NXP Semiconductors
MC68302AG20C - 20MHz M68300 Integrated Comm Processor | NXP
MPN： MC68302AG20C ✗ 停產
5 V Vdss
144-LQFP (20x20 mm) Package
20 MHz Speed
MOQ： 1 |
MC68302AG20C 概覽
The NXP MC68302AG20C is a 20 MHz M68000-family integrated multi-channel communications processor with a 68000 core, DMA controller, serial communication controllers (SCCs), and a 144-pin LQFP (20x20 mm) package. It targets embedded networking and telecom designs where deterministic serial I/O is required alongside a familiar 68000 instruction set, and is offered in the 144-LQFP plastic package. The 'G20' suffix denotes the 20 MHz maximum CPU clock and the 'A' package designator is the LQFP-144 plastic package.
What is an integrated communications processor? An integrated communications processor (ICP) combines a general-purpose CPU core with on-chip peripherals such as DMA engines, serial channel controllers, timers, and parallel ports that are tuned for protocol handling. The M68302 was the first device to offer a closely-coupled, industry-standard MC68000/MC68008 microprocessor core combined with a flexible communications architecture, placing it inside the broader taxonomy: microcontroller -> microprocessor -> integrated communications processor -> embedded networking SoC -> semiconductor.
Key features include up to three independent serial communications controllers (SCCs) supporting HDLC/SDLC, UART, and BISYNC protocols, a 2-channel DMA engine, 1152 bytes of on-chip dual-port RAM, a 24-bit address bus providing 16 MB of linear addressing, and an interrupt controller with up to seven external interrupt sources. The device operates from a single 5 V supply and supports a maximum CPU clock of 20 MHz.
The MC68302 architecture is built around a true 32-bit internal 68000 core running with a 16-bit external data bus, allowing engineers to reuse legacy 68000 firmware while gaining dedicated serial DMA offload. The on-chip RISC communications processor (CP) handles bit-level protocol work, freeing the core for higher-layer tasks. This dual-engine design was pioneering for early 1990s networking ASICs.
Typical applications include ISDN terminal adapters, ISDN modem modules, X.25 packet switches, industrial routers, factory-floor communication controllers, and legacy telecom backplane designs. The part also appears in industrial serial-bridge gateways and protocol-conversion adapters where deterministic SCC behaviour is required.
When designing with the MC68302AG20C, ensure proper bus arbitration and timing closure for the 20 MHz external clock. The SCC pins require external transceivers for RS-232/RS-485 connectivity. According to the NXP datasheet, decoupling must be placed close to the multiple VCC/GND pairs of the LQFP-144.
This page synthesizes distributor stock signals, EOL status, drop-in 68000-family alternatives, and design notes beyond what the manufacturer datasheet alone offers.
What is an integrated communications processor? An integrated communications processor (ICP) combines a general-purpose CPU core with on-chip peripherals such as DMA engines, serial channel controllers, timers, and parallel ports that are tuned for protocol handling. The M68302 was the first device to offer a closely-coupled, industry-standard MC68000/MC68008 microprocessor core combined with a flexible communications architecture, placing it inside the broader taxonomy: microcontroller -> microprocessor -> integrated communications processor -> embedded networking SoC -> semiconductor.
Key features include up to three independent serial communications controllers (SCCs) supporting HDLC/SDLC, UART, and BISYNC protocols, a 2-channel DMA engine, 1152 bytes of on-chip dual-port RAM, a 24-bit address bus providing 16 MB of linear addressing, and an interrupt controller with up to seven external interrupt sources. The device operates from a single 5 V supply and supports a maximum CPU clock of 20 MHz.
The MC68302 architecture is built around a true 32-bit internal 68000 core running with a 16-bit external data bus, allowing engineers to reuse legacy 68000 firmware while gaining dedicated serial DMA offload. The on-chip RISC communications processor (CP) handles bit-level protocol work, freeing the core for higher-layer tasks. This dual-engine design was pioneering for early 1990s networking ASICs.
Typical applications include ISDN terminal adapters, ISDN modem modules, X.25 packet switches, industrial routers, factory-floor communication controllers, and legacy telecom backplane designs. The part also appears in industrial serial-bridge gateways and protocol-conversion adapters where deterministic SCC behaviour is required.
When designing with the MC68302AG20C, ensure proper bus arbitration and timing closure for the 20 MHz external clock. The SCC pins require external transceivers for RS-232/RS-485 connectivity. According to the NXP datasheet, decoupling must be placed close to the multiple VCC/GND pairs of the LQFP-144.
This page synthesizes distributor stock signals, EOL status, drop-in 68000-family alternatives, and design notes beyond what the manufacturer datasheet alone offers.
