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AM79C98PC データシート(PDF) 1 Page - Advanced Micro Devices

部品番号 AM79C98PC
部品情報  Twisted-Pair Ethernet Transceiver (TPEX)
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メーカー  AMD [Advanced Micro Devices]
ホームページ  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM79C98PC データシート(HTML) 1 Page - 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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