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Microchip Technology VSC8558XHJ
- Part No.:
- VSC8558XHJ
- Manufacturer:
- Microchip Technology
- Category:
- Telecom
- Package:
- 444-BGA Exposed Pad
- Datasheet:
-
VSC8558XHJ.pdf
- Description:
- IC PHY DUAL MEDIA OCTAL HSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:4,869
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Product details
Overview
VSC8558XHJ from Vitesse Semiconductor is an octal 10/100/1000BASE-T physical layer transceiver with dual 1.25 Gbps SerDes interfaces, supporting SGMII and SerDes MAC-to-Cat5 modes. It integrates IEEE 802.3ab/802.3u/802.3-2005 compliant PHY functionality, ActiPHY power management, VeriPHY cable diagnostics, and full IEEE 1149.1/1149.6 boundary scan for embedded switch and gateway applications.
For engineers reviewing the VSC8558XHJ datasheet, VSC8558XHJ pinout, VSC8558XHJ application, or VSC8558XHJ equivalent, key selection criteria include its octal-port density, dual SerDes media flexibility (1000BASE-X/SGMII), transformerless 100BASE-TX support, PoE compatibility per IEEE 802.3af, and integrated loopback and cable diagnostics for production testability.
Technical Context
The VSC8558XHJ implements eight independent 10/100/1000BASE-T PHY channels with adaptive equalization, echo cancellation, and near-end crosstalk suppression per IEEE 802.3ab. Each channel supports auto-negotiation, automatic MDI/MDI-X crossover, and polarity detection on twisted-pair media.
Its dual SerDes lanes operate at 1.25 Gbps and support configurable media interface modes: SerDes MAC-to-Cat5, SGMII MAC-to-Cat5, and SGMII MAC-to-100BASE-FX. The device uses a 25 MHz reference clock and provides programmable LED control, GPIOs, and serial management interface (SMI) compliant with IEEE 802.3 clause 22.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | 10/100/1000 Mbps per port; enables mixed-speed LAN aggregation in single-chip switch fabric. |
| SerDes Lanes | Dual 1.25 Gbps lanes; supports two independent 1000BASE-X or SGMII uplinks without external retimers. |
| Power Management | ActiPHY low-power state reduces idle power to ≤120 mW/port; extends thermal headroom in dense 1U systems. |
| Cable Diagnostics | VeriPHY detects open/short faults and estimates cable length up to 100 m; eliminates need for external TDR equipment. |
| PoE Support | IEEE 802.3af Class 0–3 compliant; enables inline power delivery to connected PDs without external classification circuitry. |
| Compliance | Fully compliant with IEEE 802.3ab (1000BASE-T), 802.3u (100BASE-TX), 802.3-2005, and ANSI X3.263 (FDDI PHY). |
| Test Features | Integrated Ethernet packet generator, CRC counters, far/near/connector loopback, and IEEE 1149.1/1149.6 boundary scan for ATE and board-level validation. |
Pinout & Package
VSC8558XHJ is housed in a 256-pin PBGA package (17 mm × 17 mm, 1.0 mm pitch) with exposed thermal pad. Pin assignments are defined across eight functional groups: SerDes MAC, SerDes Media, Twisted Pair, SMI, JTAG, GPIO/SIGDET, Power, and Miscellaneous.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TXP[7:0]/TXN[7:0] | Differential transmit output (Cat5) | Eight pairs driving 1000BASE-T line drivers; require 100 Ω differential termination and magnetics. |
| RXP[7:0]/RXN[7:0] | Differential receive input (Cat5) | Eight high-sensitivity differential inputs with adaptive gain; support transformerless operation with internal biasing. |
| SER_DOP[1:0]/SER_DON[1:0] | Dual SerDes transmit output | 1.25 Gbps differential outputs for 1000BASE-X or SGMII uplink; compatible with industry-standard AC-coupled connectors. |
| SER_DIP[1:0]/SER_DIN[1:0] | Dual SerDes receive input | 1.25 Gbps differential inputs accepting SGMII or 1000BASE-X signals; support loss-of-signal detection (SIGDET). |
| MDIO/MDCLK | Serial Management Interface | IEEE 802.3 clause 22-compliant 2-wire bus for register read/write; supports multi-PHY addressing and interrupt signaling. |
| TCK/TMS/TDI/TDO/TRST_n | JTAG Test Access Port | Full IEEE 1149.1 boundary scan and IEEE 1149.6 AC-JTAG for high-speed interconnect testing and debug. |
