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Renesas QLX4600SIQSR
- Part No.:
- QLX4600SIQSR
- Manufacturer:
- Renesas
- Category:
- Specialized
- Package:
- 46-WFQFN Exposed Pad
- Datasheet:
-
QLX4600SIQSR.pdf
- Description:
- IC INTERFACE SPECIALIZED 46TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
QLX4600SIQSR from Renesas (formerly Intersil) is a quad-channel, receive-side CML equalizer IC designed for high-speed serial interconnects. It delivers up to 30 dB of programmable equalization across four independent lanes, supports line rates up to 6.25 Gb/s, operates on a single 1.2 V supply, and extends signal reach to 30 m over 24 AWG twin-axial cable-enabling DisplayPort v1.2 active cables and PCIe Gen 2 backplane links.
For engineers reviewing the QLX4600SIQSR datasheet, QLX4600SIQSR pinout, QLX4600SIQSR application, or QLX4600SIQSR equivalent, this page provides verified technical context, validated pin functions, confirmed protocol support (DisplayPort v1.2, InfiniBand SDR/DDR, PCI Express Gen 1/2), and real-world equalization performance metrics-including 0.25 UI residual jitter at 6.25 Gb/s over 15 m of 28 AWG cable.
Technical Context
The QLX4600SIQSR implements four independent Current Mode Logic (CML) receive channels, each with a fixed-gain adjustable equalizer followed by a limiting amplifier. Its architecture preserves line silence via DT-pin–controlled amplitude threshold detection and supports dual-mode boost configuration: 18 levels via CMOS control pins (CP[k][A,B,C]) or full 32-level resolution via 21-register serial bus (DI/DO/CLK/ENB).
Each channel features per-lane power-down via dedicated IS[k] pins (IS1–IS4), enabling dynamic channel disablement in PCIe Fundamental Reset sequences. Input impedance switches between 50 Ω (active) and >200 kΩ (powered-down), and output common-mode voltage remains stable during muting-critical for InfiniBand quiescent-state compliance and SAS OOB signaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Data Rate | Up to 6.25 Gb/s NRZ-supports full DisplayPort HBR2, PCIe Gen 2, and 10GBase-CX4 link speeds. |
| Equalization Range | 32 programmable boost levels (serial mode) or 18 levels (pin mode)-enables precise compensation for varying cable loss profiles (e.g., −25 dB @ 2.5 GHz on 20 m 24 AWG). |
| Power Consumption | 78 mW per channel (312 mW total)-achieved with 1.2 V supply and optimized CML I/O, reducing thermal load in dense cable assemblies. |
| Propagation Delay | 500 ps max from IN[k] to OUT[k]-ensures deterministic timing for multi-lane alignment in XAUI/RXAUI and SAS-2 applications. |
| Residual Jitter | 0.25 UI typical at 6.25 Gb/s over 15 m 28 AWG cable-meets BER <1e−12 requirements for high-reliability active interconnects. |
| Input Return Loss | ≥10 dB differential (50 MHz–3.75 GHz)-minimizes reflections on lossy PCB traces and long copper cables. |
| Output Amplitude | 450–650 mVP-P differential into 50 Ω-provides robust signal swing for downstream CDR receivers without additional amplification. |
Pinout & Package
QLX4600SIQSR is housed in a RoHS-compliant 46-lead TQFN package (4 mm × 7 mm, 0.4 mm pitch) with exposed thermal pad. The package supports high-density routing in active cable modules and board-edge applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN1[P], IN1[N]–IN4[P], IN4[N] | Differential CML inputs (4 channels) | Accept attenuated high-speed signals; require 100 nF low-ESL/ESR MLCC AC coupling; DC input resistance = 100 Ω typical. |
| OUT1[P], OUT1[N]–OUT4[P], OUT4[N] | Differential CML outputs (4 channels) | Deliver boosted, low-jitter signals; output swing = 450–650 mVP-P; differential impedance = 105 Ω typical. |
| IS1–IS4 | CMOS channel power-down controls | Pull LOW to disable channel (input Z >200 kΩ, current draw drops from 50 mA to 3.8 mA); used for PCIe Fundamental Reset synchronization. |
| CP1[A,B,C]–CP4[A,B,C] | 3-bit CMOS boost level select (per channel) | Set 18 discrete equalization levels per channel via resistor-divided logic; internally pulled down (25 kΩ). |
| DI, DO, CLK, ENB | Serial programming interface | 21-register bus (DI/CLK/ENB) configures all 32 boost levels per channel; DO provides register readback with 21-cycle delay. |
