Microchip Technology VSC8574XKS-04

Overview

VSC8574XKS-04 from Microsemi (now Microchip) is a quad-port 10/100/1000BASE-T Ethernet PHY IC with integrated IEEE 1588v2 timestamping engine, Synchronous Ethernet support, and QSGMII/SGMII MAC interface. It delivers sub-50 ns timestamp accuracy, supports one-step and two-step transparent/boundary clock modes, and operates across -40°C to +85°C industrial temperature range in a 256-pin TQFP package.

For engineers reviewing the VSC8574XKS-04 datasheet, VSC8574XKS-04 pinout, VSC8574XKS-04 application, or VSC8574XKS-04 equivalent, this device is selected for carrier-grade timing-critical Ethernet switches, IEEE 1588-aware industrial automation controllers, and Synchronous Ethernet-compliant metro access nodes requiring deterministic latency and precise PTP synchronization.

Technical Context

The VSC8574XKS-04 implements four independent 10/100/1000BASE-T PHYs sharing a unified IEEE 1588 timestamping subsystem with hardware-accelerated packet parsing, local time counter, and serial timestamp output interface. Its SerDes media interface supports 1000BASE-X, 100BASE-FX, and protocol conversion between QSGMII/SGMII and copper/fiber physical layers.

It integrates ActiPHY power management for dynamic link-state adaptation, Energy Efficient Ethernet (EEE) per IEEE 802.3az, and ring resiliency for rapid fault recovery in metro Ethernet topologies. Reference clock inputs support both single-ended and differential 25 MHz/125 MHz configurations, with dedicated 1588 reference clock input for high-stability timing.

Key Specifications

Pinout & Package

Package: 256-pin Thin Quad Flat Package (TQFP), 24 mm × 24 mm body, 0.4 mm lead pitch, exposed thermal pad (EPAD) on underside for enhanced thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Ethernet PHY applications.

Compared with VSC8574XKS-04, the Marvell 88E1512 shifts 1588 processing burden to the host, increasing software latency and jitter, while the Intel I210-IT lacks multi-port integration and telecom-grade timing features-making VSC8574XKS-04 uniquely suited for carrier Ethernet and precision timing infrastructure.

Availability

VSC8574XKS-04 is available at Aetrix Electronics and suitable for mobile fronthaul gateways, industrial precision timing nodes, and carrier Ethernet access switches requiring stable component supply across extended product lifecycles.

Supply support for VSC8574XKS-04 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 Inc., specializes in high-reliability semiconductor solutions for aerospace, defense, communications, and industrial markets-with emphasis on timing, security, and power integrity.

The VSC8574XKS-04 belongs to Microsemi's Carrier Ethernet PHY product line, engineered specifically for telecom infrastructure demanding IEEE 1588v2 precision, Synchronous Ethernet compliance, and robust Layer 1 resilience in harsh environments.

FAQ

What is the primary function of the VSC8574XKS-04 in a network system?

The VSC8574XKS-04 serves as a quad-port 10/100/1000BASE-T Ethernet PHY with integrated IEEE 1588v2 timestamping and Synchronous Ethernet capabilities. It operates as a boundary or transparent clock in PTP networks, recovers and distributes precise timing across four copper links, and enables deterministic packet forwarding in carrier-grade switches and industrial controllers. Its design centers on timing-critical infrastructure where sub-100 ns accuracy and G.8262 compliance are mandatory.

Does the VSC8574XKS-04 support both QSGMII and SGMII MAC interfaces?

Yes, the VSC8574XKS-04 supports both QSGMII and SGMII MAC interfaces through configurable SerDes settings. QSGMII allows all four PHYs to connect to a single MAC using a 4-lane 100 MHz interface, reducing PCB complexity versus discrete RGMII connections. SGMII mode enables individual 1.25 Gbps links per port for flexible switch fabric topologies. Configuration is performed via MDIO registers during initialization.

How does the VSC8574XKS-04 achieve IEEE 1588 timestamp accuracy below 50 ns?

The VSC8574XKS-04 achieves ±42 ns typical timestamp accuracy through dedicated hardware blocks: a low-jitter local time counter synchronized to the 1588_REFCLK_IN input, packet parser that identifies PTP event messages at the PHY layer, and timestamp FIFO with deterministic latency. Hardware timestamp insertion occurs before MAC-layer processing, eliminating software-induced jitter. The device also supports one-step PTP to reduce packet modification overhead.

Is the VSC8574XKS-04 qualified for industrial temperature operation?

Yes, the VSC8574XKS-04 is fully specified and tested for operation across -40°C to +85°C ambient temperature. This qualification covers all electrical parameters-including 1588 timestamp accuracy, SyncE holdover stability, and 1000BASE-T link integrity-making it suitable for deployment in uncontrolled industrial cabinets, outdoor telecom enclosures, and rail-side networking equipment without active cooling.

What power management features does the VSC8574XKS-04 include?

The VSC8574XKS-04 implements ActiPHY power management with three defined states: Low Power (deep sleep with minimal current draw), Link Partner Wake-Up (fast link re-establishment within 100 μs), and Normal Operating State. It also supports IEEE 802.3az Energy Efficient Ethernet (EEE), dynamically disabling PHY circuitry during idle periods. These features collectively reduce average power consumption by over 60% compared to legacy PHYs under real-world traffic loads.