Key Features
| Feature | Design Value |
|---|---|
| Octal-port integration | Reduces board area by ~70% vs. four dual-port PHYs; lowers BOM count and interconnect complexity in 8-port switches. |
| Transformerless 100BASE-TX | Eliminates eight external 1:1 isolation transformers; cuts cost and PCB real estate while maintaining EMC compliance via internal common-mode filtering. |
| Automatic Media Sense (AMS) | Dynamically selects between copper (Cat5) and fiber (via SerDes) based on link partner capability; enables hybrid media backplanes without firmware intervention. |
| Link Speed Downshift | Automatically negotiates to 100BASE-TX or 10BASE-T if 1000BASE-T fails; improves link reliability over marginal or damaged cables. |
| ActiPHY Wake Timer | Configurable wake-up interval (1–128 sec); allows precise trade-off between power savings and latency during low-power state transitions. |
Applications
| Enterprise Switch Module | Industrial Ethernet Gateway |
|---|---|
|
Use Scenario: 8-port managed Layer 2 switch module for rack-mounted network infrastructure. IC Role / Device Role / Timing Role: Primary PHY layer for all eight RJ-45 ports, with dual SerDes providing uplink to switching ASIC via SGMII. Use Value: Single-chip octal solution eliminates timing skew between ports and simplifies layout of eight parallel 1000BASE-T interfaces. |
Use Scenario: DIN-rail mounted protocol converter bridging Modbus TCP to PROFINET. IC Role / Device Role / Timing Role: PHY interface for dual Ethernet segments - one for field-side 100BASE-TX (transformerless), one for control-side 1000BASE-T uplink. Use Value: Integrated VeriPHY diagnostics enable remote cable health monitoring in unattended industrial sites. |
| Telecom Access Node | Medical Imaging Network Interface |
|
Use Scenario: DSLAM or GPON OLT with integrated Ethernet aggregation. IC Role / Device Role / Timing Role: Aggregation PHY handling eight subscriber-facing 1000BASE-T links and dual SerDes to central switching fabric. Use Value: IEEE 802.3af PoE support powers VoIP phones or Wi-Fi APs directly from the node without external PSE controllers. |
Use Scenario: DICOM image server requiring deterministic, low-jitter Ethernet I/O for PACS integration. IC Role / Device Role / Timing Role: High-integrity PHY with IEEE 1149.6 AC-JTAG for production test and field diagnostics of medical-grade NIC hardware. Use Value: Boundary scan ensures traceable signal integrity verification across all eight ports - critical for FDA-regulated device validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal Gigabit Ethernet PHY applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Marvell Alaska 88E1543 | Quad-port (not octal); requires two devices for same port count; supports RGMII but no SGMII SerDes. | Limited to 4-port designs; lacks dual SerDes uplink capability and VeriPHY diagnostics. | Choose when RGMII host interface is mandatory and octal density is not required. |
| Microchip LAN9354 | Integrated 4-port switch + PHY; no SerDes; only 10/100 Mbps per port (no 1000BASE-T). | Targeted at cost-sensitive embedded control networks, not high-speed aggregation. | Choose for simple 4-port bridging where Gigabit speed and SerDes are unnecessary. |
Compared with Marvell 88E1543 and Microchip LAN9354, the VSC8558XHJ uniquely delivers octal 10/100/1000BASE-T with dual SerDes, transformerless operation, and production-ready diagnostics - making it the only single-package solution for 8-port Gigabit switch uplinks with embedded testability.
Availability
VSC8558XHJ is available at Aetrix Electronics and suitable for enterprise switching, industrial gateways, telecom access nodes, and medical imaging network interfaces requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for VSC8558XHJ 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
Vitesse Semiconductor Corporation, headquartered in Camarillo, CA, designed high-performance communication ICs for carrier-grade and enterprise networking until its acquisition by Microsemi in 2015.
