MC68302FC20C

Microprocessors Overview

The MC68302FC20C is an Integrated Multiprotocol Processor (IMP) featuring a closely coupled MC68000/MC68008 microprocessor core and a flexible communications architecture. It operates at a maximum clock frequency of 20 MHz within a PQFP-132 package. The device includes 1152 bytes of on-chip dual-port static RAM, three Serial Communication Controllers (SCCs), two Serial Management Controllers (SMCs), and three timers. It supports protocols such as HDLC/SDLC, Bisync, UART, DDCMP, and Totally Transparent modes.

Microprocessors Feature Summary

• Integrates an industry-standard MC68000/MC68008 microprocessor core with a dedicated RISC-based Communications Processor for efficient protocol handling.
• Provides three full-duplex Serial Communication Controllers supporting multiple data link protocols including HDLC/SDLC, Bisync, and UART.
• Includes two Serial Management Controllers designed for Inter-Chip Digital Link (IDL) and General Circuit Interface (GCI) channel management.
• Features an Independent Direct Memory Access controller and six serial DMA channels to enable buffer processing without CPU intervention.

Microprocessors Applications

• ISDN equipment
• Data concentrators
• Modems
• Line cards
• Network bridges

Microprocessors Procurement Notes

Verify the specific suffix FC20C against official NXP documentation to confirm pin compatibility and thermal specifications. Confirm availability status as this component may be discontinued or superseded by newer iterations within the MC68302 family. Ensure design-in compliance with legacy support requirements if sourcing from secondary markets.

Microprocessors Selection Notes

Select this component when designing networking hardware requiring concurrent operation of different communication protocols. The integrated architecture reduces external component count by combining the processor core, system integration block, and communications peripherals on a single chip. Evaluate the 1152-byte dual-port RAM capacity against application buffering needs.

Microprocessors Part Context

The MC68302 belongs to the Motorola/Freescale/NXP IMP family, pioneering the integration of a standard microprocessor core with specialized communications logic. This architecture was developed to address the complexity of networking controllers in the telecommunications industry, specifically for ISDN basic rate applications.

Microprocessors Replacement Considerations

MC68EN302: Offers Ethernet compliance and dynamic bus sizing but requires a 144-pin TQFP package.

Microprocessors FAQ

Can the MC68000 core be disabled?

Yes, the MC68000/MC68008 microprocessor core can be disabled to allow the IMP to function solely as a peripheral device.

What physical interfaces do the SMCs support?

The two Serial Management Controllers support Inter-Chip Digital Link (IDL) and General Circuit Interface (GCI) channels.