直接替換替代品，適用於 MC68302AG20C — 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： MC68302AG20C （相同外形與佔位） — 差異在於 Core Architecture, DMA Channels, RoHS Status, Data Bus Width, Maximum Clock Frequency.
NXP Semiconductors
Core Architecture: M68000 (32-bit programming model, 8/16-bit external data bus)
DMA Channels: Yes (multi-channel)
Maximum Clock Frequency: 16 MHz
比較對象 MC68302AG20C →
NXP Semiconductors
Core Architecture: M683xx
RoHS Status: Compliant (factory statement)
Data Bus Width: 8/16 bit
比較對象 MC68302AG20C →
NXP Semiconductors
DMA Channels: 3 (memory-to-memory, peripheral-to-memory, memory-to-peripheral)
RoHS Status: RoHS Compliant
比較對象 MC68302AG20C →
NXP Semiconductors
Core Architecture: 32-bit internal / 16-bit external data bus
RoHS Status: RoHS Compliant
Data Bus Width: 8/16-bit
比較對象 MC68302AG20C →
MC68302AG16C
✅ 直接替換NXP Semiconductors
📦 144-LQFP
M68000 (32-bit programming model, 8/16-bit external data bus) · M683xx / ColdFire-class M68000 · 16 MHz · 5 V · 144-pin LQFP (20x20 mm) · Surface Mount · 1 · 8/16-bit external / 32-bit internal
聯絡詢價
查看資料表 →MC68302CFC20C
✅ 直接替換📦 144-LQFP
same die, ceramic-package industrial grade variant
📋 參考替代品（不在目錄中）
MC68302AG20C 最大額定值與電氣特性
| Core Architecture | M68000 / M68300 family |
| 資料匯流排寬度 | 8/16-Bit external |
| Maximum CPU Clock | 20 MHz |
| Address Bus Width | 24-Bit (16 MB linear) |
| Core Count | 1 |
| On-Chip RAM | 1152 bytes dual-port |
| Serial Communications Controllers | 3 SCCs (HDLC/SDLC, UART, BISYNC) |
| DMA Channels | 2 |
| External Interrupts | Up to 7 sources |
| 供應電壓 | 5 V |
| 封裝 | 144-LQFP (20x20 mm) |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant |
| Lead-Free | Yes |
MC68302AG20C 144-lqfp (20x20 mm) 腳位配置指南
MC68302AG20C（144-lqfp (20x20 mm) 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： MC68302AG20C.
請參閱 資料表 以查看完整腳位配置。
典型應用
MC68302AG20C 適用於 2 應用s: ISDN Terminal Adapter, Industrial Serial Router.
ISDN Terminal Adapter
The MC68302AG20C fits ISDN terminal adapters because its three on-chip serial communications controllers natively handle HDLC framing at the BRI S/T interface, and the 68000 core runs the higher-layer protocol stack without burdening bit-level work. Designers typically connect the SCC1 port directly to an external ISDN transceiver (Siemens PSB 2186 or equivalent), dedicating SCC2 and SCC3 to UART console and auxiliary data. The 20 MHz CPU clock provides enough headroom for full LAPD and PPP handling, while the 24-bit address bus maps the entire ISDN signalling memory space without bank switching. Compared with discrete 68000 plus separate SCC chip implementations, the integrated design reduces board area by roughly 40 percent and improves deterministic interrupt latency for real-time ISDN D-channel processing.
推薦
Industrial Serial Router
The MC68302AG20C's three SCCs allow simultaneous handling of three independent serial links (RS-232/RS-485) for protocol-conversion routing between fieldbus segments. The on-chip RISC communications processor offloads HDLC bit-stuffing and CRC, freeing the 68000 core for routing-table lookups and frame forwarding. Designers use DMA channel 1 to move received SCC frames directly into external SRAM, while the second DMA channel services the transmit side, achieving wire-speed throughput on 38.4 kbps to 2 Mbps serial links. The 1152-byte dual-port RAM is shared with the on-chip communications processor for descriptor passing. The 144-LQFP plastic package supports -40C to +85C industrial temperature operation as documented in NXP legacy datasheets.
推薦產品摘要
PSB2186
ISDN S/T transceiver companion 用於： ISDN Terminal Adapter
MC145572
ISDN U-interface transceiver 用於： ISDN Terminal Adapter
What is the operating voltage of MC68302AG20C?
The MC68302AG20C operates from a single 5 V supply on its VCC pins. According to the NXP MC68302 datasheet, the device is specified for 5.0 V +/- 5 percent tolerance and requires proper bulk and high-frequency decoupling close to each VCC/GND pair on the 144-LQFP package.
What is the maximum CPU clock speed of MC68302AG20C?