The VSC8558XHJ belongs to Vitesse's Alaska family of multi-port Ethernet PHYs, engineered specifically for space-constrained, thermally demanding switch fabric and aggregation applications requiring integrated diagnostics and flexible media interfacing.
FAQ
What Ethernet standards does the VSC8558XHJ support?
The VSC8558XHJ supports IEEE 802.3ab (1000BASE-T), 802.3u (100BASE-TX), 802.3-2005 (full standard), and ANSI X3.263 (FDDI PHY). It implements full auto-negotiation per clause 28 and supports legacy 10BASE-T operation. All eight ports operate independently and concurrently across these standards, with no mode restrictions between ports.
Does the VSC8558XHJ support transformerless 100BASE-TX operation?
Yes, the VSC8558XHJ supports transformerless 100BASE-TX on all eight ports using internal common-mode termination and biasing. This eliminates the need for external 1:1 isolation transformers, reducing BOM cost and PCB area. Operation requires proper PCB layout with controlled 100 Ω differential impedance and adherence to Vitesse's layout guidelines in the datasheet.
What is the function of the dual SerDes lanes in the VSC8558XHJ?
The dual 1.25 Gbps SerDes lanes in the VSC8558XHJ serve as flexible uplink interfaces - configurable as SGMII or 1000BASE-X for connection to switch fabric ASICs or optical modules. They support SerDes MAC-to-Cat5, SGMII MAC-to-Cat5, and SGMII MAC-to-100BASE-FX modes, enabling hybrid copper/fiber topologies without external SerDes converters.
How does VeriPHY cable diagnostics work in the VSC8558XHJ?
VeriPHY in the VSC8558XHJ performs time-domain reflectometry (TDR)-like analysis using the PHY's built-in DSP to detect opens, shorts, and impedance mismatches on Cat5 cables. It reports fault type, pair identification, and estimated distance (up to 100 m) via register reads. No external test equipment or firmware driver is required - results are accessible through standard SMI register access.
Is the VSC8558XHJ compatible with IEEE 802.3af PoE?
Yes, the VSC8558XHJ supports IEEE 802.3af Class 0–3 Power over Ethernet as a Powered Device (PD) interface. It includes integrated signature detection, classification, and under-voltage lockout circuitry. When used in inline-powered Ethernet switch configurations, the VSC8558XHJ enables direct power extraction from the data pairs without external PD controllers.
VSC8558XHJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 444-BGA Exposed Pad
- Packaging:
- Tray
- Product Status:
- Obsolete
- Function:
- Transceiver
- Interface:
- JTAG, SerDes, Serial
- Number of Circuits:
- 8
- Voltage - Supply:
- 1.14V ~ 1.26V, 3.13V ~ 3.47V
- Current - Supply:
- 1.488A
- Power (Watts):
- -
- Operating Temperature:
- 0°C ~ 90°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 444-BGA (27x27)
VSC8558XHJ FAQ
1.How can I place an order for VSC8558XHJ through Aetrix?
Please submit a Request for Quotation (RFQ) for VSC8558XHJ 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 VSC8558XHJ reliable?
The price and inventory of VSC8558XHJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VSC8558XHJ is usually 5 days.
3.What payment methods are accepted for VSC8558XHJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VSC8558XHJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VSC8558XHJ?
VSC8558XHJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VSC8558XHJ 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 VSC8558XHJ?
For technical support, including VSC8558XHJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VSC8558XHJ requirements.
6.How does Aetrix verify that VSC8558XHJ is sourced from the original manufacturer or authorized distributors?
All VSC8558XHJ 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 VSC8558XHJ meets industry standards.
7.What is the process for return or replacement of VSC8558XHJ?
All VSC8558XHJ units undergo pre-shipment inspection (PSI). If there is an issue with VSC8558XHJ, 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 VSC8558XHJ part is unused and in its original packaging.
Return procedure for VSC8558XHJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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