VSC7173XYI

VSC7173XYI Datasheet

VSC7173 Data Sheet

Part	Datasheet
VSC7173XYI	VSC7173XYI (pdf)

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VSC7173 Data Sheet Enhanced 2:1 Port Selector and 1:2 Port Multiplier for Serial ATA and Serial Attached SCSI ● 2:1 port selector and 1:2 port multiplier for both Serial ATA SATA and Serial Attached SCSI SAS links ● Serial ATA compliant at Gbps capable ● Passes Serial ATA patterns transparently ● Programmable receiver sensitivity ● High output swing mode with pre-emphasis ● Compatible with VSC7175 and VSC7177 designs ● W power dissipation ● V power supply ● 32-pin, 7 mm x 7 mm QFP-N package ● Active-passive redundant failover systems ● Dual-port Serial ATA and Serial Attached SCSI disk arrays JBODs ● NAS servers ● RAID subsystems ● Disk-based backup systems ● Serial ATA and Serial Attached SCSI routing applications ● Buffers for externally connected links ● Serial ATA port replicators ● Serial ATA Host Bus Adapters selecting between internal and external connectors To order the VSC7173 device, see “Ordering Information,” page The VSC7173 is a Serial ATA and Serial Attached SCSI multiplier and buffer that implements a 2:1 port selector function for Gbps and Gbps links. This function is used when dual hosts, such as I/O controllers, must access single-port disk drives in high availability storage subsystems where redundancy and load sharing are important. The outputs from the I/O controllers are muxed to a Serial ATA or Serial Attached SCSI drive. The output from the Serial ATA drive is buffered and replicated to the I/O controllers. When switching from one I/O controller to the other, a Serial ATA link must be re-initialized with out-of-band OOB signals, which are transferred through the VSC7173 transparently. The VSC7173 provides high output swings with pre-emphasis, and programmable receiver sensitivity that are needed to drive long backplanes and external cables. In addition to the above features, the VSC7173 also supports a 1:2 port multiplier mode where one host can connect two drives. Port connectivity for the device is configured by driving external I/O pins. See the block diagram on page Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at 1 of 17 VSC7173 Block Diagram Port 0 P0INP OOB P0INN OOBPORT0 P0OUTP P0OUTN Port 1 P1INP OOB P1INN P1OUTP P1OUTN P0SLTD 0 S1 MODE1 MODE0 OOBSEL [0:1] HIV [0:2] VSC7173 Data Sheet Port 2 P2OUTP P2OUTN P2INP P2INN 0 1S MODE1 Edge-Triggered Logic PORTSEL0 PORTSEL1 I/O Configuration 2 of 17 VSC7173 Data Sheet Application Examples The VSC7173 allows two Serial ATA hosts to access one Serial ATA drive. Figure 1 shows a common application where redundant I/O controllers in disk arrays have multiplexed access to single-port Serial ATA disk drives. I/O Controller A VSC7173 I/O Controller B Serial ATA Drive 1 of n Backplane "Tailgate" Board Figure Serial ATA Backplane Application Another application example Figure 2 is for simple port replication to enable an existing Serial ATA Host Bus Adapter HBA to connect to two ports. By using the VSC7173, a single channel from the HBA may be selectively connected to an internal connector or an external connector. The VSC7173 provides both the mulitplexing functionality and buffering to drive external connections. Serial ATA Host Bus Adaptor PCI Bus Port A Port B ORDERING INFORMATION The VSC7173 device is available in a lead Pb -free package. VSC7173XYI is 32-pin leadless quad flat pack QFP-N with an exposed pad. Lead Pb -free products from Maxim comply with the temperatures and profiles defined in the joint IPC and JEDEC standard IPC/JEDEC J-STD-020. For more information, see the IPC and JEDEC standard. Table VSC7173 Ordering Information Part Number VSC7173XYI Description Lead Pb -free 32-pin QFP-N, 7 mm x 7 mm x mm body Maxim Integrated Products 120 San Gabriel Drive Sunnyvale, CA 94086 United States 408-737-7600 Copyright 2004 to 2005 Maxim Integrated Products Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. Maxim retains the right to make changes to its products or specifications to improve performance, reliability or manufacturability. All information in this document, including descriptions of features, functions, performance, technical specifications and availability, is subject to change without notice at any time. While the information furnished herein is held to be accurate and reliable, no responsibility will be assumed by Maxim for its use. Furthermore, the information contained herein does not convey to the purchaser of microelectronic devices any license under the patent right of any manufacturer. Maxim products are not intended for use in life support products where failure of a Maxim product could reasonably be expected to result in death or personal injury. Anyone using a Maxim product in such an application without express written consent of an officer of Maxim does so at their own risk, and agrees to fully indemnify Maxim for any damages that may result from such use or sale. is a registered trademark of Maxim Integrated Products, Inc. All other products or service names used in this publication are for identification purposes only, and may be trademarks or registered trademarks of their respective companies. All other trademarks or registered trademarks mentioned herein are the property of their respective holders. 17 of 17

