BCM5389IFB

Overview

The BCM5389IFBG is an eight-port Gigabit Ethernet switch controller featuring integrated SerDes interfaces and nine MACs. It utilizes a non-blocking 9-Gigabit Ethernet switch fabric with a 128-KB packet buffer memory. The device operates on a low-power 0.13 µm 1.2 V CMOS core, consuming less than 1.5W of power. It supports up to 4k unicast MAC addresses and VLAN configurations. The ninth MAC provides GMII/RGMII/RvMII interfaces for CPU connection. The component is housed in a 256-pin FBGA package measuring 17 mm x 17 mm.

Feature Summary

• Integrates eight SGMII/SerDes interfaces and one GMII/RGMII/RvMII interface within a single chip.
• Supports advanced traffic management including 802.1p QoS, DiffServ priority queues, and port-based rate control.
• Enables flexible network segmentation through support for up to 4k VLANs and MAC-based port aggregation.
• Facilitates high-performance server connections via jumbo frame support and automatic address learning.

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 ordering suffix against official Broadcom documentation to confirm package type and temperature range. Confirm availability status as this component may be subject to lifecycle changes or limited distribution channels. Ensure compliance with RoHS directives prior to integration into final assemblies.

Selection Notes

Select this component when designing cost-effective Gigabit Ethernet switches requiring integrated SerDes for backplane or fiber connections. It is suitable for applications needing managed features like Spanning Tree or unmanaged plug-and-play setups without external CPUs. Consider the 256-pin FBGA package constraints during PCB layout.

Part Context

The BCM5389 belongs to Broadcom's eighth-generation SwitchC series, designed to reduce system complexity by integrating switch fabric, packet buffering, and PHY interfaces. It serves as a direct replacement for previous generation controllers requiring separate SerDes components, offering improved reliability by eliminating fans and reducing board layer counts.

Replacement Considerations

The BCM5389KFBG is a confirmed substitute part number with identical functional specifications. Verify pinout compatibility and thermal requirements before substitution. No other cross-model replacements are documented in the provided source material.