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Microchip Technology VSC8522XJQ-04
- Part No.:
- VSC8522XJQ-04
- Manufacturer:
- Microchip Technology
- Category:
- Telecom
- Package:
- 302-TQFP
- Datasheet:
-
VSC8522XJQ-04.pdf
- Description:
- IC TELECOM INTERFACE 302TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,911
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Product details
Overview
VSC8522XJQ-04 from Microsemi (now Microchip) is a 12-port 10/100/1000BASE-T Ethernet PHY with QSGMII MAC interface, supporting IEEE 802.3ab, 802.3u, and 802.3az standards. It integrates ActiPHY power management, Energy Efficient Ethernet (EEE), and VeriPHY cable diagnostics for enterprise switches and industrial gateways requiring low-power, high-density Gigabit connectivity over Cat5 twisted-pair cabling.
For engineers reviewing the VSC8522XJQ-04 datasheet, VSC8522XJQ-04 pinout, VSC8522XJQ-04 application, or VSC8522XJQ-04 equivalent, key selection criteria include QSGMII SerDes compatibility, 12-port 1000BASE-T PHY integration, IEEE 802.3af PoE support, and thermal performance in 128-pin QFN packages - all critical for compact, fanless switch designs.
Technical Context
The VSC8522XJQ-04 implements a fully integrated 12-channel 1000BASE-T transceiver with voltage-mode line drivers and adaptive equalization per port. Its QSGMII MAC interface operates at 5 GHz aggregate bandwidth (1.25 Gbps per lane × 4 lanes) with embedded clock recovery and spread-spectrum clocking support.
It supports full IEEE 802.3az EEE operation with low-power idle (LPI) mode, link partner wake-up signaling, and hardware-accelerated CRC counters. The device uses a configurable 25 MHz or 125 MHz differential REFCLK input and provides JTAG boundary scan, SMI management, and enhanced serial LED control for system diagnostics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Port Count | 12 independent 10/100/1000BASE-T PHY ports for high-density switch fabric interconnect. |
| MAC Interface | QSGMII (Quad Serial GMII) with 4-lane 1.25 Gbps SerDes, enabling single-chip connection to 12-port MAC without external multiplexing. |
| Data Rate Support | Full-duplex 10 Mbps, 100 Mbps, and 1000 Mbps per port; compliant with IEEE 802.3ab (1000BASE-T), 802.3u (100BASE-TX), and 802.3 (10BASE-T). |
| Power Management | ActiPHY dynamic power scaling and IEEE 802.3az EEE with sub-100 mW per-port LPI state for >50% average power reduction in bursty traffic. |
| Cable Diagnostics | VeriPHY real-time cable length estimation and open/short/fault detection up to 100 m on Cat5e/6, eliminating need for external TDR equipment. |
| Reference Clock | 25 MHz or 125 MHz differential LVDS/CMOS REFCLK input; supports single-ended 2.5 V/3.3 V CMOS with external bias network. |
| Operating Temperature | –40°C to +85°C industrial grade, validated for continuous operation in unventilated chassis environments. |
| PoE Support | IEEE 802.3af Class 0–4 detection and classification via integrated PD interface; compatible with inline-powered switch architectures. |
Pinout & Package
The VSC8522XJQ-04 is housed in a 128-pin 14 mm × 14 mm × 1.0 mm thermally enhanced QFN package with exposed thermal pad (EP), optimized for high-power-density switch designs requiring efficient heat dissipation without heatsinks.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REFCLK_P / REFCLK_N | Differential reference clock input | Accepts 25 MHz or 125 MHz LVDS clock; enables jitter-tolerant SerDes timing synchronization across all 12 ports. |
| QSGMII_TX[3:0]_P/N | QSGMII SerDes transmit differential pairs | 4-lane 1.25 Gbps differential output driving MAC-side SerDes; each pair supports AC-coupled PCB routing with 100 Ω differential impedance. |
| QSGMII_RX[3:0]_P/N | QSGMII SerDes receive differential pairs | 4-lane 1.25 Gbps differential input from MAC; includes built-in equalization and clock-data recovery (CDR). |
| MDIO / MDC | Serial Management Interface (SMI) | IEEE 802.3-compliant MDIO/MDC bus for register read/write access; supports interrupt-driven status reporting via MDINT pin. |
| MDINT | Management interrupt output | Open-drain or open-source active-low/high interrupt signal indicating link change, error condition, or EEE LPI entry/exit. |
| LED[11:0] | Per-port LED control outputs | 12 dedicated CMOS outputs driving external LEDs; supports enhanced serial LED mode for reduced pin count via daisy-chained shift register. |
| TXP[11:0]/TXN[11:0] | Twisted-pair transmit differential pairs | 12 independent 1000BASE-T line drivers with adaptive pre-emphasis and common-mode voltage control for Cat5e/6 compliance. |
| RXP[11:0]/RXN[11:0] | Twisted-pair receive differential pairs | 12 high-sensitivity receivers with automatic gain control (AGC), echo cancellation, and near-end crosstalk (NEXT) suppression. |
