KMC68302EH25C

The KMC68302EH25C is a one‑chip microprocessor from the MC68302 series featuring an MC68000/MC68008 core paired with a dedicated RISC communications processor and system integration block. This 25 MHz device provides a tightly integrated architecture for embedded networking and communications designs.

Designed for multi‑channel communications, the device targets applications such as ISDN equipment, data concentrators, modems, line cards, bridges and gateways. Its value lies in combining CPU, communications processors and on‑chip peripherals to simplify system design and accelerate protocol handling.

Key Features

• Core — MC68000/MC68008 microprocessor core (single core, 8/16‑bit) running at 25 MHz with the ability to disable CPU logic for peripheral use.
• Communications Subsystem — Dedicated communications processor (RISC CPM) with three full‑duplex Serial Communications Controllers (SCCs) and two Serial Management Controllers (SMCs) for IDL and GCI channels.
• Protocol Support — SCCs support HDLC/SDLC, Bisync, UART, DDCMP, Totally Transparent protocols and V.110, enabling multi‑protocol operation in a single device.
• Memory & DMA — On‑chip 1,152‑byte dual‑port RAM plus an Independent Direct Memory Access (IDMA) controller and six serial DMA channels to move data with minimal CPU intervention.
• System Control & Timers — Interrupt controller with two modes, three timers including a software watchdog, hardware watchdog for bus monitoring, and four programmable chip‑select lines with wait‑state logic.
• Interfaces — Flexible physical interfaces accessible by SCCs for Inter‑chip Digital Link (IDL), General Circuit Interface (GCI), Pulse Code Modulation (PCM) and Non‑multiplexed Serial Interface (NMSI); includes a Serial Communication Port (SCP) for synchronous communication.
• DRAM & Clock — Integrated DRAM refresh controller and on‑chip clock generator with an output clock signal for system timing.
• Package & Power — Surface‑mount 132‑pin PQFP package (46×46 mm) with 5 V I/O and operating temperature range of 0 °C to 70 °C; RoHS compliant.

Typical Applications

• ISDN Equipment — Configurable support for ISDN basic rate and terminal adapter applications where multi‑protocol serial communications are required.
• Data Concentrators — Aggregates multiple serial links using on‑chip DMA and dual‑port RAM to reduce CPU overhead and simplify data routing.
• Modems — Handles protocol framing and serial line interfaces via SCCs and CPM offload for efficient line‑level processing.
• Line Cards — Provides integrated communications controllers, timers and chip‑select logic for compact line card implementations.
• Network Bridges & Gateways — Enables concurrent operation of different protocols and flexible interfacing for protocol conversion and traffic management.

Unique Advantages

• Highly integrated CPU + Communications — Combines an MC68000 core with a RISC communications processor and multiple SCCs to reduce external components and simplify BOM.
• Multi‑protocol capability — Built‑in support for HDLC/SDLC, Bisync, UART, DDCMP and V.110 allows a single device to handle diverse serial protocols.
• Efficient data movement — IDMA, six serial DMA channels and on‑chip dual‑port RAM enable high throughput with reduced CPU intervention.
• Flexible physical interfaces — SCC access to IDL, GCI, PCM and NMSI provides versatility when integrating with different link types and system topologies.
• Robust system control — Watchdog timers, interrupt modes, programmable chip‑selects and DRAM refresh controller support reliable embedded operation.
• Form factor and compliance — 132‑pin PQFP surface‑mount package (46×46 mm) with 5 V I/O and RoHS compliance for standard embedded assembly flows.

Why Choose KMC68302EH25C?

The KMC68302EH25C is positioned for embedded networking and communications designs that require a combined CPU and communications engine in a single device. With a 25 MHz MC68000 core, dedicated RISC communications processor, multi‑protocol serial controllers and on‑chip DMA and RAM, it reduces external logic and accelerates protocol handling.

This device suits system designers building ISDN units, modems, data concentrators, line cards and gateways who need a compact, specification‑driven solution. Built‑in system control features, watchdogs and standard temperature and voltage ratings provide a clear baseline for predictable embedded deployments, and the device is RoHS compliant.

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