The MC68302AG20C runs at a maximum CPU clock of 20 MHz. The 'G20' designator in the part number explicitly signals the 20 MHz speed grade. Lower-cost variants such as MC68302AG16C exist for 16 MHz applications where bus timing margin is more comfortable.
Is MC68302AG20C still in production?
The NXP MC68302 family is in end-of-life status per the NXP product page, and remaining inventory is sold through authorised distributors and the open market. New designs should target a modern NXP ColdFire or Kinetis replacement unless exact register-level compatibility is required for legacy code.
Where can I buy MC68302AG20C online?
MC68302AG20C is available from authorised distributors and independent stockists including DigiKey, Mouser, Octopart-listed vendors, Xecor, and Microchip-Price, with pricing shown above as of 2026-10-16. Stock levels vary because the part is in end-of-life; lead times can extend if distributors run out of factory-direct inventory.
What is the price of MC68302AG20C?
Pricing for MC68302AG20C starts at approximately 78.50 USD per unit at qty 1, descending to 54.10 USD at qty 1000, as of 2026-10-16 across surveyed distributors. End-of-life pricing has risen due to constrained allocation; always request a fresh quote before committing to a BOM.
What is the lead time for MC68302AG20C?
Lead time for MC68302AG20C is currently stock-dependent rather than factory-scheduled, because the part is end-of-life at NXP. Distributors showing immediate stock ship same day; if stock is depleted the next allocation is uncertain and may require an open-market broker with extended delivery.
What is the difference between MC68302AG20C and MC68302AG16C?
The MC68302AG20C runs at 20 MHz maximum CPU clock, while the MC68302AG16C runs at 16 MHz. Both share the same 144-LQFP package, the same on-chip peripherals (three SCCs, two DMA channels, 1152 bytes RAM), and identical pinout, making them drop-in compatible at the board level.
What is the difference between MC68302AG20C and MC68302PV20C?
The MC68302AG20C comes in a 144-pin LQFP plastic package, while the MC68302PV20C uses a 144-pin PGA ceramic package for extended temperature or military use. Both run at 20 MHz and share the same internal M68302 die, but the LQFP and PGA land patterns are not interchangeable.
Is MC68302AG20C pin-compatible with MC68332ACAG20?
No, the MC68302AG20C (LQFP-144) and the MC68332ACAG20 (LQFP-144) are NOT pin-compatible despite sharing package style, because the MC68302 is a communications-oriented part with different peripheral mappings than the MC68332 microcontroller. Software written for the 68302 will not run unmodified on the 68332.
What protocol support does the MC68302AG20C offer?
The MC68302AG20C includes three serial communications controllers supporting HDLC, SDLC, UART, and BISYNC protocols, plus an on-chip RISC communications processor for bit-level handling. This makes it well suited for ISDN terminal adapters, X.25 switches, and HDLC-based industrial networking applications.
Where can I download the MC68302AG20C datasheet PDF?
The official NXP MC68302 datasheet PDF can be downloaded from https://www.nxp.com/docs/en/data-sheet/MC68302.pdf or via the part page at https://www.nxp.com/part/MC68302AG20C. Third-party mirrors also exist on distributor sites such as microchip-price.com and Mouser.
What is the pinout of MC68302AG20C?
The MC68302AG20C pinout is defined across 144 pins in the LQFP-144 (20x20 mm) package, and includes multiple VCC/GND pairs, three SCC port groups, the 24-bit address bus, 16-bit data bus, DMA request/acknowledge lines, timer I/O, interrupt inputs, and the 20 MHz CLK input. Refer to the NXP datasheet for the exact pin-by-pin table.
What is the best drop-in replacement for MC68302AG20C?
The best drop-in replacement for the MC68302AG20C in the same 144-LQFP footprint is the MC68302AG16C (16 MHz variant of the same die) for designs that can accept lower clock, or the MC68302CFC20C ceramic-package variant if a non-plastic LQFP package is acceptable. For new designs, NXP ColdFire MCF5272 is the modern functional successor but requires firmware port.
Is MC68302AG20C RoHS compliant?
Yes, the MC68302AG20C is RoHS compliant and lead-free per distributor listings as of 2026-10-16. The 'G' suffix in the part number traditionally indicates the lead-free / RoHS-compliant package option in the M68302 family nomenclature.
What can replace MC68302AG20C in a new design?
For new designs, the recommended functional replacement for the MC68302AG20C is the NXP ColdFire MCF5272 (or MCF5270/5271 family), which provides a 68000-compatible instruction subset with integrated Ethernet MACs and SCC-equivalent serial ports. If strict 68000 register compatibility is required, the MC68302AG16C in the same LQFP-144 footprint is the closest drop-in.
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