AM79C30AJC/D

Overview

The AM79C30AJC/D is a Digital Subscriber Controller (DSC) manufactured by Advanced Micro Devices. It integrates an ISDN S/T-interface transceiver, D-channel LAPD processor, audio processor, and IOM-2 interface into a single CMOS chip. The device supports CCITT I-series recommendations for S and T reference points, enabling compliant terminal equipment design. Key features include level 1 physical layer control with multiframe support, D-channel processing with CRC checking and FIFO buffers, and audio capabilities such as codec/filter selection and programmable gain. It operates in TTL-compatible logic levels.

Feature Summary

• Integrates ISDN S/T-interface transceiver, D-channel LAPD processor, audio processor, and IOM-2 interface
• Supports CCITT I.430 power-compliant terminal equipment operation modes
• Provides D-channel processing including flag generation, CRC checking, and zero insertion/deletion
• Includes audio processing registers for software-based speaker phone algorithms and dual audio inputs

Applications

• ISDN terminal equipment design conforming to international standards
• Point-to-point or passive bus configurations for S/T interfaces
• Implementation of software-based speaker phone systems

Procurement Notes

Verify the specific suffix (JC vs JD) against official AMD documentation to confirm package type and temperature range. Ensure compatibility with required CCITT I-series standards for the target application. Confirm pinout alignment if replacing legacy components. Check for end-of-life status given the component's age. Validate supply chain authenticity through authorized distributors.

Selection Notes

Select this component when a single-chip solution for ISDN DSC functionality is required. It combines physical layer transceiver and data link processing, reducing board space. Consider the integrated audio processor if speakerphone features are needed. Verify voltage levels match the system's TTL requirements. Evaluate alternative ISDN controllers if higher integration or different interface standards are necessary.

Part Context

The AM79C30A belongs to Advanced Micro Devices' family of ISDN controller chips, designed to simplify the implementation of Integrated Services Digital Network terminals. It addresses the need for compact, low-power solutions that handle both data link layer protocols and physical layer signaling. This series was prominent in early ISDN infrastructure and consumer electronics requiring digital subscriber line connectivity.

Replacement Considerations

Publicly confirmed substitute part numbers for the AM79C30AJC/D are not available in the provided source material. Engineers should consult current AMD or third-party datasheets for direct replacements or functional equivalents.