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INTERCONNECT APPLICATION NOTE STRADA Whisper 4.5mm Connector Enhanced Backplane and Daughtercard Footprint Routing Guide Report # 32GC001 01/26/2015 Rev 3.0 STRADA Whisper Connector  Copyright 2015 TE Connectivity, Harrisburg, PA All Rights Reserved Circuits & Design Report #32GC001 Rev3 STRADA Whisper 4.5mm Connector Enhanced Backplane Footprint Routing Guide Table of Contents Item Page # I. INTRODUCTION..........................................................................................................2 II. CONNECTOR OVERVIEW: STRADA WHISPER .................................................2 A. Background ................................................................................................................2 1. Features ................................................................................................................3 2. Applications .........................................................................................................3 B. Typical Implementations ...........................................................................................3 1. Right-Angle Differential ......................................................................................3 III. CONNECTOR DEFINITION ......................................................................................4 A. BACKPLANE and DAUGHTERCARD FOOTPRINTS .........................................4 1. Drilled Hole Dimensions .....................................................................................5 2. Fabrication Technology .......................................................................................6 3. High Speed Via Design ........................................................................................10 IV. ROUTING ......................................................................................................................11 A. BACKPLANE and DAUGHTERCARD ROUTING................................................12 1. Routing Channels .................................................................................................12 2. 45-Degree Routing ...............................................................................................13 3. Escape Routing ....................................................................................................13 4. Layer Count Analysis ..........................................................................................15 5. Layer Specific Routing ........................................................................................16 V. GENERAL ......................................................................................................................18 A. Pinout Recommendation ............................................................................................18 B. Example Stackups and Material Characteristics ........................................................18 C. Recommended Routing Techniques ..........................................................................19 1. Right-angle Bends ................................................................................................19 VI. PART PLACEMENT ....................................................................................................19 VII. ADDITIONAL INFORMATION .................................................................................19 A. Gigabit Research and General Application Notes .....................................................19 B. Electrical Models .......................................................................................................19 C. Website ......................................................................................................................19 VIII. CONTACT INFORMATION .......................................................................................19 TE Connectivity Circuits & Design PAGE 1 01/26/2015 Circuits & Design Report #32GC001 Rev3 STRADA Whisper 4.5mm Connector Enhanced Backplane Footprint Routing Guide STRADA Whisper 4.5mm Connector Routing I. INTRODUCTION As engineers design systems that attempt to push serial speeds across backplane environments in the tens of gigabits per second range, the selection of the system’s electrical connector becomes more significant. Electrical, mechanical, and manufacturing aspects of the connector must be considered simultaneously. At the board level these aspects combine with common board design practices to influence the design of the connector-to-board interface and how the board itself will be routed. The manner in which the connector is designed into the system can significantly impact the system’s intended performance. TE has been actively researching these areas in an effort to help customers use the STRADA Whisper connector in multi-gigabit serial systems. The combination of interconnect research and intimate knowledge of the connector is presented to provide insight into the capability of a STRADA Whisper-based system design. Furthermore, this document provides specific design recommendations that will address layout, electrical performance, and manufacturability tradeoffs of the connector at the board level. II. CONNECTOR OVERVIEW: STRADA WHISPER A. BACKGROUND Figure 1: STRADA Whisper Connector TE Connectivity Circuits & Design PAGE 2 01/26/2015 Circuits & Design Report #32GC001 Rev3 STRADA Whisper 4.5mm Connector Enhanced Backplane Footprint Routing Guide The STRADA Whisper connector is the first of the next generation of high speed backplane interconnects offered by TE. A revolutionary performance upgrade is a result of the extremely low noise characteristics of the individually shielded pairs which provide improved signal integrity and EMI performance over competitive products. The in-row “horizontal” pair orientation enables the STRADA Whisper connector to have zero intra-pair skew. 1. FEATURES • 40 Gb/s performance • Individual shielded pairs facilitate excellent signal integrity and EMI performance • Connector noise