MC68302CRC20C

Microprocessors Overview

The MC68302CRC20C is an Integrated Multiprotocol Processor (IMP) featuring a closely coupled MC68000/MC68008 microprocessor core and a flexible communications architecture. It integrates a System Integration Block (SIB) and a Communications Processor (CP). Key specifications include a maximum clock frequency of 20 MHz, 1152 bytes of on-chip dual-port RAM, three Serial Communications Controllers (SCCs), two Serial Management Controllers (SMCs), and three timers. The device operates at 5 V with an operating temperature range of 0°C to +70°C.

Microprocessors Feature Summary

• Integrates an industry-standard MC68000/MC68008 core with a dedicated RISC processor for handling communications tasks.
• Supports concurrent operation of multiple protocols including HDLC/SDLC, Bisync, UART, DDCMP, and Totally Transparent modes via three SCCs.
• Includes an Independent Direct Memory Access (IDMA) controller and six serial DMA channels to enable data transfer without CPU intervention.
• Features a System Integration Block with bus arbitration logic, hardware watchdog, DRAM refresh controller, and programmable chip-select lines.

Microprocessors Applications

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

Microprocessors Procurement Notes

Verify the specific suffix CRC20C against official NXP documentation to confirm pinout compatibility and package type. Confirm current availability status as legacy components may have limited supply chains. Ensure environmental compliance requirements match the intended deployment region. Validate that the 20 MHz speed grade meets system timing constraints before finalizing procurement.

Microprocessors Selection Notes

Select this component when designing networking products requiring simultaneous protocol handling. The integrated architecture reduces external component count compared to discrete solutions. Consider the 1152-byte RAM capacity for buffer management needs. Evaluate the available third-party tool support for development efficiency. Verify interface requirements against the supported IDL, GCI, PCM, and NMSI physical interfaces.

Microprocessors Part Context

The MC68302 family represents an early integration of a general-purpose microprocessor core with specialized communications peripherals. It was designed to simplify the design of controllers for the communications industry. The IMP architecture allows for efficient handling of network traffic by offloading protocol processing from the main CPU core to the dedicated communications processor.

Microprocessors Replacement Considerations

Public confirmed substitute part numbers are not provided in the source material. Consult NXP technical support for cross-reference information regarding newer generations or compatible devices within the MC68302 family derivatives such as the MC68EN302 or MC68QH302 if architectural differences are acceptable.