The VSC7177 is a Serial ATA and Serial Attached SCSI multiplier/buffer that implements a 2:1 port selector function for 1.5Gbps and 3.0Gbps 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 multiplexed 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 VSC7177 transparently. The VSC7177 provides high output swings, preemphasis, and programmable receiver sensitivity that are needed to drive long backplanes and external cables.
Port connectivity for the device can be configured using driving external I/O pins or through protocol-based port. See the block diagram on page 2 of the full data sheet.
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Key Features
Applications/Uses
2:1 Port Selector for Both Serial ATA (SATA) and Serial Attached SCSI (SAS) Links
Serial ATA 1.0 Compliant at 1.5Gbps (3.0Gbps Capable)
Sideband Port Selection
Complies with Serial ATA II: Port Selector Specification 1.0, Including Failover Control
Passes Serial ATA Patterns Transparently
Programmable Receiver Sensitivity
High Output Swing Mode with Preemphasis
Compatible with Legacy Designs (VSC7173 and VSC7175); Provides Enhanced Connectivity and Signal Preemphasis
0.6W to 0.8W Power Dissipation (Depending on Operating Mode)
3.3V Power Supply
32-Pin, 7mm x 7mm QFP-N Package
Active-Passive Redundant Failover Systems
Buffers for Externally Connected Links
Disk-Based Backup Systems
Dual-Port Serial ATA and Serial Attached SCSI Disk Arrays (JBODs)
NAS Servers
RAID Subsystems
Serial ATA and Serial Attached SCSI Routing applications
Key Specifications: Serial ATA (SATA) Port Multipliers/Selectors
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
Devices:
1-3 of 3
VSC7177
Free Sample
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Status
Recommended Replacement
Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
Temp
RoHS/Lead-Free? Materials Analysis
VSC7177XYI
Active
QFN;32 pin;50.4 mm²
Outline Drawing: 21-0092 (PDF)
Land Pattern: 90-0220 (PDF)
Use pkgcode/variation: G3277+2*
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