RTL8305SC-LF

Product Summary

The RTL8305SC-LF is a 5-port Fast Ethernet switch controller that integrates memory, five MACs, and five physical layer transceivers for 10Base-T and 100Base-TX operation into a single chip. All ports support 100Base-FX, which shares pins (TX+-/RX+-) with UTP ports and needs no SD+/- pins, a development using Realtek proprietary technology. To compensate for the lack of auto-negotiation in 100Base-FX applications, the RTL8305SC-LF can be forced into 100Base-FX half or full duplex mode, and can enable or disable flow control in fiber mode. The five ports are separated into three groups (GroupX/GroupY/Port4) for flexible port configuration using strapping pins upon reset. The SetGroup pin is used to select port members in GroupX and GroupY. When the port members have been determined, you may use a mode selection pin (GxMode/Gymode/P4Mode[1: 0]) to select operating interfaces such as 10/100Base-TX, 100Base-FX. Each group has four pins for selecting initial port status upon reset (ANEG/Force, 100/10, Full/Half, Enable/Disable Flow Control). Upon reset, in addition to using strapping pins, a CPU can also configure the RTL8305SC-LF via the MDC/MDIO interface.

Parametrics

RTL8305SC-LF absolute maximum ratings: (1)Vcc Supply Referenced to GND: -0.5 to +4.0 V; (2)Digital Input Voltage: -0.5 to VDD V; (3)DC Output Voltage: -0.5 to VDD V; (4)Storage Temperature: -55 to +150 ℃; (5)Ambient Operating Temperature (Ta): 0 to +70 ℃; (6)3.3V Vcc Supply Voltage Range (HVDD33, DVDD33): 3.15 to 3.45 V; (7)1.8V Vcc Supply Voltage Range (DVDD18, AVDD18): 1.71 to 1.95 V.

Features

RTL8305SC-LF features: (1)Supports SMI (Serial Management Interface: MDC/MDIO)for programming and diagnostics; (2)Supports loop detection function with one LED to indicate the existence of a loop; (3)Supports MAC and PHY loopback function for diagnosis; (4)Supports up to 16 VLAN groups; (5)Flexible 802.1Q port/tag-based VLAN; (6)ARP VLAN for broadcast packets; (7)Leaky VLAN for unicast packets; (8)VLAN tag Insert/Remove function; (9)Supports the fifth port MAC circuit as PHY mode MII, SNI for router applications, and MAC mode MII for HomePNA or VDSL solutions; (10)Supports the fifth port PHY circuit as PHY mode MII for router and Gateway applications; (11)All ports support 100Base-FX with optional flow control enable/disable and full/half-duplex setting; (12)Supports FEFI function for fiber application; (13)Non-blocking wire-speed reception and transmission and non-head-of-lineblocking forwarding; (14)Fully compliant with IEEE 802.3/802.3u auto-negotiation function.

Diagrams