Microchip Technology VSC8552XKS-02

Overview

VSC8552XKS-02 from Microsemi (now Microchip) is a dual-port 10/100/1000BASE-T physical layer transceiver (PHY) supporting Synchronous Ethernet, QSGMII/SGMII/RGMII MAC interfaces, and IEEE 802.3af PoE. It delivers full-duplex gigabit operation over Cat5 UTP, features ActiPHY power management, and enables carrier-grade timing in metro Ethernet edge devices.

For engineers reviewing the VSC8552XKS-02 datasheet, VSC8552XKS-02 pinout, VSC8552XKS-02 application, or VSC8552XKS-02 equivalent, key selection criteria include Synchronous Ethernet compliance, dual-port RGMII/SGMII flexibility, integrated VeriPHY cable diagnostics, and support for ring resiliency protocols in telecom access equipment.

Technical Context

The VSC8552XKS-02 implements two independent 1000BASE-T PHYs with full IEEE 802.3ab compliance, each supporting autonegotiation, parallel detection, and automatic MDI/MDIX. Its SerDes media interface supports 1000BASE-X, 100BASE-FX, and protocol conversion modes including QSGMII-to-SGMII.

It integrates a synchronous Ethernet clock recovery architecture with recovered clock outputs (REFCLK1/REFCLK2), IEEE 1588-capable timing control, and hardware-accelerated ring resiliency per ITU-T G.8032. The device operates with a single 25 MHz reference clock and supports differential or single-ended input.

Key Specifications

Pinout & Package

The VSC8552XKS-02 is housed in a 256-pin 17 mm × 17 mm × 1.4 mm LFBGA package with 0.8 mm pitch and exposed thermal pad. Pin assignment follows Microsemi's standard QSGMII/RGMII SerDes layout optimized for signal integrity and EMI suppression.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-port Gigabit Ethernet PHY applications.

Compared with the VSC8552XKS-02, the 88E1512 offers lower gate count but lacks hardware SynchE and ring resiliency, while the LAN8814 provides superior PTP accuracy at the cost of dual-port integration and SynchE compliance - making the VSC8552XKS-02 optimal for carrier-class metro edge nodes requiring all three capabilities in one package.

Availability

VSC8552XKS-02 is available at Aetrix Electronics and suitable for mobile backhaul aggregation, industrial Ethernet switching, and carrier Ethernet access nodes requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for VSC8552XKS-02 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microsemi, now part of Microchip Technology, specializes in high-reliability semiconductor solutions for aerospace, defense, communications, and industrial markets - with deep expertise in timing, networking, and radiation-hardened ICs.

The VSC8552XKS-02 belongs to Microsemi's Carrier Ethernet PHY product line, engineered specifically for metro edge and access infrastructure demanding Synchronous Ethernet, hardware ring protection, and robust cable diagnostics in harsh environments.

FAQ

What is the primary function of the VSC8552XKS-02 in a network system?

The VSC8552XKS-02 serves as a dual-port 10/100/1000BASE-T physical layer transceiver that bridges MAC-layer interfaces (RGMII/SGMII/QSGMII) to copper or fiber media. It enables full-duplex gigabit Ethernet connectivity while providing Synchronous Ethernet timing recovery, ring resiliency, and IEEE 802.3af PoE support - making it ideal for carrier-grade access equipment. The VSC8552XKS-02 integrates these functions without requiring external clock cleaners or retimers.

Does the VSC8552XKS-02 support Synchronous Ethernet, and what level of compliance does it meet?

Yes, the VSC8552XKS-02 fully complies with ITU-T G.8262 for Synchronous Ethernet, supporting EEC Option 1 and Option 2 clock recovery. It recovers and cleans phase-locked timing from incoming Ethernet streams and provides two configurable recovered clock outputs (REFCLK1/REFCLK2) with squelch control. This allows the VSC8552XKS-02 to serve as a timing source for adjacent FPGAs or packet processors in metro edge nodes.

How does VeriPHY cable diagnostics work in the VSC8552XKS-02, and what faults can it detect?

VeriPHY in the VSC8552XKS-02 uses time-domain reflectometry (TDR) principles to inject test pulses and analyze reflections on Cat5/6 UTP cables. It detects and locates opens, shorts, impedance mismatches, and split-pair wiring up to 150 meters. Results are accessible via MDIO registers and can trigger interrupts - enabling remote troubleshooting without physical inspection. This capability is built into the VSC8552XKS-02 and requires no external components.

Can the VSC8552XKS-02 operate with a single reference clock, and what are the supported input types?

Yes, the VSC8552XKS-02 operates with a single 25 MHz reference clock, accepting either differential (LVDS) via REFCLK_P/REFCLK_N pins or single-ended (CMOS) via REFCLK_SE. The clock input drives internal PLLs for all SerDes and PHY functions. Configuration is handled through strap pins or MDIO registers, and the VSC8552XKS-02 automatically adapts jitter filtering based on input type - ensuring robust timing under varying board layout conditions.

What power management features does the VSC8552XKS-02 offer, and how much power does it consume in low-power mode?

The VSC8552XKS-02 implements ActiPHY - a three-state power management system with Low Power State (<150 mW/port), Link Partner Wake-Up State, and Normal Operating State. In Low Power State, it maintains MDIO accessibility and link status while disabling SerDes and analog front-end circuitry. Power savings exceed 65% versus conventional PHYs. All states are controlled via MDIO registers, and the VSC8552XKS-02 supports wake-on-LAN and fast link re-establishment within microseconds.