6.25 Gbps, 4 4, Digital Crosspoint Switch with EQ AD8156 FEATURES FUNCTIONAL BLOCK DIAGRAM 4 4, fully differential, nonblocking array AD8156 INPUT INPUT OUTPUT Configurable for dual 2 2 operation RECEIVERS EQUALIZATION DRIVERS DC to 6.25 Gbps per channel, NRZ data rate IN0P/N OUT0P/N EQ Programmable input equalization compensates for over 40 IN1P/N EQ OUT1P/N of FR-4 at 6.25 Gbps 4 4 SWITCH Multicast and broadcast modes of operation IN2P/N OUT2P/N EQ Programmable output swing 100 mV p-p to 1.6 V p-p differential IN3P/N EQ OUT3P/N Power supply: 3.3 V (10%) Low power CS No EQ: 400 mW typical RST Maximum EQ: 700 mW typical UPD CONTROL WE LOGIC Inputs: ac-coupled or dc-coupled RE MODE Wide set of dc-coupled input standards 4 D 3:0 4 A 3:0 3.3 V/2.5 V/1.8 V CML or 3.3 V LVPECL Control: LVTTL- or LVCMOS-compatible Figure 1. Low additive jitter: 25 ps p-p typical Low random jitter: 0.8 ps rms Integrated 50 termination impedance at inputs/outputs Individual output disable for power savings 49-ball, 8 mm 8 mm BGA, 1 mm pitch APPLICATIONS Backplane equalization SONET/SDH Gigabit Ethernet XAUI Fibre Channel GENERAL DESCRIPTION The AD8156, a member of the Xstream line of products, is a The AD8156 high speed inputs are compatible with both ac- high speed, fully differential, digital crosspoint switch. The part coupled and dc-coupled 3.3 V, 2.5 V, or 1.8 V CML, as well as can function as a 4 4 crosspoint switch with double-latched 3.3 V LVPECL data levels. The control interface is LVTTL- and memory, allowing simultaneous updates, or as a dual 2 2 with LVCMOS-compatible at 3.3 V. All input and output termination direct output control. The AD8156 has low power dissipation, resistors are integrated for ease of layout and to minimize typically 700 mW on 3.3 V with all outputs and input equalizers impedance mismatch. Input equalization and unused outputs active. It operates at any data rate from dc to 6.25 Gbps per port. can be individually disabled to minimize power dissipation. Each input channel on the AD8156 has a programmable input The AD8156 is packaged in a 49-ball, 8 mm 8 mm, BGA equalizer to compensate for signal loss over a backplane. package with a 1 mm ball pitch. It operates over the industrial temperature range of 40C to 85C. Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 2007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 06305-001AD8156 TABLE OF CONTENTS Features .............................................................................................. 1 Theory of Operation ...................................................................... 13 Applications....................................................................................... 1 4 4 Mode................................................................................... 13 Functional Block Diagram .............................................................. 1 Dual 2 2 Mode......................................................................... 13 General Description ......................................................................... 1 Input Equalization...................................................................... 14 Revision History ............................................................................... 2 Control Interface Description....................................................... 15 Specifications..................................................................................... 3 Control Pins ................................................................................ 15 Electrical Specifications............................................................... 3 Address Pins, A 3:0 Inputs ...................................................... 16 Timing Specifications .................................................................. 4 Data Pins, D 3:0 Inputs/Outputs............................................ 16 Timing Diagrams.............................................................................. 5 Control Interface Levels ............................................................ 16 Absolute Maximum Ratings............................................................ 7 Programming Examples ................................................................ 17 Thermal Resistance ...................................................................... 7 Dual 2 2 Mode (MODE Pin = 1) Programming Examples............................................................ 17 ESD Caution.................................................................................. 7 4 4 Mode (MODE Pin = 0) Programming Examples ........ 17 Pin Configurations and Function Descriptions ........................... 8 Outline Dimensions ....................................................................... 19 Typical Performance Characteristics ............................................. 9 Ordering Guide .......................................................................... 19 Test Circuit ...................................................................................... 12 REVISION HISTORY 5/07Revision 0: Initial Version Rev. 0 Page 2 of 20