AM79C989 Datasheet PDF

Advanced Micro Devices AM79C989

The Am79C989 Quad Ethernet Switching Transceiver (QuEST™) is a four-port physical layer (PHY) device that provides all of the analog functions needed for a 10BASE-T switch, including four independent Manchester Encode/Decode units (MENDECs) and four independent 10BASE-T transceivers. The QuEST device is designed for 10 Mbps Ethernet switching hubs, port switching repeater hubs, routers, bridges, and servers that require data encoding and clock recovery on a per port basis and are limited by pin constraints. The QuEST device supports every physical layer function of a full-featured switch, including full-duplex operation with Auto-Negotiation and the ability to use various media types.