VSC7177XYI

Specialized Overview

The VSC7177XYI is a Serial ATA and Serial Attached SCSI multiplier/buffer implementing a 2:1 port selector function for 1.5 Gbps and 3.0 Gbps links. It enables dual hosts to access single-port disk drives in high availability storage subsystems. The device supports sideband and protocol-based port selection, compliant with Serial ATA II Port Selector specification 1.0. It features programmable receiver sensitivity, high output swings with pre-emphasis, and transparent OOB signal transfer. Power dissipation ranges from 0.6 W to 0.8 W depending on the operating mode.

Specialized Feature Summary

• Implements 2:1 port selection for Serial ATA and Serial Attached SCSI links
• Supports sideband and protocol-based port selection modes
• Provides high output swing mode with programmable pre-emphasis
• Transparently transfers out-of-band signals between ports

Specialized Applications

• Active-passive redundant failover systems
• Dual-port Serial ATA and Serial Attached SCSI disk arrays (JBODs)
• RAID subsystems
• Disk-based backup systems

Specialized Procurement Notes

Verify component authenticity through authorized distributors or manufacturer channels. Confirm package integrity and pin alignment prior to installation. Ensure compatibility with existing system power supplies and control logic levels. Review datasheet specifications for absolute maximum ratings to prevent operational damage during deployment.

Specialized Selection Notes

Select this component for applications requiring redundant host access to single-port storage devices. Evaluate interface requirements against Serial ATA and SAS standards. Consider power consumption profiles and thermal management needs based on selected operating modes. Verify that external control signals align with sideband or protocol-based configuration options.

Specialized Part Context

The VSC7177 serves as an enhanced upgrade to legacy VSC7173 and VSC7175 devices. It maintains similar packaging but introduces improved connectivity and signal pre-emphasis capabilities. The XYI suffix indicates a lead-free variant of the standard VSC7177 component within the Maxim Integrated product line.

Specialized Replacement Considerations

Direct replacements include the VSC7173 and VSC7175. Note that pin configurations differ, particularly regarding PORTSEL1 and MODE1 settings for level-sensitive sideband mode. Verify circuit modifications are necessary when migrating from older variants to ensure proper functionality.