MC68302CEH20C

The MC68302CEH20C is an integrated microprocessor from NXP Semiconductors in the MC68302 family combining an MC68000/MC68008 core with a dedicated communications processor and system integration block. It targets embedded networking and communications designs that require on‑chip protocol handling, DMA, and flexible serial interfaces.

With a 20 MHz core clock, single 8/16‑bit M68000 processor, on‑chip dual‑port RAM and multiple serial controllers, the device is optimized for applications such as ISDN, line cards, gateways and modems where integration, deterministic I/O and industrial temperature operation are important.

Key Features

• Core — MC68000/MC68008 microprocessor core operating at 20 MHz; CPU core can be disabled to use the IMP as a peripheral.
• Communications Processing — Separate RISC communications processor (CP) with three Serial Communications Controllers (SCCs) and two Serial Management Controllers (SMCs) to handle multiple protocol stacks concurrently.
• Serial Protocol Support — SCCs support HDLC/SDLC, Bisync, UART, DDCMP, V.110 and totally transparent modes for flexible link-level operation.
• DMA and Buffering — Six serial DMA channels dedicated to SCCs and capability to send/receive multiple buffers/frames without M68000 intervention; independent Direct Memory Access (IDMA) controller.
• On‑Chip Memory — 1,152‑byte dual‑port RAM with programmable address mapping for shared CPU/CP access.
• System Integration — System integration block (SIB) includes interrupt controller (two modes), parallel I/O (some with interrupts), three timers with software watchdog, programmable chip‑selects with wait‑state logic and DRAM refresh controller.
• Peripheral Control — Four programmable chip‑select lines, on‑chip clock generator with output clock signal, hardware watchdog and freeze control for debugging selected peripherals.
• Package and Mounting — 132‑pin PQFP surface‑mount package, 46×46 mm footprint (132‑PQFP); 132‑BQFP bumpered package option noted.
• Power and I/O — 5 V I/O signaling.
• Operating Range — Industrial temperature rating: −40 °C to 85 °C.

Typical Applications

• ISDN Equipment — Handles multi‑channel serial protocols and provides integrated protocol handling suitable for ISDN basic rate and terminal adapter designs.
• Data Concentrators — On‑chip DMA, multiple SCCs and dual‑port RAM simplify aggregation of serial links and local buffering.
• Modems and Line Cards — Integrated communications processor and protocol support reduce external logic for modem and line card interfaces.
• Network Bridges and Gateways — Programmable communications interfaces, DMA and interrupt modes enable concurrent operation of different protocols for gateway tasks.

Unique Advantages

• Highly integrated communications subsystem: Combines an M68000 core with a RISC communications processor, SCCs and SMCs to reduce external components and simplify board design.
• Reduced CPU intervention for data paths: Dedicated serial DMA channels and buffer handling allow multiple frames to be processed without continuous M68000 involvement.
• Flexible protocol support: SCCs support a wide range of link protocols (HDLC/SDLC, Bisync, UART, DDCMP, V.110) enabling reuse across different product designs.
• Robust system control: On‑chip watchdogs, interrupt controller, freeze control and DRAM refresh provide deterministic behavior and easier system-level management.
• Industrial temperature rating: Specified operation from −40 °C to 85 °C for deployment in temperature‑sensitive embedded and communications equipment.

Why Choose MC68302CEH20C?

The MC68302CEH20C positions itself as a compact, integrated solution for embedded communications products requiring protocol offload, deterministic I/O and on‑chip buffering. Its combination of an industry‑standard M68000 core, a dedicated communications processor, multiple serial controllers and DMA support simplifies system architecture and reduces BOM complexity.

This part is well suited for designers building ISDN equipment, data concentrators, modems, line cards, bridges and gateways who need a proven integrated processor with industrial temperature capability and flexible peripheral control. Long‑term value comes from the device’s integration of CPU, communications, memory and system control features that streamline development and deployment.

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