AM79C98JC datasheet(1/22 Pages) AMD

Teilenummer	AM79C98JC

Bauteilbeschribung	Twisted-Pair Ethernet Transceiver (TPEX)

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Hersteller	AMD [Advanced Micro Devices]

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FINAL

Publication# 14395

Rev: D Amendment/0

Issue Date: May 1994

1

Am79C98

Twisted-Pair Ethernet Transceiver (TPEX)

DISTINCTIVE CHARACTERISTICS

s CMOS device provides compliant operation and

low operating current from a single +5 V supply

s Power Down mode provides reduced power

consumption for battery-powered applications.

Reset capability allows use in remote MAU

applications.

s Pin-selectable twisted-pair receive polarity

detection and automatic inversion of the receive

signal. Polarity indication output pin can

directly drive an LED.

s Pin-selectable twisted-pair Link Integrity Test

capability conforming to the IEEE 802.3

standard for 10BASE-T. Link status pin can

directly drive an LED.

s Internal twisted-pair transmitter digital

predistortion circuit reduces medium-induced

jitter and ensures compliance with the

10BASE-T transmit and receive waveform

requirements

s Pin-selectable SQE Test (heartbeat) enable

s Transmit and receive status indications are

available on separate, dedicated pins

s AUI loopback, Jabber Control, and SQE Test

functions comply with the 10BASE-T standard

IEEE Std 802.3i-1990

GENERAL DESCRIPTION

The Am79C98 Twisted-Pair Ethernet Transceiver

(TPEX) is an integrated circuit that implements the

medium attachment unit (MAU) functions for the

twisted-pair medium, as speciﬁed by the IEEE 802.3

standard (Type 10BASE-T). This device provides the

necessary electrical and functional interface between

the IEEE 802.3 standard attachment unit interface

(AUI) and the twisted-pair cable.

A network based on the 10BASE-T standard can use

unshielded twisted-pair cables, providing an economi-

cal solution to networking by allowing the use of exist-

ing telephone wiring. The Am79C98 provides a minimal

component count and cost-effective solution to the

design and implementation of 10BASE-T standard

networks.

TPEX provides twisted-pair driver and receiver circuits,

including on-board transmit digital predistortion, re-

ceiver squelch, and an AUI port with pin-selectable

SQE Test enable. The device also provides a number of

additional features, including pin-selectable Twisted-

Pair Receive Polarity Detection and Automatic Polarity

Reversal, Link Status indication, Link Test disable func-

tion, and transmit and receive status. The Twisted-Pair

Polarity and Link Status pins can be used to drive LEDs

directly.

The Am79C98 is fabricated in CMOS technology and

requires a single +5 V supply. The device is available in

24-pin SKINNYDIP® plastic dual in-line and 28-pin

plastic leaded chip carrier (PLCC) packaging.

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