MC68LC302AF16VCT - 16MHz 68K MPU w/ Comm, 100-LQFP | NXP
MPN： MC68LC302AF16VCT ✗ 停產MC68LC302AF16VCT 概覽
An MPU (microprocessor unit) is the central processing element of an embedded system. Unlike a microcontroller, an MPU relies on external memory and peripherals. The 68K (MC68000) architecture is a classic CISC ISA widely used in telecom, industrial control, and aerospace legacy designs. The 68302 family extends this with a closely-coupled CPM that offloads serial and DMA work from the CPU, placing it in the taxonomy: microprocessor -> 68K MPU -> integrated communications processor -> embedded networking IC.
Key features include a 16.67 MHz MC68000 core (1 Core, 8/16-bit internal bus), an RISC CPM for serial/DMA, dual DMA channels (2 IDMA), 1152 bytes of dual-port RAM, and on-chip DRAM refresh controller. The serial interface supports three SCC (Serial Communications Controller) ports plus one SCP port. Operating voltage is 5V typical; the device runs from -40C to +85C.
Typical applications include legacy industrial routers, ISDN terminal adapters, X.25/frame-relay switches, embedded serial-comm controllers, and telecom glue-logic replacement. The integrated CPM reduces BOM count versus a CPU + external UART/DMA design.
Designers should note the 100-LQFP footprint requires thermal attention at high ambient temperatures. Pin-compatible 68302 variants (full, LC, FU) allow memory-size scaling on the same land pattern.
直接替換替代品，適用於 MC68LC302AF16VCT — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： MC68LC302AF16VCT （相同外形與佔位） — 差異在於 Manufacturer.
MC68302AF16VCT
✅ 直接替換📋 參考替代品（不在目錄中）
MC68EN302AF16VCT
✅ 直接替換📋 參考替代品（不在目錄中）
MC68302AF10VCT
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
MC68302AG16VCT
✅ 直接替換📋 參考替代品（不在目錄中）
MC68LC302AF20VCT
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →MC68LC302AF25VCT
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
MC68LC302AF16VCT 最大額定值與電氣特性
| Manufacturer | NXP USA Inc. / Freescale Semiconductor |
| Series | M683xx |
| Core Processor | M68000 |
| Number of Cores | 1 |
| Bus Width | 8/16-Bit |
| Core Speed | 16 MHz (16.67 MHz) |
| Co-Processors / DSP | Communications; RISC CPM |
| RAM Controllers | DRAM |
| 工作溫度 | -40C to +85C |
| 封裝 / 外殼 | 100-LQFP (14x14 mm) |
| 安裝類型 | Surface Mount |
| Part Status | Not For New Designs |
| Peripheral Key Features | HDLC/SDLC, UART, DMA, DRAM controller |
| Supplier Device Package | 100-LQFP |
| RoHS 狀態 | Compliant |
MC68LC302AF16VCT 100-lqfp 腳位配置指南
MC68LC302AF16VCT（100-lqfp 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： MC68LC302AF16VCT.
請參閱 資料表 以查看完整腳位配置。
典型應用
MC68LC302AF16VCT 適用於 6 應用s: Legacy Industrial Router, ISDN Terminal Adapter, X.25 / Frame-Relay Switch, Embedded Serial-Communications Bridge, Telecom Protocol Converter, Industrial Modem Pool.
Legacy Industrial Router
The MC68LC302AF16VCT fits legacy industrial routers because its integrated RISC CPM offloads HDLC/SDLC framing from the 16 MHz MC68000 core, reducing BOM cost versus a CPU-plus-external-UART design. The CPM drives up to 3 SCC channels plus 1 SCP channel, sufficient for legacy WAN interfaces such as V.35, RS-232, and RS-485. With 1152 bytes of dual-port RAM, the CPM and CPU can exchange descriptors without external bus contention. Designers typically pair the device with an external 256Kx16 SRAM and a serial EEPROM for boot config. The 100-LQFP footprint and 5V supply make it drop-in compatible with existing 68302 router designs.
推薦
ISDN Terminal Adapter
ISDN terminal adapters historically used the 68LC302 because the on-chip RISC CPM handles the LAPD (HDLC-based) D-channel framing at full ISDN BRI rates without CPU intervention. The 16 MHz MC68000 core runs the upper-layer protocol stack while the CPM services the physical layer. The 100-LQFP footprint survives in production designs dating from the 1990s, and the LC variant's smaller die fits cost-sensitive consumer terminal equipment. Replace with MCF5272 for new ISDN designs, keeping in mind the 3.3V/1.8V power and BGA package change.
推薦
X.25 / Frame-Relay Switch
The 68LC302 was a classic X.25 packet assembler/disassembler (PAD) and frame-relay switch engine because its CPM natively handles HDLC framing required by X.25 LAPB and frame-relay LMI. The dual IDMA channels manage data movement between the CPM and external packet buffers without loading the CPU. The 16 MHz core is fast enough for typical 64 kbps to 2 Mbps trunk rates. For legacy field upgrades, the same 100-LQFP footprint accommodates the full MC68302 or the Ethernet-enabled MC68EN302 for migration to IP.