| DT | Detection Threshold reference | Sets LOS activation threshold via external current; tie to GND to disable line-silence preservation and force continuous output. |
| VDD (pins 4,7,10,29,32,35) | 1.2 V power supply | Six dedicated supply pins require local 100 pF + 10 nF decoupling each for broadband noise suppression up to 4 GHz. |
| EXPOSED PAD | Thermal and electrical ground | Mandatory connection to PCB ground plane for thermal dissipation (θJC = 2.3°C/W) and signal integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Quad-channel lane extension | Four independent equalizers in one 4×7 mm TQFN-enables straight-through routing in active copper cable assemblies with minimal trace length mismatch. |
| Line silence preservation | Detects low-amplitude periods (e.g., InfiniBand quiescent state) via DT-pin threshold and mutes outputs while holding common-mode voltage-prevents protocol corruption. |
| Per-channel power-down | Individual IS[k] control reduces idle power by >92% per disabled channel-critical for PCIe hot-plug and ATCA E-keying compliance. |
| Dual-mode equalization control | Hardware pin-select (18 levels) or serial register programming (32 levels)-supports both fixed-configuration modules and field-upgradable systems. |
| Low-latency signal restoration | 500 ps propagation delay and <500 ps latency-preserves timing margins in multi-gigabit backplanes and high-speed PCB traces. |
Applications
| DisplayPort v1.2 Active Cables | InfiniBand SDR/DDR Interconnects |
|---|---|
Use Scenario: Extending DisplayPort video links beyond passive cable limits using 24–30 AWG twin-axial assemblies. IC Role / Device Role / Timing Role: Receive-side equalizer restoring high-frequency content lost over copper; maintains HBR2 eye opening at 5.4 Gb/s per lane. Use Value: Enables thinner, longer (up to 30 m), and lower-cost active cables without sacrificing EDID handshake reliability or AUX channel integrity. |
Use Scenario: Maintaining signal integrity across InfiniBand switch-to-server links using standard twin-axial cabling. IC Role / Device Role / Timing Role: Quad-lane extender preserving line-silence signaling during link training and power management states. Use Value: Prevents false link-down assertions caused by equalizer-induced noise during quiescent periods-ensuring protocol-level stability. |
| PCI Express Gen 1/2 Backplanes | SAS-2 (6 Gb/s) Storage Interconnects |
Use Scenario: Compensating for FR4 trace loss in midplane or mezzanine card interconnects operating at 2.5/5 Gb/s. IC Role / Device Role / Timing Role: Per-lane equalizer with IS[k]-controlled power-down synchronized to PCIe Fundamental Reset. Use Value: Eliminates need for external reset sequencing logic; enables hot-plug-ready designs with sub-100 µs link recovery. |
Use Scenario: Boosting SAS-2 signals across 20+ meter twin-axial storage enclosures with OOB (out-of-band) signaling. IC Role / Device Role / Timing Role: Equalizer supporting precise tDS/tSD timing (≤5 ns skew) for ALIGN(0) sequence detection during SAS discovery. Use Value: Guarantees reliable domain validation and expander initialization even under marginal cable loss conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-channel receive equalizer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL36411 | Higher data rate (11 Gb/s), 30 dB equalization, but no line-silence preservation or IS[k] power-down pins. | Targeted at DP1.3/40GbE QSFP+ modules-not suitable for PCIe or InfiniBand where quiescent-state fidelity is required. | Select ISL36411 only when maximum bandwidth and density outweigh protocol-aware features. |
| QLX4600-SL30 | Same core architecture and 6.25 Gb/s capability, but uses 4-pin LOS detection instead of impedance-select power-down (IS[k]). | Optimized for SAS-6Gb and PCIe 2.0 where loss-of-signal assertion timing is prioritized over per-lane reset control. | Choose QLX4600-SL30 if system design relies on hardware LOS monitoring rather than software-controlled channel disable. |
Compared with ISL36411 and QLX4600-SL30, the QLX4600SIQSR uniquely balances protocol-aware operation (line silence preservation, IS[k]-driven power-down) with flexible equalization control-making it the only option among the three that fully supports PCIe Fundamental Reset, InfiniBand quiescent state, and SAS OOB timing constraints in a single device.
