MC68302AG25C - 25MHz M683xx Integrated Comm Processor | NXP
料号： MC68302AG25C ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $28.5 | $28.50 |
| 10 | $25.2 | $252.00 |
| 100 | $22 | $2,200.00 |
| 500 | $18.8 | $9,400.00 |
| 1,000 | $16.4 | $16,400.00 |
MC68302AG25C 概述
An integrated communications processor (ICP) is a category of embedded microprocessor that tightly couples a CPU core with dedicated serial-channel and DMA hardware on the same silicon die. In the system hierarchy, the MC68302 sits above generic microcontrollers (which typically lack multi-protocol serial engines) and below full network processors (NPUs) that integrate dedicated MAC-layer offload. This integration reduces external component count in embedded networking designs by replacing discrete UART, DMA, and interrupt controller chips with on-die logic.
Key features of the MC68302AG25C include a 25 MHz maximum internal clock, 8/16-bit external data bus width, separate 32-bit M68000 internal architecture, programmable chip-select outputs, dual-port RAM for descriptor management, and a watchdog timer. The device operates from a single 5 V supply and is rated for the commercial temperature range of 0C to 70C.
Architecturally, the MC68302 separates control-plane and data-plane tasks by offloading DMA and serial-protocol handling to the CPM block. Each SCC supports protocols such as HDLC, UART, BISYNC, and transparent mode, while the IDMA controller supports linked-list descriptor operation. This dual-engine partitioning enables sustained serial throughput even when the CPU is servicing application-layer logic.
Typical applications include ISDN terminal adapters, low-end routers and bridges, industrial serial concentrators, factory automation gateways, and legacy telecom line cards. Its wide protocol support makes it especially suited to multi-protocol serial multiplexing in industrial and telecom systems.
When designing with the MC68302AG25C, ensure that the host PCB provides a 25 MHz oscillator with adequate stability, and that the system memory map is configured via the base address registers before any peripheral initialization. Improper bus-cycle termination can cause intermittent DMA underruns under heavy SCC load.
This page synthesizes distributor availability, drop-in alternatives within the M68302 family, and practical design considerations not consolidated in the original Motorola/Freescale datasheet.
直接替换替代料： MC68302AG25C ——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： MC68302AG25C （相同外形与封装尺寸） ——差异在于 Core Architecture, Address Bus Width, DMA Channels, Data Bus Width, Maximum Clock Frequency.
快速对比工具——选择替代料号进行并排对比：
MC68302FC25C
✅ 直接替换📋 参考替代料（不在目录中）
MC68302CFC25C
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MC68302AG16C
✅ 直接替换✓ 有现货
$13.55 / 个
查看数据手册 →MC68302FC20C
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MC68302AG20C
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$54.1 / 个
查看数据手册 →MC68302AG25C 最大额定值与电气特性
| Core Processor | M68000 |
| Core Architecture | M683xx |
| Number of Cores | 1 |
| 数据总线宽度 | 8/16 bit |
| 最大时钟频率 | 25 MHz |
| Internal Architecture | 32-bit |
| 电源电压 | 5 V |
| 工作温度 | 0C to 70C |
| 封装 / 外壳 | 144-LQFP (20x20 mm) |
| 安装类型 | Surface Mount |
| Serial Communication Controllers (SCC) | 3 |
| Serial Management Controllers (SMC) | 2 |
| DMA Channels (IDMA) | 2 |
| Timers | 2 x 16-bit |
| Watchdog Timer | Yes |
| Programmable Chip Selects | Yes |
| Dual-Port RAM | Yes (for descriptors) |
| RoHS 状态 | Compliant (factory statement) |
MC68302AG25C 144-lqfp (20x20 mm) 引脚配置指南
MC68302AG25C（144-lqfp (20x20 mm) 封装）的引脚配置。 该数字 IC 包含 GPIO、通信接口（UART、SPI、I2C）和电源引脚。请参阅制造商数据手册以了解复用引脚功能和配置选项。对嵌入式系统设计和 PCB 布局至关重要。
暂无详细引脚数据： MC68302AG25C.
请参阅 数据手册 以查看完整引脚配置。
典型应用
MC68302AG25C 适用于 6 应用s: ISDN Terminal Adapter, Low-End Router/Bridge, Industrial Serial Concentrator, Factory Automation Gateway, Legacy Telecom Line Card, POS Terminal / Embedded Controller.
ISDN Terminal Adapter
The MC68302AG25C fits ISDN terminal adapters because its three SCCs support HDLC/SDLC framing at sustained bit rates well above ISDN BRI's 144 kbps per B-channel. With 25 MHz core clock and on-chip IDMA, the CPM block can offload framing and DMA tasks so the CPU handles only the application layer. The 144-LQFP package supports the small form factor typical of desktop ISDN adapters.
推荐
Low-End Router/Bridge
The MC68302AG25C fits low-end router/bridge designs because its three SCCs map naturally to LAN/WAN/modem ports and the IDMA engine handles packet transfer to/from external buffer memory without CPU intervention. At 25 MHz the M68000 core can route small frames at wire rate on low-speed serial links. The 5 V single supply and 144-LQFP package suit industrial router hardware where reliability matters more than absolute throughput.
