VSC8491YJU-13

Overview

The VSC8491YJU-13 is a dual-channel 10 GbE SerDes PHY manufactured by Microchip Technology, designed for WAN, LAN, and backplane applications. It supports RXAUI/XAUI to SFP+ and KR interfaces with data rates up to 10.3 Gbps for LAN and 9.95 Gbps for WAN, alongside 1.25 Gbps Ethernet capability. The device integrates VeriTime technology for IEEE 1588v2 precision timing within 4 ns accuracy and includes hardware-based MACsec (IEEE 802.1AE) supporting 128/256-bit encryption. Power consumption is typically 1.15 W per bidirectional channel, operating from 1.2 V and 1.0 V core supplies with a 2.5 V TTL supply.

Feature Summary

• Integrates VeriTime technology for high-precision IEEE 1588v2 timing implementation without loss of precision when combined with the MACsec engine.
• Provides hardware-based MACsec support compliant with IEEE 802.1AE specifications for secure data traversing Ethernet LANs.
• Supports adaptive equalization receivers and programmable multitap transmitter pre-emphasis to compensate for optical impairments and PCB degradations.
• Includes comprehensive BIST functionality with line and client loopbacks, pattern generation, and error detection capabilities.

Applications

• Multiple-port RXAUI/XAUI to SFI/SFP+ line cards or NICs
• Carrier Ethernet networks requiring IEEE 1588v2 timing
• Secure data center-to-data center interconnects
• 10GBASE-KR compliant backplane transceivers

Procurement Notes

Verify component authenticity through authorized Microchip distributors or official channels. Confirm RoHS compliance status via current datasheets as manufacturing processes may evolve. Check for Product Change Notifications (PCN) regarding package or material updates. Ensure EOL status is reviewed if long-term availability is required for production planning.

Selection Notes

Select this component for designs requiring integrated precision timing and security in 10GbE architectures. Verify interface compatibility with host systems supporting RXAUI/XAUI or SFP+ modules. Evaluate power budget constraints against the typical 1.15 W per channel consumption. Consider lane ordering and failover switching features for system redundancy requirements.

Part Context

This part belongs to the VSC849x series of 10G/1G SerDes PHYs from Microsemi/Microchip. Related products include the VSC8487-15, VSC8488-15, VSC8489, and VSC8490. These devices share similar architectural goals but vary in channel count and specific feature sets like FEC or MACsec integration.

Replacement Considerations

Potential substitutes within the same family include VSC8487-15, VSC8488-15, VSC8489, and VSC8490. Verify pinout and register compatibility before substitution. Cross-reference specific feature requirements such as MACsec support or timing accuracy across these related models.