EGLXT915QC.B3 datasheet, PDF - EEWORLD Datasheet

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EGLXT915QC.B3: DescriptionNetwork Interface, CMOS, PQFP64; CategoryWireless rf/communication Telecom circuit; File Size463KB，30 Pages; ManufacturerInphi Corporation; Environmental Compliance

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EGLXT915QC.B3 Overview

Network Interface, CMOS, PQFP64

EGLXT915QC.B3 Parametric

Parameter Name	Attribute value
Is it Rohs certified?	conform to
package instruction	QFP, QFP64,.66SQ,32
Reach Compliance Code	compliant
JESD-30 code	S-PQFP-G64
Number of terminals	64
Maximum operating temperature	70 °C
Minimum operating temperature
Package body material	PLASTIC/EPOXY
encapsulated code	QFP
Encapsulate equivalent code	QFP64,.66SQ,32
Package shape	SQUARE
Package form	FLATPACK
power supply	5 V
Certification status	Not Qualified
Maximum slew rate	180 mA
Nominal supply voltage	5 V
surface mount	YES
technology	CMOS
Temperature level	COMMERCIAL
Terminal form	GULL WING
Terminal pitch	0.8 mm
Terminal location	QUAD
Base Number Matches	1

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LXT915

Simple Quad Ethernet Repeater

Datasheet

The LXT915 is an integrated multi-port repeater designed for mixed-media networks. It

provides all the active circuitry required for the repeater function in a single CMOS device. It

includes one Attachment Unit Interface (AUI) port and four 10BASE-T transceivers. The AUI

port allows connection of an external transceiver (10BASE-2, 10BASE-5, 10BASE-T or

FOIRL) or a drop cable. The 10BASE-T transceivers are entirely self-contained with internal

filters that simplify the design work required for FCC-compliant EMI performance.

An Inter-Repeater Backplane (IRB) interface allows 128 or more 10BASE-T ports to be

cascaded, creating a large single-segment multi-port repeater.

The LXT915 requires only a single 5-volt power supply due to its advanced CMOS fabrication

process.

Applications

Remote or Stand-alone Unmanaged Hubs

Stackable Unmanaged Hubs

Product Features

Four integrated 10BASE-T transceivers

and one AUI transceiver on a single chip

Six integrated LED drivers with four

unique operational modes

On-chip transmit and receive filtering

Automatic polarity detection and correction

Synchronous or asynchronous Inter-

Repeater Backplane supports “hot

swapping”

Inter-repeater backplane allows cascaded

repeaters, linking 128 or more 10BASE-T

ports

Packaged in 64-pin PQFP

As of January 15, 2001, this document replaces the Level One document

LXT915 — Simple Quad Ethernet Repeater.

Order Number:

249343-002

February 2001

Simple Quad Ethernet Repeater — LXT915

Contents

1.0

2.0

LXT915 Pin Assignments and Signal Descriptions

...................................................... 8

LXT915 Functional Description.....................................................................................12

2.1

2.2

Introduction..........................................................................................................12

External Interfaces ..............................................................................................12

2.2.1 10BASE-T Ports .....................................................................................12

2.2.2 AUI Port..................................................................................................12

2.2.3 Inter-Repeater Backplane ......................................................................12

2.2.3.1 Synchronous IRB Operation......................................................13

2.2.3.2 Asynchronous IRB Operation ....................................................13

Internal Repeater Circuitry ..................................................................................13

Initialization..........................................................................................................14

10BASE-T Port Operation ...................................................................................16

2.5.1 10BASE-T Reception .............................................................................16

2.5.2 Polarity Detection and Correction...........................................................16

2.5.3 10BASE-T Link Integrity Testing ............................................................16

2.5.4 10BASE-T Transmission ........................................................................16

AUI Port Operation ..............................................................................................17

2.6.1 AUI Reception ........................................................................................17

2.6.2 AUI Transmission ...................................................................................17

Collision Handling................................................................................................17

