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The RTL8309M-VB-CG is a network switch IC manufactured by REALTEK. Below are its specifications, descriptions, and features:

Specifications:

• Manufacturer: REALTEK
• Model: RTL8309M-VB-CG
• Type: 9-port Fast Ethernet Switch Controller
• Interface: MII/RMII
• Data Rate: 10/100Mbps per port
• Port Count: 9 ports (8 LAN ports + 1 uplink port)
• MAC Address Table: 1K entries
• Packet Buffer Memory: 128KB
• Power Supply: 3.3V
• Package: LQFP (Low-profile Quad Flat Package)
• Operating Temperature: Commercial (0°C to 70°C) or Industrial (-40°C to 85°C) options

Descriptions:

The RTL8309M-VB-CG is a highly integrated 9-port Fast Ethernet switch controller designed for cost-effective networking applications. It supports auto-negotiation, auto-MDI/MDIX, and QoS prioritization, making it suitable for small office/home office (SOHO) and industrial networking environments.

Features:

• 9-port Fast Ethernet switch (8 LAN ports + 1 uplink port)
• Supports 10/100Mbps operation on all ports
• Auto-negotiation and auto-MDI/MDIX for easy cable connection
• IEEE 802.3x flow control (full-duplex) and backpressure (half-duplex)
• VLAN support for network segmentation
• QoS (Quality of Service) with 4 priority queues
• 1K MAC address table for efficient forwarding
• 128KB packet buffer for traffic management
• Low power consumption design
• MII/RMII interface for flexible PHY connections
• LQFP package for compact PCB design

This IC is commonly used in Ethernet switches, routers, and embedded networking devices.

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