78Q8430-100IGT/F

Overview

The Teridian 78Q8430 is a single-chip 10/100 Fast Ethernet controller integrating an IEEE-802.3 compliant MAC and PHY, optimized for host processor offloading in multimedia applications. It features a non-PCI pseudo-SRAM Host Bus Interface supporting 8-bit, 16-bit, and 32-bit data bus widths with big/little endian support. The device includes adaptive 32 kB SRAM FIFO memory allocation between transmit and receive paths, queue-independent user-settable watermarks, and per-queue status indication. It supports Auto MDI-X, Auto Negotiation, full/half duplex operation, and IEEE 802.3x flow control. Available in a 100-pin LQFP package, it operates within an industrial temperature range of -40 °C to +85 °C.

Feature Summary

• Integrates a 10Base-T/100Base-TX MAC and PHY with adaptive 32 kB SRAM FIFO memory allocation between Tx and Rx paths.
• Features a non-PCI pseudo-SRAM Host Bus Interface supporting 8-bit, 16-bit, and 32-bit bus widths with asynchronous (100 MHz) and synchronous (50 MHz) clock support.
• Includes an Address Resolution Controller (ARC) providing multiple perfect address filtering, wildcard address filtering, and positive/negative filtering modes.
• Supports traffic offload functions including APF & ICMP Echo frame transfer, IP Firewall configuration, and IP Checksum.

Applications

• Satellite, cable and IPTV Set Top Boxes
• Multi Media Residential Gateways
• High Definition 1080p/1080i DTVs
• IP-PVR and video distribution systems
• Digital Video Recorders/Players

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type, temperature range, and lead-free compliance status. Ensure the component matches the required interface timing specifications for your host system. Cross-reference the datasheet revision date to confirm the accuracy of electrical characteristics and pin descriptions before finalizing procurement orders.

Selection Notes

Select this component when low host CPU utilization and high throughput are critical for mixed-media applications. Verify that the host processor can interface with the pseudo-SRAM bus architecture and supports the required bus widths. Confirm that the application environment falls within the specified industrial temperature range and that the available power management features align with system energy requirements.

Part Context

The 78Q8430 was originally manufactured by Teridian Semiconductor Corporation and later acquired by Maxim Integrated, which is now part of Analog Devices Inc. This component serves as a specialized Ethernet controller designed to reduce processing overhead on host CPUs in demanding multimedia environments. It represents a dedicated solution for integrating 10/100 Mbps connectivity into devices requiring efficient packet handling and media streaming capabilities.

Replacement Considerations

Consult the official Analog Devices or Maxim Integrated replacement matrix for verified substitute part numbers. Ensure any alternative component maintains compatibility with the pseudo-SRAM host interface and meets the same IEEE 802.3 standards compliance requirements.