2_RTS — SCC2 request to send |
| 引脚 74 | SCC2_CTS — SCC2 clear to send |
| 引脚 75 | SCC2_CD — SCC2 carrier detect |
| 引脚 76 | GND — Ground |
| 引脚 77 | SCC3_RXD — SCC3 receive data |
| 引脚 78 | SCC3_TXD — SCC3 transmit data |
| 引脚 79 | SCC3_RTS — SCC3 request to send |
| 引脚 80 | SCC3_CTS — SCC3 clear to send |
| 引脚 81 | SCC3_CD — SCC3 carrier detect |
| 引脚 82 | SMC1_RXD — SMC1 receive data |
| 引脚 83 | SMC1_TXD — SMC1 transmit data |
| 引脚 84 | SMC2_RXD — SMC2 receive data |
| 引脚 85 | SMC2_TXD — SMC2 transmit data |
| 引脚 86 | VCC — +5 V power |
| 引脚 87 | P0 — Parallel I/O port bit 0 |
| 引脚 88 | P1 — Parallel I/O port bit 1 |
| 引脚 89 | P2 — Parallel I/O port bit 2 |
| 引脚 90 | P3 — Parallel I/O port bit 3 |
| 引脚 91 | P4 — Parallel I/O port bit 4 |
| 引脚 92 | P5 — Parallel I/O port bit 5 |
| 引脚 93 | P6 — Parallel I/O port bit 6 |
| 引脚 94 | P7 — Parallel I/O port bit 7 |
| 引脚 95 | TIN1 — Timer 1 input |
| 引脚 96 | TOUT1 — Timer 1 output |
| 引脚 97 | TIN2 — Timer 2 input |
| 引脚 98 | TOUT2 — Timer 2 output |
| 引脚 99 | DREQ0 — DMA request 0 |
| 引脚 100 | DACK0 — DMA acknowledge 0 |
| 引脚 101 | DREQ1 — DMA request 1 |
| 引脚 102 | DACK1 — DMA acknowledge 1 |
| 引脚 103 | DONE — DMA done |
| 引脚 104 | GND — Ground |
| 引脚 105 | RAS0 — DRAM row address strobe 0 |
| 引脚 106 | RAS1 — DRAM row address strobe 1 |
| 引脚 107 | CAS0 — DRAM column address strobe 0 |
| 引脚 108 | CAS1 — DRAM column address strobe 1 |
| 引脚 109 | WE — Write enable |
| 引脚 110 | OE — Output enable |
| 引脚 111 | VCC — +5 V power |
| 引脚 112 | FC0 — Function code 0 |
| 引脚 113 | FC1 — Function code 1 |
| 引脚 114 | FC2 — Function code 2 |
| 引脚 115 | RMC — Read-modify-write |
| 引脚 116 | SIZ0 — Transfer size 0 |
| 引脚 117 | SIZ1 — Transfer size 1 |
| 引脚 118 | DBEN — Data bus enable |
| 引脚 119 | FREEZE — Freeze output (background debug) |
| 引脚 120 | IPIPE0 — Instruction pipe 0 (debug) |
| 引脚 121 | IPIPE1 — Instruction pipe 1 (debug) |
| 引脚 122 | GND — Ground |
| 引脚 123 | TEST — Test mode (factory, tie low in application) |
| 引脚 124 | TCLK — Test clock (factory) |
| 引脚 125 | TMS — JTAG test mode select |
| 引脚 126 | TCK — JTAG test clock |
| 引脚 127 | TDI — JTAG test data in |
| 引脚 128 | TDO — JTAG test data out |
| 引脚 129 | TRST — JTAG test reset |
| 引脚 130 | VCC — +5 V power |
| 引脚 131 | A0 — Address bus bit 0 (LSB) |
| 引脚 132 | LDS — Lower data strobe |
| 引脚 133 | UDS — Upper data strobe |
| 引脚 134 | GND — Ground |
| 引脚 135 | PORTC0 — Port C bit 0 |
| 引脚 136 | PORTC1 — Port C bit 1 |
| 引脚 137 | PORTC2 — Port C bit 2 |
| 引脚 138 | PORTC3 — Port C bit 3 |
| 引脚 139 | PORTC4 — Port C bit 4 |
| 引脚 140 | PORTC5 — Port C bit 5 |
| 引脚 141 | PORTC6 — Port C bit 6 |
| 引脚 142 | PORTC7 — Port C bit 7 |
| 引脚 143 | PORTC8 — Port C bit 8 |
| 引脚 144 | PORTC9 — Port C bit 9 |
典型应用
MC68302AG16C 适用于 6 应用s: 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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
推荐产品汇总
工程参考数据： MC68302AG16C ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | 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 |
关键差异点
- Integrated multi-protocol SCCs on-chip （对比 MC68331CAG16)
- M68000 software compatibility （对比 Newer ColdFire MCF5282)
- 144-LQFP same-footprint upgradability （对比 MC68302AG25C)
设计说明
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.
合规信息
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.
