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DUAL SERIAL TRANSCEIVER (DST)

A block diagram of a typical application is shown in Figure 1. The 82503 Dual Serial Transceiver is a high-inte gration CMOS device designed to simplify interfacing industry standard Ethernet LAN Controllers to IEEE 802.3 local area network applications (10BASE5, 10BASE2, and 10BASE-T). The component supports both an attachment unit interface (AUI) and a Twisted Pair Ethernet interface (TPE). It allows OEMs to design a state-of-the-art media interface that is jumperless and fully automatic. The 82503 includes on-chip AUI and TPE drivers and receivers; it offers designers a cost-effective, integrated solution for interfacing LAN control lers to the wire medium.

82503 PRODUCT FEATURE SET OVERVIEW

■ Single Component Ethernet* Interface to Both 802.3 10BASE-T and AUI

■ Automatic or Manual Port Selection

■ Manchester Encoder/Decoder and Clock Recovery

■ No Glue Interface to Industry-Standard LAN Controllers

— Intel 82586, 82590, 82593 and 82596

— AMD 7990 (LANCE*)

— National Semiconductor 8390 and 83932 (SONIC*)

— Western Digital 83C690

— Fujitsu 86950 (Etherstar*)

■ Diagnostic Loopback

■ Reset, Low Power Modes

■ Network Status Indicators

■ Defeatable Jabber Timer

■ User Test Modes

■ 10 MHz Transmit Clock Generator

■ One Micron CHMOS** IV (Px48) Technology

■ Single 5-V Supply

INTERFACE FEATURES

TPE

■ Complies with 10BASE-T, IEEE Std.

802.3i-1990 for Twisted Pair Ethernet

■ Selectable Polarity Switching

■ Direct Interface to TPE Analog Filters

■ On-Chip TPE Squelch

■ Defeatable Link Integrity (LI)

■ Support of Cable Lengths l100m

AUI

■ Complies with IEEE 802.3 AUI Standard

■ Direct Interface to AUI Transformers

■ On-Chip AUI Squelch