VSC7398XYU

Overview

The VSC7398XYU is an integrated Gigabit Ethernet switch featuring eight tri-speed copper transceivers compliant with IEEE 802.3ab. It supports nonblocking wire-speed performance and includes a 176-kilobyte on-chip frame buffer. The device integrates an on-chip 8051 CPU (V-Core) for SNMP and Web-based management, alongside support for off-chip CPUs. Electrical specifications include a 1.2 V core power supply and a 3.3 V interface power supply, utilizing a 25 MHz LVTTL reference clock.

Feature Summary

• Integrates eight tri-speed copper transceivers with multiplexed RGMII/GMII capability
• Includes an on-chip 8051 CPU supporting SNMP and Web-based management protocols
• Provides 176 kilobytes of on-chip frame buffer to eliminate external memory requirements
• Supports advanced QoS features including DSCP remarking for IPv4 and IPv6 frames

Applications

• 8-port unmanaged Gigabit Ethernet SMB/SOHO switches
• 8-port Web-managed Gigabit Ethernet SMB/SOHO switches
• LAN edge products requiring standard priority generation for core networks

Procurement Notes

Verify the component status as discontinued or limited supply through official Microchip Technology channels. Confirm that the ordering suffix XYU corresponds to the specific package and temperature range required for the design. Ensure compliance with RoHS directives by checking the latest product brief documentation before finalizing procurement plans.

Selection Notes

Select this component when designing compact network solutions requiring integrated PHYs to reduce system cost and PCB complexity. The internal V-Core CPU allows for flexible deployment in both managed and unmanaged configurations. Consider the low power dissipation characteristics for applications necessitating fanless operation and reduced thermal output.

Part Context

The VSC7398 belongs to the SparX-G8e family within the broader Vitesse Semiconductor switch portfolio. This family emphasizes high integration and software compatibility across different port counts. The VSC7398 specifically targets small-to-medium business environments by combining switching logic with physical layer transceivers in a single chip architecture.

Replacement Considerations

Consult official Microchip Technology documentation for confirmed substitute part numbers. Verify functional equivalence regarding pinout, voltage levels, and management interfaces before considering alternative components.