BCM5389IFBG

Overview

The Broadcom BCM5389IFBG is an eighth-generation switch-on-chip designed for standalone Gigabit Ethernet switches and control plane applications. It integrates eight SGMII/SerDes interfaces, nine IEEE-compliant MACs, and a non-blocking 9-Gigabit Ethernet switch fabric within a single 0.13 µm CMOS device. The component features a 128-KB packet buffer memory, supports up to 4k unicast MAC addresses, and includes four 802.1p QoS priority queues. Operating at a core voltage of 1.2 V with power consumption under 1.5 W, it utilizes a 256-pin FBGA package measuring 17 mm x 17 mm.

Feature Summary

• Integrates eight SerDes cores for direct backplane or fiber optic connections alongside nine compliant MACs supporting jumbo frames.
• Supports comprehensive traffic management including VLAN 4k 802.1Q, port-based rate control, Spanning Tree, and Rapid Spanning Tree protocols.
• Enables managed operation via SPI interface for configuration of QoS, DiffServ, and MIB counters without requiring external CPUs in unmanaged setups.

Applications

• Standalone Gigabit Ethernet switches for SOHO environments
• Gigabit Ethernet control plane and backplane applications
• Enterprise branch office connectivity solutions

Procurement Notes

Verify the specific suffix IFBG against official datasheets to confirm temperature range and packaging details. Confirm current availability status as distribution channels may vary. Ensure compliance with RoHS directives and moisture sensitivity levels prior to integration into manufacturing processes.

Selection Notes

Select this component when a highly integrated solution minimizing external components is required for Gigabit Ethernet deployments. It is suitable for designs needing low power consumption and fanless operation. Evaluate the need for managed versus unmanaged features based on SPI interface requirements and CPU availability.

Part Context

The BCM5389 belongs to Broadcom's eighth-generation SwitchC family, focusing on high integration and reduced system cost. It replaces multi-chip solutions by combining switching fabric, PHY interfaces, and MAC controllers into one die, facilitating smaller form factors for desktop and control plane networking hardware.

Replacement Considerations

Consult official Broadcom documentation for verified cross-reference part numbers. Ensure any substitute maintains compatibility with SGMII/SerDes interfaces and 1.2 V CMOS core specifications.

FAQ

How many MAC interfaces are integrated into the BCM5389?

The device integrates nine IEEE-compliant 10/100/1000 MACs, with eight connected internally to SerDes cores and one featuring GMII/RGMII/RvMII modes for CPU connection.

What is the maximum packet buffer size available?

The BCM5389 provides a 128-KB packet buffer memory to handle data transmission efficiently.

Does the chip support jumbo frames?

Yes, the integrated MACs support 9-KB jumbo frames, which reduce overhead for high-performance connections to servers.