Texas Instruments HPL-D SLLU064A User Manual

4x4 Crosspoint Switch EVM

User's G uide

User's Guide

January 2004 HPL-D

SLLU064A

IMPORTANT NOTICE

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Applications

EVM IMPORTANT NOTICE

Texas Instruments (TI) provides the enclosed product(s) under the following conditions:

This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR
EVALUATION PURPOSES ONLY and is not considered by TI to be fit for commercial use. As such, the
goods being provided may not be complete in terms of required design–, marketing–, and/or manufacturing–
related protective considerations, including product safety measures typically found in the end product
incorporating the goods. As a prototype, this product does not fall within the scope of the European Union
directive on electromagnetic compatibility and therefore may not meet the technical requirements of the
directive.

Should this evaluation kit not meet the specifications indicated in the EVM User’s Guide, the kit may be
returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE
EXCLUSIVE WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES,
EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR
FITNESS FOR ANY PARTICULAR PURPOSE.

The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user
indemnifies TI from all claims arising from the handling or use of the goods. Please be aware that the
products received may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). Due to the open
construction of the product, it is the user’s responsibility to take any and all appropriate precautions with
regard to electrostatic discharge.

EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE
LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
DAMAGES.

TI currently deals with a variety of customers for products, and therefore our arrangement with the user is
not exclusive.

TI assumes no liability for applications assistance, customer product design, software performance,
or infringement of patents or services described herein.

Please read the EVM User’s Guide and, specifically, the EVM Warnings and Restrictions notice in the EVM
User’s Guide prior to handling the product. This notice contains important safety information about
temperatures and voltages. For further safety concerns, please contact the TI application engineer.

Persons handling the product must have electronics training and observe good laboratory practice standards.

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Mailing Address:

Texas Instruments
Post Office Box 655303
Dallas, Texas 75265

Copyright  2003 - 2004, Texas Instruments Incorporated

www.ti.com

3

EVM WARNINGS AND RESTRICTIONS

It is important to operate this EVM within the input voltage range of -0.7 V to 4 V and the output voltage range
of -0.5 V to 4 V.

Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the
EVM. If there are questions concerning the input range, please contact a TI field representative prior to
connecting the input power.

Applying loads outside of the specified output range may result in unintended operation and/or possible
permanent damage to the EVM. Please consult the EVM User’s Guide prior to connecting any load to the
EVM output. If there is uncertainty as to the load specification, please contact a TI field representative.

During normal operation, some circuit components may have case temperatures greater than 60°C. The
EVM is designed to operate properly with certain components above 60°C as long as the input and output
ranges are maintained. These components include but are not limited to linear regulators, switching
transistors, pass transistors, and current sense resistors. These types of devices can be identified using the
EVM schematic located in the EVM User’s Guide. When placing measurement probes near these devices
during operation, please be aware that these devices may be very warm to the touch.

Mailing Address:

Texas Instruments
Post Office Box 655303
Dallas, Texas 75265

Copyright  2003 - 2004, Texas Instruments Incorporated

About This Manual

This evaluation module (EVM) user’s guide describes the hardware, theory
of operation, and use
performance and functionality of either the SN65LVDS125A or
SN65LVDS250 4x4 crosspoint switches.

How to Use This Manual

Read This First

of

the EVM for evaluating the high-speed

Preface

Chapter 1 provides an overview of the functional configurations and signal
paths. Typical hardware setup and results are discussed in Chapter 2.
Chapter 3 provides schematics, the board layout, the board layers,
fabrication notes, and bill of materials

Related Documentation from Texas Instruments

SN65LVDS125A, 4x4 1.5 Gbps LVDS Crosspoint Switch Data Sheet
(SLLS595).

SN65LVDS250, 4x4 2.5 Gbps LVDS Crosspoint Switch Data Sheet
(SLLS594).

If You Need Assistance

www.ti.com

E-mail technical support http://www-

k.ext.ti.com/sc/technical_support/email_tech_support.asp

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Japan 0120-81-0036

iii

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FCC Warning

This equipment is intended for use in a laboratory test environment only. It
generates, uses, and can radiate radio frequency energy and has not been
tested for compliance with the limits of computing devices pursuant to
subpart J of part 15 of FCC rules, which are designed to provide
reasonable protection against radio frequency interference. Operation of
this equipment in other environments may cause interference with radio
communications, in which case the user at his expense will be required to
take whatever measures may be required to correct this interference.

If your book does not discuss a product that creates radio frequency
interference, delete this section from your preface. If your book does
discuss a product that creates radio frequency interference, you must
include this warning as it appears above.

iv

Contents

Read This First ................................................................................................................iii

About This Manual..................................................................................................... iii

How to Use This Manual ........................................................................................... iii

Related Documentation from Texas Instruments ....................................................... iii

If You Need Assistance ............................................................................................. iii

FCC Warning............................................................................................................. iv

Contents ...........................................................................................................................v

Figures.............................................................................................................................. v

Tables .............................................................................................................................. vi

1 Overview ....................................................................................................................1-1

1.1 Sample Functional Configurations ...................................................................1-2

1.2 Signal Paths ....................................................................................................1-4

2 Setup and Required Equipment ...............................................................................2-1

2.1 Applying an Input.............................................................................................2-1

2.2 Observing an Output........................................................................................2-4

2.3 Typical Test Results ........................................................................................2-4

3 EVM Construction.....................................................................................................3-1

3.1 Schematic........................................................................................................3-2

3.2 Board Layout Patterns.....................................................................................3-3

3.3 PCB Fabrication Requirements and Stack Up .................................................3-8

3.4 Bill of Materials ................................................................................................3-9

Figures

Figure 1-1. Sample Functional Configurations of the 4x4 Crosspoint Switch..........1-2

Figure 1-2. 4x4 Crosspoint Switch EVM ......................................................................1-3

Figure 1-3. 4x4 Crosspoint Switch Signal Paths .........................................................1-4

Figure 2-1. EVM Power Connections for Either SN65LVDS125A or SN65LVDS250

Evaluation..............................................................................................................2-2

Figure 2-2. Termination for Interfacing LVDS, CML, or LVPECL Drivers ..................2-3

Figure 2-3. Typical Test Results...................................................................................2-5

Figure 3-1. 4x4 Crosspoint Switch EVM Schematic....................................................3-2

Figure 3-2. 4x4 Crosspoint Switch EVM Board Layout...............................................3-3

Figure 3-3. Layer 1–Signal Plane .................................................................................3-4

Figure 3-4. GND Plane...................................................................................................3-5

Figure 3-5. Layer 3–Vcc ................................................................................................3-5

v

Tables

Figure 3-6. Layer 4–Vcc01 Plane..................................................................................3-6

Figure 3-7. Layer 5–GND Plane ....................................................................................3-6

Figure 3-8. Layer 6–GND/Signal Plane.........................................................................3-7

Tables

Table 2-1 Crosspoint Function Table...........................................................................2-3

Table 3-2. Bill of Materials for the SN65LVDS125A / SN65LVDS250..........................3-9

vi

Chapter 1

1 Overview

This chapter provides a high-level description of the 4x4 crosspoint switch
EVM mounted with either a SN65LVDS125A, 4x4 1.5-Gbps or a
SN65LVDS250, 4x4 2.5-Gbps crosspoint switch.

Topic Page

1.1 Sample Functional Configurations 1-2

1.2 Signal Paths 1-4

1-1