VSC8256EV

Telecom Overview

The VSC8256 is a quad-channel, protocol-agnostic serial-to-serial repeater and retimer designed for board-level signal integrity applications. It supports 10GBASE-KR backplane interfaces with integrated hardware-based host-side auto-negotiation and training. The device operates at data rates of 10.3125 Gbps in LAN mode, 9.95328 Gbps in WAN mode, and 1.25 Gbps. It features cross-point switching for configurable line ordering and includes built-in self-test (BIST) functions. Power consumption is typically 950 mW per bidirectional channel, utilizing 1.2 V and 1.0 V core supplies alongside a 2.5 V TTL supply.

Telecom Feature Summary

• Integrates hardware-based host-side 10GBASE-KR auto-negotiation and training for simplified backplane connectivity.
• Provides flexible clocking options supporting LAN/WAN operation with a single 156.25 MHz reference clock and Synchronous Ethernet.
• Includes adaptive equalization receivers and programmable multi-tap transmitter pre-emphasis for signal conditioning.
• Offers comprehensive on-chip instrumentation including BIST, loopbacks, pattern generation, and error detection.

Telecom Applications

• Multi-port serial-to-serial signal conditioning
• 10GBASE-KR-compliant backplane transceivers
• Multi-port XFI/KR to SFI/SFP+ 10 GbE switch cards, router cards, and network adapters

Telecom Procurement Notes

Verify the specific package type and pinout configuration against the official datasheet before integration. Confirm that the design environment supports the required 1.2 V and 1.0 V core power supplies as well as the 2.5 V TTL interface. Ensure thermal management strategies account for the typical 950 mW power dissipation per bidirectional channel during operation.

Telecom Selection Notes

Select this component when protocol-agnostic retiming and 10GBASE-KR auto-negotiation are required in a compact form factor. It is suitable for designs needing low power consumption and flexible clocking for Synchronous Ethernet. Consider related products like the VSC8257 or VSC8258 if additional channel counts or different interface configurations are needed for the target application.

Telecom Part Context

The VSC8256 belongs to Microsemi's portfolio of Ethernet solutions, specifically targeting high-speed serial connectivity. It complements other devices such as the VSC8257, VSC8258, and various switch modules like the VSC7442 series. This family of components addresses the growing demand for efficient signal conditioning in enterprise storage and communications systems.

Telecom Replacement Considerations

Publicly confirmed substitute part numbers include VSC8257 and VSC8258. Verify compatibility regarding channel count and interface support before substitution.

Telecom FAQ

Does the VSC8256 support Synchronous Ethernet?

Yes, the device supports Synchronous Ethernet (SyncE) through its flexible clocking options, which enable Layer 1 support using a single 156.25 MHz reference clock rate.

What is the typical power consumption per channel?

The typical power consumption is 950 mW for each bidirectional channel.

Can the VSC8256 handle both LAN and WAN modes?

Yes, it supports 10.3125 Gbps LAN mode and 9.95328 Gbps WAN mode, along with 1.25 Gbps legacy KR repeater functionality.