LED Display.........................................................................................................17

2.8.1 LED Mode 0 (Default).............................................................................17

2.8.2 LED Mode 1 ...........................................................................................18

2.8.3 LED Mode 2 ...........................................................................................18

2.8.4 LED Mode 3 ...........................................................................................18

Layout Requirements ..........................................................................................21

3.1.1 The Twisted Pair Interface .....................................................................21

3.1.2 The RBIAS Pin .......................................................................................21

Unmanaged Hub Application...............................................................................21

Magnetics Requirements.....................................................................................25

3.3.1 The Twisted Pair Interface .....................................................................25

3.3.2 Component Selection .............................................................................25

2.3

2.4

2.5

2.6

2.7

2.8

3.0

LXT915 Application Information

...................................................................................21

3.1

3.2

3.3

4.0

5.0

LXT915 Test Specifications...........................................................................................26

LXT915 Mechanical Specifications...............................................................................30

Datasheet

LXT915 — Simple Quad Ethernet Repeater

Figures

LXT915 Block Diagram ......................................................................................... 7

LXT915 Pin Assignments...................................................................................... 8

Global State Machine.......................................................................................... 14

Partitioning State Diagram .................................................................................. 15

Integrated LED Driver Indications ....................................................................... 20

LXT915 8-Port Unmanaged Hub Application, LED Mode 1 Selected (1 of 2)..... 23

LXT915 8-Port Unmanaged Hub Application LED Mode 1 Selected (2 of 2)...... 24

Inter-Repeater Bus Timing .................................................................................. 29

LXT915 Package Specifications ......................................................................... 30

Tables

Twisted-Pair Port Signal Descriptions ................................................................... 9

AUI Port Signal Descriptions................................................................................. 9

Control, Status and Miscellaneous Signal Descriptions........................................ 9

Inter-Repeater Backplane Signal Descriptions ................................................... 10

LXT915 Power Supply Signal Descriptions......................................................... 11

LED Mode Selection ........................................................................................... 18

Mode 0 LED Truth Table (Default) ...................................................................... 18

Mode 1 LED Truth Table..................................................................................... 18

Mode 2 LED Truth Table..................................................................................... 19

Mode 3 LED Truth Table..................................................................................... 19

Manufacturers Magnetics List ............................................................................ 25

Absolute Maximum Ratings ................................................................................ 26

Recommended Operating Conditions ................................................................. 26

I/O Electrical Characteristics1 ............................................................................. 26

AUI Electrical Characteristics.............................................................................. 27

TP Electrical Characteristics ............................................................................... 27

IRB Electrical Characteristics.............................................................................. 27

Switching Characteristics .................................................................................... 28

Inter-Repeater Bus Timing .................................................................................. 29

Datasheet

EGLXT915QC.B3 Related Products

	EGLXT915QC.B3	SLXT915QC.B3
Description	Network Interface, CMOS, PQFP64	Network Interface, CMOS, PQFP64,
Is it Rohs certified?	conform to	incompatible
package instruction	QFP, QFP64,.66SQ,32	QFP, QFP64,.66SQ,32
Reach Compliance Code	compliant	compliant
JESD-30 code	S-PQFP-G64	S-PQFP-G64
Number of terminals	64	64
Maximum operating temperature	70 °C	70 °C
Package body material	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	QFP	QFP
Encapsulate equivalent code	QFP64,.66SQ,32	QFP64,.66SQ,32
Package shape	SQUARE	SQUARE
Package form	FLATPACK	FLATPACK
power supply	5 V	5 V
Certification status	Not Qualified	Not Qualified
Maximum slew rate	180 mA	180 mA
Nominal supply voltage	5 V	5 V
surface mount	YES	YES
technology	CMOS	CMOS
Temperature level	COMMERCIAL	COMMERCIAL
Terminal form	GULL WING	GULL WING
Terminal pitch	0.8 mm	0.8 mm
Terminal location	QUAD	QUAD

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