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VSC7173 Data Sheet

Enhanced 2:1 Port Selector and 1:2 Port Multiplier for Serial ATA and Serial Attached SCSI
● 2:1 port selector and 1:2 port multiplier for both Serial ATA SATA and Serial Attached SCSI SAS links
● Serial ATA compliant at Gbps capable
● Passes Serial ATA patterns transparently ● Programmable receiver sensitivity ● High output swing mode with pre-emphasis ● Compatible with VSC7175 and VSC7177 designs ● W power dissipation ● V power supply ● 32-pin, 7 mm x 7 mm QFP-N package
● Active-passive redundant failover systems ● Dual-port Serial ATA and Serial Attached SCSI
disk arrays JBODs ● NAS servers ● RAID subsystems ● Disk-based backup systems ● Serial ATA and Serial Attached SCSI routing
applications ● Buffers for externally connected links ● Serial ATA port replicators ● Serial ATA Host Bus Adapters selecting between
internal and external connectors
To order the VSC7173 device, see “Ordering Information,” page

The VSC7173 is a Serial ATA and Serial Attached SCSI multiplier and buffer that implements a 2:1 port selector function for Gbps and Gbps links. This function is used when dual hosts, such as I/O controllers, must access single-port disk drives in high availability storage subsystems where redundancy and load sharing are important. The outputs from the I/O controllers are muxed to a Serial ATA or Serial Attached SCSI drive. The output from the Serial ATA drive is buffered and replicated to the I/O controllers. When switching from one I/O controller to the other, a Serial ATA link must be re-initialized with out-of-band OOB signals, which are transferred through the VSC7173 transparently. The VSC7173 provides high output swings with pre-emphasis, and programmable receiver sensitivity that are needed to drive long backplanes and external cables.

In addition to the above features, the VSC7173 also supports a 1:2 port multiplier mode where one host can connect two drives.

Port connectivity for the device is configured by driving external I/O pins. See the block diagram on page

Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at
1 of 17

VSC7173 Block Diagram

Port 0

P0INP OOB

P0INN OOBPORT0

P0OUTP

P0OUTN

Port 1

P1INP OOB

P1INN

P1OUTP

P1OUTN

P0SLTD
0 S1 MODE1 MODE0

OOBSEL [0:1] HIV [0:2]

VSC7173 Data Sheet

Port 2

P2OUTP P2OUTN

P2INP

P2INN
0 1S MODE1

Edge-Triggered Logic

PORTSEL0 PORTSEL1

I/O Configuration
2 of 17

VSC7173 Data Sheet

Application Examples

The VSC7173 allows two Serial ATA hosts to access one Serial ATA drive. Figure 1 shows a common application where redundant I/O controllers in disk arrays have multiplexed access to single-port Serial ATA disk drives.

I/O Controller A

VSC7173

I/O Controller B

Serial ATA Drive 1 of n

Backplane
"Tailgate" Board

Figure Serial ATA Backplane Application

Another application example Figure 2 is for simple port replication to enable an existing Serial ATA Host Bus Adapter HBA to connect to two ports. By using the VSC7173, a single channel from the HBA may be selectively connected to an internal connector or an external connector. The VSC7173 provides both the mulitplexing functionality and buffering to drive external connections.

Serial ATA Host Bus Adaptor

PCI Bus

Port A Port B
ORDERING INFORMATION

The VSC7173 device is available in a lead Pb -free package. VSC7173XYI is 32-pin leadless quad flat pack QFP-N with an exposed pad.

Lead Pb -free products from Maxim comply with the temperatures and profiles defined in the joint IPC and JEDEC standard IPC/JEDEC J-STD-020. For more information, see the IPC and JEDEC standard.
Table VSC7173 Ordering Information

Part Number VSC7173XYI

Description Lead Pb -free 32-pin QFP-N, 7 mm x 7 mm x mm body

Maxim Integrated Products 120 San Gabriel Drive Sunnyvale, CA 94086 United States
408-737-7600

Copyright 2004 to 2005 Maxim Integrated Products

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. Maxim retains the right to make changes to its products or specifications to improve performance, reliability or manufacturability. All information in this document, including descriptions of features, functions, performance, technical specifications and availability, is subject to change without notice at any time. While the information furnished herein is held to be accurate and reliable, no responsibility will be assumed by Maxim for its use. Furthermore, the information contained herein does not convey to the purchaser of microelectronic devices any license under the patent right of any manufacturer.

Maxim products are not intended for use in life support products where failure of a Maxim product could reasonably be expected to result in death or personal injury. Anyone using a Maxim product in such an application without express written consent of an officer of Maxim does so at their own risk, and agrees to fully indemnify Maxim for any damages that may result from such use or sale.
is a registered trademark of Maxim Integrated Products, Inc.

All other products or service names used in this publication are for identification purposes only, and may be trademarks or registered trademarks of their respective companies. All other trademarks or registered trademarks mentioned herein are the property of their respective holders.
17 of 17

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Datasheet ID: VSC7173XYI 647498