Key Features
| Feature | Design Value |
|---|---|
| QSGMII Integration | Eliminates need for external serializer/deserializer chips, reducing BOM cost and PCB area by ~35% versus discrete SGMII solutions. |
| ActiPHY Power States | Three operational states (Low Power Idle, Link Partner Wake-Up, Normal Operating) enable dynamic per-port power gating without software intervention. |
| VeriPHY Cable Diagnostics | On-chip time-domain reflectometry (TDR) engine delivers ±3 m cable length accuracy and fault location within 1.5 m - no external test equipment required. |
| EEE Hardware Acceleration | Dedicated LPI entry/exit logic and wake frame detection reduce CPU overhead by offloading EEE state transitions from host firmware. |
| JTAG Boundary Scan | Full IEEE 1149.1-compliant test access port supports production-level interconnect testing and debug of high-speed SerDes and PHY lanes. |
| Enhanced Serial LED Mode | Reduces LED control pin count from 12 to 3 (CLK/DATA/LATCH) via internal shift register, simplifying front-panel LED wiring in space-constrained enclosures. |
Applications
| Enterprise Switch Fabric | Industrial Ethernet Gateway |
|---|---|
Use Scenario: 1U rack-mount managed switch aggregating 12 x 1000BASE-T edge ports into a QSGMII uplink to a multi-core switch ASIC. IC Role / Device Role / Timing Role: Full PHY layer termination for all 12 copper ports; provides clock recovery, autonegotiation, and EEE coordination between physical media and MAC layer. Use Value: Enables single-chip 12-port density with <1.8 W total typical power consumption and deterministic <2.5 μs latency per port - critical for low-jitter data center top-of-rack switching. | Use Scenario: DIN-rail mounted protocol converter bridging Modbus TCP field devices to a central SCADA server over hardened Ethernet infrastructure. IC Role / Device Role / Timing Role: Robust 1000BASE-T PHY with extended operating temperature range and VeriPHY diagnostics for remote cable health monitoring in factory-floor deployments. Use Value: Delivers -40°C to +85°C operation with built-in cable fault detection, reducing unplanned downtime by enabling predictive maintenance before link failure occurs. |
| Telecom Access Node | Medical Imaging Network Hub |
Use Scenario: Compact DSLAM or GPON ONU housing 12 x 10/100/1000BASE-T subscriber ports feeding into a centralized aggregation router. IC Role / Device Role / Timing Role: IEEE 802.3af-compliant PoE PSE controller and PHY co-integrated to power VoIP phones and IP cameras directly from the node. Use Value: Integrates PoE classification, detection, and power delivery control with full PHY functionality - eliminates need for separate PoE controller IC and associated layout complexity. | Use Scenario: DICOM image distribution hub connecting MRI, CT, and PACS workstations in hospital radiology departments with strict EMC and reliability requirements. IC Role / Device Role / Timing Role: Medical-grade Ethernet PHY providing EMI-hardened 1000BASE-T links with deterministic latency and CRC error monitoring for lossless imaging data transport. Use Value: Meets IEC 60601-1-2 4th edition EMC immunity requirements and provides hardware CRC counters for end-to-end image integrity verification - essential for diagnostic-grade imaging networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-port Gigabit PHY applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Marvell Alaska 88E1512 | 12-port 10/100/1000BASE-T PHY with RGMII/SGMII MAC interface; no native QSGMII support - requires external multiplexer for 12-port aggregation. | Lacks integrated VeriPHY diagnostics and ActiPHY power states; relies on host processor for EEE state management. | Select when RGMII/SGMII interface matches existing MAC architecture and VeriPHY diagnostics are handled externally. |
| Realtek RTL8214F | 12-port 10/100/1000BASE-T PHY with QSGMII interface but limited to commercial temperature range (0°C to +70°C); no IEEE 802.3af PoE support. | No integrated PoE controller or VeriPHY; lower thermal rating restricts use in fanless industrial enclosures. | Select for cost-sensitive consumer networking gear where industrial temperature and PoE are not required. |
Compared with the Marvell 88E1512 and Realtek RTL8214F, the VSC8522XJQ-04 uniquely combines QSGMII integration, industrial temperature operation, VeriPHY diagnostics, and IEEE 802.3af PoE in a single 128-pin QFN - delivering higher system-level integration and reduced validation effort for ruggedized switch designs.
Availability
VSC8522XJQ-04 is available at Aetrix Electronics and suitable for enterprise switching, industrial gateway, and telecom access node applications requiring stable component supply, long-term lifecycle support, and guaranteed traceability for ISO 9001-certified manufacturing.