推薦
Embedded Serial-Communications Bridge
Industrial serial-bridge designs use the 68LC302 to convert between UART, HDLC, and proprietary synchronous protocols because the CPM's SCCs are independently programmable. Designers can dedicate SCC1 to UART (for SCADA), SCC2 to HDLC (for radio link), and SCC3 to bisync (for legacy controllers), all sharing one IC. The 16 MHz core manages the bridging logic while the CPM services line-rate traffic. The 100-LQFP footprint allows compact industrial SBC designs and matches the LC family's price-sensitive positioning.
推薦
Telecom Protocol Converter
Protocol converters between SS7, V.24, and proprietary telecom busses historically relied on the 68302 family's tightly coupled CPM, since the dual-port RAM allows zero-copy descriptor passing between SCC channels. The 68LC302's 5V supply, 100-LQFP footprint, and 16 MHz clock rate remain adequate for legacy 64 kbps trunk conversion. Modern designs should migrate to MCF5272 or MCF5282 ColdFire parts, accepting a BGA package and 3.3V supply change.
推薦
Industrial Modem Pool
Multiport industrial modems historically used the 68LC302 as a shared controller arbitrating multiple UART channels. Each SCC supports independent baud rates and protocols, allowing one IC to drive 3 modems while the 16 MHz MC68000 core handles AT command parsing and error correction. The integrated DRAM controller simplifies PCB layout by removing external glue logic. The 100-LQFP footprint keeps the modem pool design compact, and the LC pricing matches cost-sensitive industrial volumes.
推薦
推薦產品摘要
工程參考資料，適用於 MC68LC302AF16VCT — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | MC68302AF16VCT | MC68EN302AF16VCT | MC68302AF10VCT | MC68302AG16VCT | MC68LC302AF20VCT | MC68LC302AF25VCT |
|---|---|---|---|---|---|---|---|
| Package | 100-LQFP (14x14) | 100-LQFP (14x14) - same | 100-LQFP (14x14) - same | 100-LQFP (14x14) - same | 100-LQFP (14x14) - same | 100-LQFP (14x14) - same | 100-LQFP (14x14) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Core Speed | 16 MHz | 16 MHz | 16 MHz | 10 MHz | 16 MHz | 20 MHz | 25 MHz |
| Core Processor | MC68000 (LC) | MC68000 (full) | MC68000 + Ethernet | MC68000 (full) | MC68000 (full) | MC68000 (LC) | MC68000 (LC) |
| SCC Channels | 3 SCC + 1 SCP | 3 SCC + 1 SCP | 3 SCC + 1 SCP | 3 SCC + 1 SCP | 3 SCC + 1 SCP | 3 SCC + 1 SCP | 3 SCC + 1 SCP |
| Ethernet MAC | No | No | Yes | No | No | No | No |
| Lifecycle Status | NRND | NRND | NRND | NRND | NRND | NRND | NRND |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
主要差異化特點
- Pin-compatible migration to MC68302 full variant (對比MC68302AF16VCT)
- Integrated Ethernet MAC option available in same package (對比MC68EN302AF16VCT)
- Lowest-cost entry into 68302 family (對比MC68302AF16VCT)
設計說明
The MC68LC302AF16VCT requires a stable 5V supply with a 100 mA typical current budget. Place a 100 nF decoupling capacitor at each of the four VCC pin clusters and a 10 uF bulk capacitor near the package. The internal PLL is sensitive to VCC ripple; keep switching regulators away from the analog 5V rail or add pi-filter LC networks. Power-on reset is generated internally; hold /RESET low for at least 100 ms after VCC reaches 4.75V to ensure clean initialization.
Route the 16.67 MHz CPU clock with a short trace surrounded by ground; avoid running it parallel to the address bus for more than 25 mm to limit crosstalk. The DRAM controller outputs RAS/CAS signals with fast edge rates - keep these traces length-matched within 5 mm to avoid double-clocking at high temperature. The 100-LQFP footprint has a 0.5 mm pitch; use 0.2 mm trace/space rules and a 4-layer stackup with continuous ground plane below the part for controlled impedance on the bus.
Three common pitfalls: (1) Failing to initialize the CPM SCC baud-rate generator prescaler before enabling the SCC; this causes silent protocol failures. (2) Leaving /IRQ7 floating; the internal interrupt controller expects a defined level. (4) Using address lines A0-A23 without external bus transceivers when driving more than 2 DRAM banks - the LC302 lacks the bus-hold strength of the full MC68302. Always consult the MC68302 family datasheet chapter on bus arbitration before adding external bus masters.
合規資訊
RoHS-compliant per NXP product page. Not AEC-Q100 qualified (industrial/legacy telecom use). Halogen-free status unknown - consult NXP environmental compliance documentation.