推荐
Industrial Serial Concentrator
The MC68302AG25C fits industrial serial concentrators that aggregate multiple RS-232/RS-485 links because each SCC independently supports UART framing and the IDMA engine links descriptors for back-to-back reception. At 25 MHz the device can manage five simultaneous serial channels (3 SCC + 2 SMC) with low CPU overhead. The commercial 0-70C range suits factory-floor cabinets; the 5 V supply simplifies power design.
推荐
Factory Automation Gateway
The MC68302AG25C fits factory automation gateways that bridge fieldbus protocols (Profibus, Modbus, etc.) to Ethernet or higher-speed backbones because its multi-protocol SCCs can be configured to support the framing of each fieldbus variant. The on-chip watchdog timer and programmable chip selects simplify interface logic to glue peripherals. Designers favor the 144-LQFP package for its industrial-grade assembly compatibility.
推荐
Legacy Telecom Line Card
The MC68302AG25C fits legacy telecom line cards where HDLC channels terminate T1/E1 spans because each SCC handles full HDLC bit stuffing and CRC generation in hardware at 1.544/2.048 Mbps. The 25 MHz core can supervise per-channel maintenance without taxing CPU bandwidth. Its 5 V supply aligns with legacy backplane power designs still deployed in central-office line-card shelves.
推荐
POS Terminal / Embedded Controller
The MC68302AG25C fits point-of-sale terminals and embedded controllers that require multiple UART peripherals (printer, scanner, EFT modem) because its five independent serial channels (3 SCC + 2 SMC) eliminate the need for an external UART-expansion chip. The M68000 core executes terminal-control firmware comfortably at 25 MHz. The 144-LQFP package meets surface-mount manufacturing cost targets.
推荐
推荐产品汇总
工程参考数据： MC68302AG25C ——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 | MC68302FC25C | MC68302CFC25C | MC68302AG16C | MC68302FC20C | MC68302AG20C |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors (formerly Freescale) | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 144-LQFP (20x20) | 144-LQFP (20x20) - same | 144-LQFP (20x20) - same | 144-LQFP (20x20) - same | 144-LQFP (20x20) - same | 144-LQFP (20x20) - same |
| Maximum Clock Frequency | 25 MHz | 25 MHz | 25 MHz | 16 MHz (-36%) | 20 MHz (-20%) | 20 MHz (-20%) |
| Core Architecture | M68000 | M68000 | M68000 | M68000 | M68000 | M68000 |
| Data Bus Width | 8/16 bit | 8/16 bit | 8/16 bit | 8/16 bit | 8/16 bit | 8/16 bit |
| Operating Temperature | 0C to 70C (commercial) | 0C to 70C | -40C to 85C (industrial CF grade) | 0C to 70C | 0C to 70C | 0C to 70C |
| SCC Count | 3 | 3 | 3 | 3 | 3 | 3 |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V | 5 V | 5 V |
关键差异点
- Faster clock than 16 MHz / 20 MHz M68302 grades （对比 MC68302AG16C)
- Industrial temperature variant available in same package （对比 MC68302CFC25C)
- Three independent SCCs vs MC68332's QSM （对比 MC68332ACAG25)
设计说明
Estimated: The MC68302AG25C draws approximately 200-300 mA from a single 5 V supply at 25 MHz. Provide a 10 uF tantalum bulk capacitor near the VCC pins and 0.1 uF ceramic decoupling on each VCC pin pair. Unlike low-voltage ARM/ColdFire parts, no separate core or PLL rail is required.
Estimated: At continuous 25 MHz with all SCCs active, power dissipation is roughly 1.0-1.5 W. The 144-LQFP package thermal resistance theta_JA is approximately 35 C/W on a standard 4-layer JEDEC test board, yielding a junction temperature rise of 35-50C above ambient. For continuous full-load operation in cabinets exceeding 50C ambient, ensure adequate airflow or attach a small heatsink.
Do not exceed 5.5 V on any VCC pin or 6.5 V absolute maximum on input pins - the M68000 core is a 5 V part and lacks modern ESD tolerance. Ensure the external 25 MHz oscillator meets the datasheet AC electrical characteristics (rise/fall time under 5 ns). Improper bus-cycle termination can cause intermittent DMA underruns under heavy SCC load - terminate bus signals per the application note recommendations.
The external data bus operates at 8/16-bit width with synchronous clocking at 25 MHz. Trace lengths on the address/data bus should be matched to within 25 mm to avoid bus contention during read/write cycles. Add 33 ohm series termination on the bus signals if routing exceeds 50 mm, especially on backplane designs where multiple loads are present.
合规信息
RoHS compliance per NXP factory statements. Not AEC-Q100 qualified (this is a telecom/networking MPU, not automotive). For automotive-grade networking processors, consider MCF52235 or similar ColdFire automotive parts.