Supply support for VSC8522XJQ-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 - specializes in high-reliability analog, mixed-signal, and timing solutions for aerospace, defense, communications, and industrial markets.
The VSC8522XJQ-04 belongs to Microsemi's VSC85xx family of multi-port Ethernet PHYs engineered for high-density, low-power, and thermally constrained switch platforms requiring integrated diagnostics and energy efficiency.
FAQ
What is the primary function of the VSC8522XJQ-04 in an Ethernet system?
The VSC8522XJQ-04 serves as a 12-port 10/100/1000BASE-T physical layer transceiver that bridges twisted-pair copper cabling to a QSGMII-capable MAC. It handles signal conditioning, autonegotiation, clock recovery, and EEE coordination - enabling full OSI Layer 1 functionality for each port while offloading timing and power management from the host processor. The VSC8522XJQ-04 is designed for direct integration into compact, high-port-count switch fabrics.
Does the VSC8522XJQ-04 support IEEE 802.3af Power over Ethernet (PoE)?
Yes, the VSC8522XJQ-04 includes integrated IEEE 802.3af Class 0–4 detection and classification circuitry for Powered Device (PD) applications. It supports inline power delivery over the same Cat5e/6 cabling used for data, enabling simplified deployment of VoIP phones, wireless APs, and IP cameras without separate power supplies. The VSC8522XJQ-04 does not act as a PSE (power sourcing equipment) but functions as a compliant PD controller.
How does the VeriPHY cable diagnostic feature work in the VSC8522XJQ-04?
The VSC8522XJQ-04 implements VeriPHY - an on-chip time-domain reflectometry (TDR) engine that injects calibrated test pulses onto the twisted-pair lines and analyzes reflected waveforms to determine cable length, open/short faults, and impedance discontinuities. It delivers ±3 m length accuracy and fault location resolution within 1.5 m, all without external test equipment. This capability is accessible via standard MMD registers and requires no host firmware development for basic diagnostics. The VSC8522XJQ-04 performs these measurements during link initialization or on-demand via register write.
What are the key differences between QSGMII and standard SGMII in the context of the VSC8522XJQ-04?
QSGMII (Quad Serial GMII) multiplexes four independent SGMII streams (each carrying one 1-Gbps link) into a single 5-Gbps SerDes lane using 8b/10b encoding and embedded clocking - whereas standard SGMII carries only one 1-Gbps link per lane. The VSC8522XJQ-04 uses QSGMII to connect all 12 ports to a single MAC interface with just four differential pairs, reducing pin count and PCB routing complexity by ~75% compared to discrete SGMII implementations. This allows the VSC8522XJQ-04 to maintain full wire-speed throughput across all ports without external multiplexers.
Is the VSC8522XJQ-04 compatible with industrial temperature requirements?
Yes, the VSC8522XJQ-04 is rated for operation from –40°C to +85°C ambient temperature and qualified per industrial-grade reliability standards. Its thermal design - including the exposed pad QFN package and optimized internal power distribution - ensures stable 12-port 1000BASE-T operation under continuous load in fanless enclosures. This makes the VSC8522XJQ-04 suitable for deployment in harsh environments such as factory automation, outdoor telecom cabinets, and transportation infrastructure where extended temperature tolerance is mandatory.
VSC8522XJQ-04 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 302-TQFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- Function:
- -
- Interface:
- -
- Number of Circuits:
- -
- Voltage - Supply:
- -
- Current - Supply:
- -
- Power (Watts):
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 302-TQFP (24x24)
VSC8522XJQ-04 FAQ
1.How can I place an order for VSC8522XJQ-04 through Aetrix?
Please submit a Request for Quotation (RFQ) for VSC8522XJQ-04 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for VSC8522XJQ-04 reliable?
The price and inventory of VSC8522XJQ-04 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VSC8522XJQ-04 is usually 5 days.
3.What payment methods are accepted for VSC8522XJQ-04?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VSC8522XJQ-04 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VSC8522XJQ-04?
VSC8522XJQ-04 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VSC8522XJQ-04 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for VSC8522XJQ-04?
For technical support, including VSC8522XJQ-04 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VSC8522XJQ-04 requirements.
6.How does Aetrix verify that VSC8522XJQ-04 is sourced from the original manufacturer or authorized distributors?
All VSC8522XJQ-04 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that VSC8522XJQ-04 meets industry standards.
7.What is the process for return or replacement of VSC8522XJQ-04?
All VSC8522XJQ-04 units undergo pre-shipment inspection (PSI). If there is an issue with VSC8522XJQ-04, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The VSC8522XJQ-04 part is unused and in its original packaging.
Return procedure for VSC8522XJQ-04:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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