MC68835 판매점 - Twisted Pair Interface

www.DMatOaSTheOet4RUO.coLmA

SEMICONDUCTOR TECHNICAL DATA

Order this data sheet

from Logic Marketing

Product Preview

Twisted Pair Interface

for FDDI Local Area Networks

MC68835

Overview

The FDDI is a LAN standard under ANSI auspices. The standard

supports a 100 Mbps fiber–optic–based token ring with up to 1000

stations; total ring length should not exceed 200 Km with up to 2 km

between stations. FDDI over twisted–pair cable is also supported by the

TP–PMD standard. The twisted pair cable connecting two stations can be

up to 100 meters in length. Users are encouraged to refer to the pertinent

ANSI standard documents for further information.

Introduction

The MC68835 Twisted–Pair Interface chip (TPIC) is a transceiver

capable of transmitting and receiving MLT3 or NRZI encoded data

streams, as well as handling clock and data recovery. The TPIC

FA SUFFIX

TQFP PACKAGE

CASE 931–02

implements the lower portion of the Physical layer (PHY) functions of the

FDDI standard. It performs a five–bit parallel to serial conversion during

transmission, as well as a five–bit serial to parallel conversion during

reception. The TPIC uses the five–bit parallel interface to communicate with the MC68837 Elastic Buffer and Link Manager

(ELM) device or other Motorola FDDI devices that incorporate the ELM function internally, such as the 68840 IFDDI, 68848

CAMEL, or the 68847 Quad ELM.

MC68835 Features

• Supports Twisted Pair and Fiber Optic Media

• Supports MLT–3 Line Code in Twisted Pair Mode

• Supports NRZI Line Code in Fiber Mode

• Adaptive Receive Equalization supports TP line lengths of 0 to 100 meters

• Controlled Twisted Pair Output Transition Times May Eliminate Need for Transmit Filter

• TP Receiver Includes Circuitry Which Enables Error Free Reception of Data Distorted with Base Line Wander

• Twisted Pair and Fiber Transmitters Share Same IC pins. Twisted Pair and Fiber Receivers also Share Same IC Pins

• Twisted Pair or Fiber Optic Operation Selected with PORTSEL Input

• Twisted Pair (TP) Transceiver Complies with ANSI X3T9.5 TP–PMD FDDI Standard

• Meets Jitter Requirements of ANSI X3T9.5 TP–PMD

• Pseudo–ECL Interface For Fiber–Optic Media

• Digital Phase–Locked Loop (DPLL) Provides Run Length Immunity

• Transmit Off Capability for True Quiet Line State

• Uses a 25 Mhz External Frequency Reference

• Converts Received Serial Bit Stream to Five–Bit Parallel Form

• Recovers 125 Mhz Clock from Incoming Serial NRZI or MLT3 Data Stream

• Generates 25 Mhz Receive Clock

• Small Number of Passive External Components Required

• Selectable Low Power Mode

• Loop Back Capability

• Single +5V Power Supply

• Utilizes 0.8uM BiCMOS Technology

• 10mM X 10mM, 64 Pin, TQFP Package

This document contains information on a product under development. Motorola reserves the right to change or

discontinue this product without notice.

4/95

REV 1.3

MC68835 반도체 회로 부품 판매점

Twisted Pair Interface

국내 전력반도체 판매점

일반적인 전자부품 판매점

관련 데이터시트