GENERAL DESCRIPTION

The MB86961A Universal Interface for 10BASE-T (Twisted-Pair) Ethernet is fully compliant with the IEEE 802.3 specifications for AUI (Attachment Unit Interface) and 10BASE-T (Twisted-Pair) interfaces and provides the electrical interface between an Ethernet controller and the DB15 (AUI) and RJ45 (10BASE-T) connections to an Ethernet local area network. Functions provided by the MB86961A include Manchester encoding and decoding of the serial data stream, level conversion, collision detection, signal quality error (SQE) and link integrity testing, jabber control, loopback, and automatic correction of polarity reversal on the twisted-pair input.

FEATURES

• Full-duplex capability

• Combines Manchester encoder/decoder and twisted pair transceiver functions

• Direct interface to all popular Ethernet controllers

• Direct interface to AUI and 10BASE-T outputs

• Manual or automatic AUI /10BASE-T selection

• Integrated pulse shaper and Tx/Rx filters

• Selectable 100 Ω/150 Ω termination permits operation with shielded or unshielded twisted pair cable

• Reverse-polarity detection for receiver with automatic correction

• On-chip jabber logic, SQE test and link test with enable/disable option

• Remote signaling of link down and jabber conditions

• Programmable receive threshold for extended range

• Output drivers for receive, transmit, collision and link test pass LED indicators

• TP loopback enable/disable for external loopback testing

• Power down mode for minimum power dissipation

• Automatic shut-down of unused port to reduce power consumption

• Low power CMOS technology, single 5 volt power supply

• 44-pin PLCC and 48-pin PQFP packages