Availability
QLX4600SIQSR is available at Aetrix Electronics and suitable for DisplayPort active cable modules, InfiniBand interconnects, and PCIe Gen 2 backplane designs requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for QLX4600SIQSR 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
Renesas Electronics Corporation (acquired Intersil in 2017) is a global semiconductor leader specializing in analog, mixed-signal, and power management ICs for infrastructure, automotive, and industrial markets.
The QLX4600SIQSR belongs to Renesas' high-speed interconnect portfolio, engineered specifically for active copper cable and backplane applications demanding deterministic equalization, ultra-low latency, and multi-protocol signal integrity preservation.
FAQ
What is the maximum supported cable length for QLX4600SIQSR at 6.25 Gb/s?
The QLX4600SIQSR extends signal reach up to 15 m over 28 AWG twin-axial cable at 6.25 Gb/s, as validated in Figure 14 of the FN6979 datasheet. At lower data rates (e.g., 5 Gb/s), it achieves up to 30 m on 24 AWG cable-leveraging its 30 dB equalization range to compensate for frequency-dependent attenuation.
Does QLX4600SIQSR support both pin-based and serial programming of equalization settings?
Yes, QLX4600SIQSR supports dual-mode configuration: 18 equalization levels per channel via CMOS control pins (CP[k][A,B,C]), or full 32-level resolution via its 21-register serial interface (DI/DO/CLK/ENB). Serial mode overrides pin settings when MODE pin is HIGH, and default boot behavior uses pin settings unless registers are explicitly programmed.
How does QLX4600SIQSR preserve line silence for InfiniBand and SAS protocols?
QLX4600SIQSR preserves line silence by detecting low-amplitude input signals via the DT pin threshold and muting the output driver while maintaining constant common-mode voltage. This prevents spurious transitions during InfiniBand quiescent states and ensures accurate SAS OOB ALIGN(0) detection-verified by tDS/tSD timing specs of ≤20 ns.
What is the power consumption of QLX4600SIQSR per channel, and how does channel power-down affect it?
QLX4600SIQSR consumes 78 mW per active channel (312 mW total). When a channel is powered down via its IS[k] pin, current draw drops from 50 mA to 3.8 mA-reducing per-channel power to ~4.6 mW. This enables dynamic power scaling in PCIe Gen 2 systems during link training or low-power states.
Is QLX4600SIQSR compatible with PCIe Gen 2 Fundamental Reset signaling?
Yes, QLX4600SIQSR is explicitly designed for PCIe Gen 2 compatibility: its IS[k] pins accept Fundamental Reset signals to simultaneously power down input stages and raise single-ended input impedance above 200 kΩ-enabling receiver detection and link initialization per PCIe Base Spec 2.0 Section 4.2.3.
QLX4600SIQSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- QLx™
- Package/Case:
- 46-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Copper Cable Modules
- Interface:
- -
- Voltage - Supply:
- 1.1V ~ 1.3V
- Supplier Device Package:
- 46-TQFN (4x7)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
QLX4600SIQSR FAQ
1.How can I place an order for QLX4600SIQSR through Aetrix?
Please submit a Request for Quotation (RFQ) for QLX4600SIQSR 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 QLX4600SIQSR reliable?
The price and inventory of QLX4600SIQSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for QLX4600SIQSR is usually 5 days.
3.What payment methods are accepted for QLX4600SIQSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for QLX4600SIQSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for QLX4600SIQSR?
QLX4600SIQSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your QLX4600SIQSR 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 QLX4600SIQSR?
For technical support, including QLX4600SIQSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your QLX4600SIQSR requirements.
6.How does Aetrix verify that QLX4600SIQSR is sourced from the original manufacturer or authorized distributors?
All QLX4600SIQSR 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 QLX4600SIQSR meets industry standards.
7.What is the process for return or replacement of QLX4600SIQSR?
All QLX4600SIQSR units undergo pre-shipment inspection (PSI). If there is an issue with QLX4600SIQSR, 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 QLX4600SIQSR part is unused and in its original packaging.
Return procedure for QLX4600SIQSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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